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In this work, copper sulfide particles are synthesized with different Co doping concentrations such as 0, 1 and 5% at 80 °C by optimizing synthesis times from 1 to 3 h. Copper sulfide particles possess two structural phases of covellite CuS and digenite Cu9S5. The increase in synthesis time from 1 to 3 h increases the Cu9S5 phase growth and changes the morphology from flower to microsphere. The CuS synthesized with 0, 1 and 5% Co dopant concentrations demonstrate flower consisting of agglomerated nanosheets, microsphere and flower like microsphere. The elemental investigation substantiates Co ions presence in CuS microspheres. The A1g (LO) mode intensity is decreased with increase in Co dopant concentration confirming Co incorporation into CuS microsphere. The CuS synthesized with 0, 1, 5% Co dopants exhibit 322 mV, 305 mV and 289 mV to attain 100 mA/cm2 in 1 M KOH seawater. The CuS synthesized with 5% Co dopant demonstrates higher double layer capacitance (Cdl) of 173.9 mFcm−2 and lower charge transfer resistance (Rct) of 6.07 Ω with 78.84% retention after 10 h continuous stability than that of the other pristine (118.3 mFcm−2, 13.72 Ω) and 1% Co doped CuS microsphere (165.7 mFcm−2, 8.55 Ω) indicating more surface active site and rapid charge carrier transport, respectively.

Metal chalcogenides have been intensively investigated as antibacterial agents due to their unique structures and superior photoactivities. Herein, various structures of copper sulfide (CuS), a metal chalcogenide, such as microspheres (MSs), nanosheets (NSs), and nanoparticles (NPs), were developed in this work for antibacterial applications. A hydrothermal process was utilized to synthesize CuS MSs, CuS NSs, and CuS NPs. Under simulated solar light and near-infrared (NIR) light irradiation, the antibacterial behaviors, reactive oxygen species (ROS) production, and light-driven antibacterial mechanisms of CuS MSs, CuS NSs, and CuS NPs were demonstrated with the bacterium Escherichia coli (E. coli). Bacterial growth curves and ROS generation tests indicated that CuS NSs and CuS NPs had higher light-driven antibacterial activities than that of CuS MSs. ROS of hydroxyl (·OH) and superoxide anion radicals (O2-) were investigated via an electron spin resonance (ESR) spectroscopic analysis by respectively incubating CuS MSs, CuS NSs, and CuS NPs with E. coli under simulated solar light irradiation. Furthermore, E. coli incubated with CuS NPs and CuS NSs showed substantial bacterial degradation after NIR laser irradiation, which was attributed to their photothermal killing effects. Light-driven antibacterial mechanisms of CuS NSs and CuS NPs were investigated, and we discovered that under simulated solar and NIR light irradiation, CuS NSs and CuS NPs produced photoinduced electrons, and the copper ions and photoinduced electrons then reacted with atmospheric moisture to produce hydroxide and superoxide anion radicals and heat, resulting in bacterial mortality.

Harmful bacterial flourish with the increase in environmental pollution and pose a great threat to human health. Thus, developing new and efficient antibacterial materials is imperative to reduce the pollution caused by traditional sterilization materials and improve sterilization efficiency. In this study, a new photocatalytic antibacterial material was developed to achieve an efficient antibacterial effect. Ti3C2Tx@CuS composites were synthesized by simple hydrothermal method, by which copper sulfide (CuS) nanoparticles were anchored on the surface of Ti3C2Tx to sharply improve the photocatalytic its antibacterial ability. Ti3C2Tx@CuS exhibits excellent antibacterial activity against Escherichia coli and Staphylococcus aureus with bactericidal rates of 99.6% and 99.1%, respectively. Photoluminescence spectroscopy (PL), decay time PL, photocurrent test, electrochemical impedance spectroscopy and finite element method showed that the formation of Ti3C2Tx@CuS heterojunction promoted the separation of electrons and holes, improved the electron transport efficiency, and elevated the generation of reactive oxygen species. Moreover, Ti3C2Tx@CuS has a stronger photothermal effect and causes more heat release than CuS to improve antibacterial performance. The Ti3C2Tx@CuS heterojunction has a broad application prospect in the disinfection and antibacterial fields.

Copper sulfide nanoparticles represent a class of dual-functional materials whose optical properties are dominated by interband electronic transitions and intraband plasmon resonances, both of whic...

Kesterite Cu2ZnSnS4 (k-CZTS) nanocrystals have received attention for their tunable optoelectronic properties, as well as the earth abundance of their constituent atoms. However, the phase-pure synthesis of these quaternary NCs is challenging due to their polymorphism, as well as the undesired formation of related binary and ternary impurities. A general synthetic route to tackle this complexity is to pass through intermediate template nanocrystals that direct subsequent cation exchange toward the desired quaternary crystalline phase, particularly those that are thermodynamically disfavored or otherwise synthetically challenging. Here, working within this model multinary system, we achieve control over the formation of three binary copper sulfide polymorphs, cubic digenite (Cu1.8S), hexagonal covellite (CuS), and monoclinic djurleite (Cu1.94S). Controlled experiments with Cu0 seeds show that selected binary phases can be favored by the identity and stoichiometry of the sulfur precursor alone under otherwise comparable reaction conditions. We then demonstrate that the nature of the Cu2-xS template dictates the final polymorph of the CZTS nanocrystal products. Through digenite, the cation exchange reaction readily yields the k-CZTS phase due to its highly similar anion sublattice. Covellite nanocrystals template the k-CZTS phase but via major structural rearrangement to digenite that requires elevated temperatures in the absence of a strong reducing agent. In contrast, we show that independently synthesized djurleite nanorods template the formation of the wurtzite polymorph (w-CZTS) but with prominent stacking faults in the final product. Applying this refined understanding to the standard one-pot syntheses of k- and w-CZTS nanocrystals, we identify that these reactions are each effectively templated by binary intermediates formed in situ, harnessing their properties to guide the overall synthesis of phase-pure quaternary materials. Our results provide tools for the careful development of tailored nanocrystal syntheses in complex polymorphic systems.

Copper sulfide (CuxS) as a plasmonic solar photothermal semiconductor material that expands the light collection range by altering localized surface plasmon resonance (LSPR) to the near- to mid- infrared (IR) spectral region. The versatile synthesis strategies of CuxS nanostructure offer its variability of morphology and provide additional freedom in tuning the optical property. Particularly, nanocage (or nanoshell) has hybridized plasmon resonances as a result of super-positioned nanosphere and nanocavity, which extends its receiving range of solar spectrum and increases light-to-heat conversion rate. Here, we offer novel “nanoink” and “nanofilm” developed from colloidal Cu27S24 nanocages with excellent solar photothermal response. Via combining experimental measurement and theoretical calculation, we estimated the optical properties of covellite Cu27S24. And based on obtained dielectric functions, we then calculated its solar photothermal performance, which was further validated by our experimental measurement. The simulation results showed that hollow Cu27S24 nanocages have excellent solar photothermal performance, and exhibit much higher solar photothermal conversion efficiency than solid Cu27S24 nanospheres.

In this paper, the leaching of a sulfide concentrate, from “Sarcheshmeh Copper Complex”, by sulfuric acid is studied. The influences of sulfuric acid concentration and leaching temperature were scrutinized to optimize the processing parameters and to disclose the kinetics of the extraction process. The leaching rate of copper was not significantly improved with enhancing the temperature and concentration of sulfuric acid. The formation of elemental sulfur was found as a reducer of the leaching rate. Only ~70% of copper was extracted by adding 1M ferric sulfate as the oxidant agent, as well as increasing the leaching temperature up to 85 °C. By leaching the mechanically activated concentrate in Fe2(SO4)3-doped H2SO4 at 85 °C, the amount of extracted copper was ~90% after 180 min. The experimental results were excellently fitted with the diffusion-controlled kinetic model as the activation energy of ~27 kJ/mol was estimated.

High electrical conductivity and superior redox properties of metal sulfide-based supercapacitors have attracted much attention in recent years. The simple and cost-effective method in the fabrication of high-performance supercapacitors is currently in high demand. In this paper, low-cost one-dimensional copper sulfide (Cu2S) electrodes are synthesized on glass as well as on flexible substrates such as polyethylene terephthalate (PET) and polypropylene (PP). The effect of the deposition quantity of Cu2S-1:1 on the glass substrate is also discussed. The synthesis of copper sulfide was done at room temperature by reducing copper sulphate pentahydrate using ascorbic acid as a reducing agent in sodium thiosulphate with 2 h of total reaction time. Scanning electron microscopy and x-ray diffraction characterizations are performed to validate the formation of Cu2S hollow rods. Electrochemical measurements such as cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy are performed using a Metrohm Autolab workstation. Cyclic voltammetry is performed to measure the capacitance of Cu2S-based supercapacitors in which the ratio of copper sulphate and sodium thiosulphate was varied from 1:0.5 to 1:1.5 with a step size of 0.5, and the deposition quantity of Cu2S-1:1 film was also varied on glass substrate from 1 mg to 2 mg. The results show that the device with a 1:1 ratio shows the highest capacitance, i.e., 587 mF/cm2 as compared to the devices fabricated with a 1:0.5 ratio, 1:1.5 ratio, and 1:1 ratio with greater deposition. This is mainly because the 1:1 ratio has less resistance and has a hollow rod structure which allows the electrolyte ions to penetrate in Cu2S active material and thus, facilitates fast electron transport resulting in high-performance supercapacitors. Further, to understand the increased capacitive properties of a copper sulfide-based supercapacitor, processes involving charge transfer and mass transport are investigated by performing electrochemical impedance spectroscopy (EIS). The radius on the EIS plot of Cu2S-1:1 is smaller as compared to the other three samples on the glass substrate. Also, the resistance of Cu2S-1:1 with greater deposition is more than the Cu2S-1:1 sample because the increased amount of electrode material leads to increased paths for the electrolyte ions to interact with the electrode material. Further, this paper also discusses the successful fabrication of the supercapacitor devices on flexible PP substrate using 1-D Cu2S for the first time. The results show that the capacitance value on the flexible substrate is on par with that of glass substrates. Also, the synthesized copper sulfide 1:1 sample exhibits excellent stability with the capacitance retention of 85.7%, 91.1%, 86.18%, and 92.8%, respectively, on PP, glass, PET, and Cu2S-1:1 with more deposition on glass substrate after 3500 cycles.

Copper sulfide (CuS) rod shaped nanostructures with an average length 8 to 10 nm are synthesized through green chemical route using biodegradable starch as a capping agent under a nitrogen environment. Owing to the presence of a large number of glucose units linked by glycosidic bonds, starch can cap copper sulfide (CuS) nanoparticles. The preparation of CuS under nitrogen atmosphere produces fine quality CuS nanostructures by minimizing oxidation. XRD pattern reveals pure hexagonal covellite type CuS nanostructure with prime diffraction planes along (101), (102), (103), (006), (008), and (110) directions. The lattice parameters estimated as a = 3.790 A and c = 16.51 A. HRTEM studies show a well distribution of CuS nanorods. It shows prominent d-value of 0.28 nm corresponding to (103) hexagonal plane of CuS. The optical absorption extended up to 364 nm which is fairly blue shifted over bulk owing to the quantum confinement brought by starch. The photoluminescence emission is observed at 525 nm. The I–V measurements in planar geometry exhibit the linearity that reveals the ohmic behavior of carrier transport in CuS nanostructures. CuS nanostructures have been successfully used as effective p-type layer to fabricate sandwiched heterojunction devices with zinc chalcogenides (ZnO/ZnS and ZnS/ZnO) core/shell nanocomposites. The p-CuS/n-(zinc chalcogenides) heterojunction devices show good diode characteristics with an increase of ideality factor that may be attributed to surface defects and inhomogeneity in the barrier height. The photodetector also exhibits promising characteristics in terms of responsivity and quantum efficiency which are significant corresponding to material properties.

In this work, gallium doped copper sulfide (Ga-doped CuS) nanocrystals were prepared using a solvothermal method. The effects of Ga doping on the crystal structures, chemical composition, morphology, optical properties and thermal performance of copper sulfide (CuS) were investigated. The Ga-doped CuS nanocrystals had a hexagonal structure comparable to that of pure CuS. The Cu+/Cu2+ ratio first decreased and then increased with increasing Ga3+ doping. Both CuS and Ga-doped CuS exhibited nanoplate and nanorod morphologies. The visible transmittance of the Ga-doped CuS films was in the range of 61–77.1%. Importantly, the near-infrared (NIR) shielding performance of the films can be tuned by adjusting the concentration of the Ga dopant. The NIR shielding value of the optimal Ga-doped CuS film was 72.4%, which was approximately 1.5 times as high as that of the pure CuS film. This can be ascribed to the enhanced plasmonic NIR absorption that resulted from an increase in the hole concentration after doping with Ga3+ ions. In the thermal performance test, the Ga-doped CuS film lowered the interior temperature of the heat box by 9.1 °C. Therefore, the integration of good visible transmittance and high NIR shielding performance make the Ga-doped CuS nanocrystals a promising candidate for energy-efficient window coatings.

Chemistry - a European journal 27(55), 13774 - 13782 (2021). doi:10.1002/chem.202101818, Owing to their high specific capacity and abundant reserve, Cu$_x$S compounds are promising electrode materials for lithium-ion batteries (LIBs). Carbon compositing could stabilize the Cu$_x$S structure and repress capacity fading during the electrochemical cycling, but the corresponding Li$^+$ storage mechanism and stabilization effect should be further clarified. In this study, nanoscale Cu$_2$S was synthesized by CuS co-precipitation and thermal reduction with polyelectrolytes. High-temperature synchrotron radiation diffraction was used to monitor the thermal reduction process. During the first cycle, the conversion mechanism upon lithium storage in the Cu2S/carbon was elucidated by operando synchrotron radiation diffraction and in situ X-ray absorption spectroscopy. The N-doped carbon-composited Cu$_2$S (Cu$_2$S/C) exhibits an initial discharge capacity of 425 mAh g$^{���1}$ at 0.1 A g$^{���1}$, with a higher, long-term capacity of 523 mAh g$^{���1}$ at 0.1 A g$^{���1}$ after 200 cycles; in contrast, the bare CuS electrode exhibits 123 mAh g$^{���1}$ after 200 cycles. Multiple-scan cyclic voltammetry proves that extra Li$^+$ storage can mainly be ascribed to the contribution of the capacitive storage., Published by Wiley-VCH, Weinheim

The flowerlike copper sulfide (CuS)/reduced graphene oxide (rGO) composites were prepared successfully by the hydrothermal method. The active anodic material was characterized by Raman spectroscopy, thermogravimetric analyses (TGA), transmission electron microscopy (TEM), and electrochemical techniques. TEM images showed that the flowerlike CuS is well combined with rGO. The electrochemical tests indicate that the presence of rGO improves the electrochemical performance of the CuS, achieving an initial high discharge capacity of 3401 mAh g−1 and initial charge capacity of 1064 mAh g−1, superior to that exhibited for pure CuS (765.2 mAh g−1 and 318.9 mAh g−1). The reason for this is that the addition of rGO increases the surface area and conductivity of the material. The changes enable the composite material more effectively to adapt to the severe volume changes during charging and discharging.

Cu2S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu2S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu2-xS with tunable phase compositions. With reduction in the CuCl/Na2S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu2S into Cu2S-Cu1.96S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na2S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na2S precursor ratio obtains a power factor of 8.04 μW cm-1 K-2 at 815 K, which is ∼735% of the value obtained by stoichiometric Cu2S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a ∼250% increase when compared to stoichiometric Cu2S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solution-synthesized Cu2S-based materials by phase tuning.

High charge transfer resistance and low electrocatalytic activity of counter electrodes (CEs) are mainly responsible for the poor photovoltaic performance of quantum-dot-sensitized solar cells (QDSSCs). Herein, a novel strategy has been successfully introduced for the first time to improve the electrocatalytic activity and charge transfer properties of a copper sulfide (CuS) CE by modifying it with the addition of hydrohalic acids (HHA). Through the suitable surface modification of HHA-incorporated CuS CE, the charge transfer from the external circuit to the CE surface was effectively facilitated. The electrochemical analyses suggest that charge transfer resistance is sufficiently reduced at the CE/electrolyte interface by using the HHA-treated CuS CEs. This improvement is mainly attributed to the high electrocatalytic activity of the modified CEs for the reduction of the polysulfide redox couple electrolyte in QDSSCs. The device constructed with TiO2/CdS/CdSe/ZnS photoanodes and the hydrogen-fluoride-treated CuS (HFCuS) CE exhibits a power conversion efficiency of 4.25%, which is considerably higher than that of the device with the bare CuS CE (3.11%). These findings can facilitate the fabrication of highly efficient CEs for next-generation solar cells.

Recently, potassium-ion batteries (PIBs) have been deemed to be a potential next-generation energy storage system for large-scale application because of the similar metal-ion storage mechanism as lithium-ion batteries and rich potassium resources. However, the large-sized potassium ion will cause sluggish reaction kinetics of K+ during charge/discharge processes, hindering the development of high-performance PIBs. In this work, copper sulfide embedded in three-dimensional ordered macroporous carbon framework (3DOM Cu9S5@C) was prepared through a sulfidation and subsequent ion exchange strategy with 3D ordered macropore Zn-based metal-organic frameworks as a precursor for an advanced PIBs anode. In particular, the interconnected 3D ordered macroporous structure can provide rapid transport channels for the large potassium ions and create a sufficient contact area for solid electrode materials and the liquid electrolyte, which is conducive to improve the ionic diffusion kinetics of batteries. Consequently, when the prepared 3DOM Cu9S5@C composite was used as a PIBs anode material, it shows a remarkable potassium storage rate capacity of 170 mA h g-1 at 2.0 A g-1 and an excellent cycling stability of 316 mA h g-1 at 100 mA g-1 after 200 cycles.

Covellite copper sulfide (CuS) thin films are deposited on soda–lime substrate using co-evaporation method at different substrate temperatures (150–300 °C). We investigated temperature-dependent properties such as structural, morphological, compositional, optical, and electrical properties of CuS thin films. The polycrystalline nature with orthorhombic structure of covellite CuS thin films is examined by X-ray diffraction (X-ray). The Raman analysis confirms the covellite CuS thin films without any other phases. Temperature dependence of morphology and elemental compositional of the films were carried out using scanning electron microscopy (SEM). The average grain size and surface roughness of the films examine using atomic force microscopy (AFM). The reduction in the direct energy band gap (2.49–2.32 eV) can be correlated to the quantum confinement. Hall results confirm that all the films are having p-type conductivity with lower resistivity in the range of 10−4 Ω cm.

The aim of this paper is to assess the effect of microwave treatment on copper sulfide ore for ball milling and bed breakage. Liberation analysis of ground products in eight size fractions showed that microwave pretreatment liberated more chalcopyrite particles from the bed breakage product than the ball mill product. In bed breakage, microwave pretreatment caused a 2% increase in chalcopyrite liberation on average. Microwave pretreatment produces more elongated particles in ball milling and more rounded particles in bed breakage, respectively. Microwave pretreatment produces coarser chalcopyrite particles with a wide range of sizes. This effect is more significant in bed breakage compared with ball milling. Micro-flotation test results showed that in ball milling, treated and untreated materials have similar metallurgical performance and there is a little difference (1%) between the average Cu recovery values. However, in bed breakage, the average recovery for the treated materials is about 5% higher than the untreated materials.

An analysis of flowsheets for processing sulfide and oxide copper ores, reagent modes, processing equipment, and flotation indicators in some domestic and foreign processing plants and productions is carried out. Autogenous and semiautogenous mills are commonly used in the primary grinding stage in ore processing plants, which excludes medium and fine crushing. The alternative is high-pressure grinding rolls, which can reduce electricity consumption compared with autogenous and semiautogenous grinding. An increase in the use of large-volume and high-performance ore-processing flotation equipment to maintain the quality and quantity of the product is noted. In addition to ball mills, fine- and ultra-fine-grinding mills in different configurations are widely used in the regrinding stage of the rougher flotation concentrate. An analysis of the flotation reagents to increase the efficiency of the separation process is made, where domestic and foreign approaches to the selection of flotation reagents are given. It should be noted that the combination of primary and secondary collectors is often used in foreign processing plants. Flotation reagents used in the processing of copper sulfide and oxide ores and their costs are presented. The combined circuit of flotation-hydrometallurgical processing of mixed copper ore at the Udokan deposit is considered. The conclusions reveal the current trends in the processing of copper ores, including the choice of equipment.

The article provides the analysis of process flows used for sulfide and oxidized copper ore treatment, reagent schemes, process equipment, indicators of flotation concentration at a number of domestic and foreign concentrating mills and plants. Autogenous and semi-autogenous grinding mills are widely used at the ore preparatory processing at the first stage of grinding to eliminate medium and fine crushing stages. An alternative is the use of high pressure grinding rolls that can reduce electricity consumption as compared to autogenous and semi-autogenous grinding. There is an increase in the use of large-volume and high-performance ore-preparation and flotation equipment for maintaining the quality and quantity of the product. In addition to ball mills, fine and ultrafine regrinding mills of various configurations are widely used at the stage of rougher flotation concentrate regrinding. The analysis of flotation reagents used to improve separation process efficiency was conducted with domestic and foreign approaches to flotation reagent selection shown. It is noted that foreign concentrating mills often use a combination of main and additional collectors. The paper provides the data on flotation reagents used in the copper sulfide and oxidized ore concentration, and their consumption. A combined diagram of flotation-hydrometallurgical processing of mixed copper ore from the Udokan deposit is considered. Conclusions are drawn about current trends in the processing of copper ores including the choice of equipment.

Copper red glaze is considered to be Chinese unique high-temperature copper colored glaze. The sample of Hongwu underglaze red of the Ming Dynasty was analyzed by scanning electron microscopy (SEM), synchrotron radiation micro-X-ray fluorescence spectroscopy (SR-μ-XRF), synchrotron radiation micro-X-ray diffraction (SR-μ-XRD) and transmission electron microscopy (TEM), the results show that there are nano-scale metal copper particles in the diffusion layer of the glaze, and irregular copper sulfide particles at the bottom layer. The presence of metal copper nanoparticles shows the glaze red, but under the influence of black copper sulfide, the appearance of underglaze red is relatively dull and dark. It is assumed that the pigments in Hongwu underglaze red are natural copper ores due to the existence of irregular particles. Referring to the record of "Bright red clay" in ancient literatures, a mixture of cuprite and chalcopyrite are probably the raw materials, the exhaustion of which may be the main reason for the interruption of copper red glaze after the mid-Ming Dynasty.

As ore grades constantly decline, more copper tailings, which still contain a considerable amount of unrecovered copper, are expected to be produced as a byproduct of froth flotation. This research reveals the occurrence mechanism of copper minerals in typical copper sulfide tailings using quantitative mineral liberation analysis (MLA) integrated with scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). A comprehensive mineralogical characterization was carried out, and the results showed that almost all copper minerals were highly disseminated within coarse gangue particles, except for 9.2wt% chalcopyrite that occurred in the 160–180 µm size fraction. The predominant copper-bearing mineral was chalcopyrite, which was closely intergrown with orthoclase and muscovite rather than quartz. The flotation tailings sample still contained 3.28wt% liberated chalcopyrite and 3.13wt% liberated bornite because of their extremely fine granularity. The SEM-EDS analysis further demonstrated that copper minerals mainly occurred as fine dispersed and fully enclosed structures in gangue minerals. The information obtained from this research could offer useful references for recovering residual copper from flotation tailings.

The structure and phase composition of synthesized copper(I) sulfide are studied. It is shown that, both chalcocite (Cu2S) and jarleite (Cu31S16) phases can form in the copper sulfide crystallization. Jarleite is characterized by a deficit of copper in the crystal lattice and a deviation from the stoichiometric composition. The formation of jarleite is associated with the crystallization of the copper metal phase. The crystal lattice parameters of the synthesized phases are calculated. It is shown that they correlate with the database of International Center for Diffraction Data. The electrochemical oxidation of specimen in the sulfuric acid solution is carried out. It is found that at a current density of 1000 A/m2 and a concentration of 100 g/dm3 H2SO4, the electrochemical dissolution of copper sulfide proceeds with the formation of passive film of slightly soluble products due to the oxidation of copper(I) sulfide to copper(II) sulfide. In addition, in the course of oxidation, intermediate nonstoichiometric sulfides (Cu1.74S, Cu1.8S, Cu1.6S, and CuS) form in the following order: Сu2S (Cu31S16) → Cu1.8S → Cu1.74S → Cu1.6S → CuS → S + Cu2+. The process is accompanied by the transition of copper cations into the solution. As elemental sulfur and copper sulfides are accumulated on the specimen reactive surface, the electrochemical oxidation rate decreases due to slow removal of the products and slow supply of the reagent to the reaction zone.

The hole density of individual copper sulfide nanocrystals (Cu2-xS NCs) is determined from the stoichiometric mismatch (x) between copper and sulfide atoms. Consequently, the electronic properties of the material vary over a range of x. To exploit Cu2-xS NCs in devices, assemblies of NCs are typically required. Herein, we investigate the influence of x, referred to as the stoichiometric doping effect, on the structural, optical, electrical, and thermoelectric properties of electronically coupled Cu2-xS NC assemblies. The doping process is done by immersing the solid NC assemblies into a solution containing a Cu(I) complex for different durations (0-10 min). As Cu+ gradually occupied the copper-deficient sites of Cu2-xS NCs, x could be controlled from 0.9 to less than 0.1. Consequently, the near-infrared (NIR) absorbance of Cu2-xS NC assemblies changes systematically with x. With increasing x, electrical conductivity increased and the Seebeck coefficient decreased systematically, leading to the maximal thermoelectric power factor from a film of Cu2-xS NCs at an optimal doping condition yielding x = 0.1. The physical characteristics of the Cu2-xS NC assemblies investigated herein will provide guidelines for exploiting this emerging class of nanocrystal system based on doping.

Hg(II) ions in wastewater are highly toxic to the environment and human health, yet many materials to remove the ions exhibit lower adsorption efficiency, and few studies report the reuse of Hg(II)-loaded waste materials. Here, a cheap and efficient adsorbent was prepared for the removal of Hg(II) based on corn bracts (CB) loading copper sulfide (CuS), and the Hg(II)-adsorbed material was reused as a photocatalyst. By changing the adsorption variables such as pH, adsorbent dosage, Hg(II) concentration, contact time and coexisting ions, the optimum adsorption conditions were obtained. The study indicated the adsorption capacity and removal rate of CB/CuS reached 249.58 mg/g and 99.83% at pH 6 with 20 mg CB/CuS, 50 mL Hg(II) concentration (100 mg/L) and 60 min, and coexisting ions did not affect the uptake of Hg(II). The adsorption behavior of CB/CuS toward Hg(II) followed pseudo-second-order and Langmuir models, with the theoretical maximum adsorption capacity of 316.46 mg/g. Finally, we explored an alternative strategy to dispose of spent adsorbents by converting the CB/CuS/HgS into a photocatalyst for the degradation of rhodamine B, with a removal rate of 98%. Overall, this work not only develops a promising material for the treatment of Hg(II)-containing wastewater, but opens up a new approach for the use of the waste adsorbent. HIGHLIGHTS Corn bracts as a carrier of CuS was designed for rapid uptake of Hg(II).; The removal rate of the adsorbent could reach 99.83% in only 60 min.; The theoretical maximum could reach 316.46 mg/g.; Coexisting ions had no significant effect on selective Hg(II) ion removal.; The spent adsorbent was used for photodegradation reaction.

The nanostructured carbonaceous materials (CNTs, graphene, and activated carbon) possess excellent conductivity, larger surface area, good chemical stability, and unique structure. Therefore, these materials have great potential to boost the electrochemical performance of the transition metals based pseudocapacitive materials. In this study, the hydrothermal method was used to prepare copper sulfide nanochips. The electrical conductivity and capacitive properties of the fabricated sample were improved by forming their nanohybrid with conductive as well as capacitive CNTs. The morphological, structural, compositional, and electrical behavior of materials was investigated by conducting various analyses. The calculated electrical conductivity value of the nanohybrid sample (2.34 × 102 Sm−1) was considerably higher than the bare sample (1.85 × 10−4 Sm−1), which ensured the existence of a positive association between cobalt sulfide nanochips and one-dimensional CNTs. During electrochemical testing, the nanohybrid sample showed a much better capacitive ability than the pristine cobalt sulfide sample due to its tuned electrical properties, hybrid composition, and constructive interaction between its supplements. More precisely, the nanohybrid sample displayed a good gravimetric capacitance (Cg) (677 Fg-1) at 1 Ag-1 and excellent capacitance retention (81.9%) at 5 Ag-1. Moreover, the nanohybrid sample showed superior cyclic-aptitude as it lost only 17.7% capacity, whereas the pristine metal sulfide sample lost nearly 36% of its initial capacity after 1000 cyclic discharge experiments. The electrochemical results showed that our synthesized sample offer excellent potential for practical application in next-generation electrochemical equipments.

Near-infrared (NIR)-II light-excitable photonic agents capable of generating tumor hyperthermia and cytotoxic free radicals are promising for synergistic phototherapy of tumors. However, the lack o...

Lignin has been considered to be an ideal carrier for the construction of lignin-based antibacterial materials by its biocompatibility and environmentally benign feature. Herein, lignosulfonate (LS) was utilized as a growth template and a stabilizing agent to synthesize lignin-copper sulfide (LS-CuS) nanocomposites. Interestingly, the as-prepared LS-CuS nanocomposites show enhanced photothermal performance and peroxidase-like activity with near-infrared (NIR) light activation, which benefits highly efficient bacteria-killing via synergistic photothermal–catalytic effects. The bactericidal tests indicated that LS-CuS nanocomposites (100 μg/mL) cause 5.9-log₁₀ and 5.4-log₁₀ CFU/mL reductions against Escherichia coli and Staphylococcus aureus under NIR light irradiation (808 nm, 1.8 W/cm²) for only 5 min in the presence of H₂O₂. Moreover, LS-CuS nanocomposites can be blended with waterborne polyurethane (WPU) to obtain hybrid films, which also achieves a bactericidal efficacy of more than 90% in 5 min. Considering the low cost, easy preparation, and environmental friendliness of LS-CuS nanocomposites, this study may provide new insights into the design of lignin-based inorganic nanocomposites with high bacteria-killing efficiency in a sustainable manner.

In the current paper, copper sulfide nanotubes have been successfully synthesized via the green, simple, and effective gamma-radiolysis method without adding any capping or reducing agents. The structural and morphological characteristics of the as-prepared CuS nanotubes were investigated by X-ray diffraction (XRD), N2 adsorption-desorption measurements at 77 K, transmission electron microscopy (TEM), and ultraviolet-visible (UV-vis) spectroscopy, which all demonstrated the formation of pure CuS covellite phase with tubular morphology. The synthesized CuS nanotubes possessed not only high activity towards the reduction of both cationic (methylene blue) and anionic (Congo red) dyes in the presence of NaBH4 but also exhibited excellent reusability. In addition, the pseudo-first-order kinetic model represented the reduction of MB very well, and the value of the normalized rate constant (2.4 × 10−2 s−1 mg−1) was higher than those of other solid catalysts reported in the literature. Ultimately, CuS nanotubes were found to have a broad-spectrum microbicidal action against the common microbiota, such as Gram-positive (exemplified by Bacillus subtilis and Staphylococcus aureus), Gram-negative bacteria (exemplified by Pseudomonas aeruginosa and Escherichia coli), yeast (exemplified by Candida albicans), and plant pathogenic fungi (exemplified by Aspergillus niger).

In recent years, low-cost wearable energy storage devices attract much more attention. In this work, the PET/CuS/PPy composite electrodes are fabricated for portable flexible solid-state supercapac...

The limited availability of conventional water resources and inefficient water management has resulted in seawater use in the flotation process of copper sulfide ores at several concentrator plants...

A crucial parameter in the design of semiconductor nanoparticles (NPs) with controllable optical, magnetic, electronic, and catalytic properties is the morphology. Herein, we demonstrate the potential of additive metal cations with variable valency to direct the morphology evolution of copper-deficient Cu2-x S nanoparticles in the process of seed-mediated growth. In particular, the djurleite Cu1.94 S seed could evolve from disk into tetradecahedron in the presence of tin(IV) cations, whereas they merely formed sharp hexagonal nanodisks with tin(II) cations. In addition to djurleite Cu1.94 S, the tin(IV) cations could be generalized to direct the growth of roxbyite Cu1.8 S and covellite CuS nanodisk seeds into tetradecahedra. We further perform pseudomorphic cation exchanges of Cu1.94 S tetradecahedra with Zn2+ and Cd2+ to produce polyhedral zinc sulfide (ZnS) and cadmium sulfide (CdS) NPs. Moreover, we achieve Cu1.8 S/ZnS and Cu1.94 S/CdS tetradecahedral heterostructures via partial cation exchange, which are otherwise inaccessible by traditional synthetic approaches.

The United Nations’ Sustainable Development Goals have sparked growing interest in biosurfactants from many surfactant-loaded industries including those utilizing froth flotation for mineral separation. However, the interaction of biosurfactants with mineral surfaces is currently poorly understood. We bridge this gap by studying adsorption of a yeast-derived bola acidic sophorolipid (ASL) biosurfactant on djurleite (Cu1.94S). The methods used include Hallimond flotation, contact angle, adsorption isotherm, zeta potential, leaching measurements, and X-ray photoelectron spectroscopy (XPS). To facilitate the interpretation of the adsorption results, we characterize the activity of ASL at the air-water interface and measure its critical micelle concentration (CMC) at different pH using static surface tension. We find ASL to be a multifunctional surfactant with an unusual, pH-sensitive interfacial behavior. At the air-water interface, ASL is most active at pH 8, while its CMC goes through minimum as low as 40 μM at pH 7. The surfactant adsorption at the djurleite-water interface makes the sulfide surface hydrophilic at acidic pH and hydrophobic at neutral and basic pH. In addition, ASL has strong affinity to copper sulfide and demonstrates metal leaching properties. Finally, ASL demonstrates detergency properties. We offer a mechanistic interpretation of these findings. Our results provide a basis for the application of acidic glycolipids in froth flotation and have implications for their application in ion separation using hydrometallurgical routes, as well as for the chemical stability of metal sulfides in environmental systems. © 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

The copper sulfide precipitation is a selective and efficient method for the recovery or removal of metals. However, the suspension behavior, and particularly the aggregation performance of generated precipitates, is still under investigation. In this context, the current work focuses on the assessment of the aggregation size evolution of copper sulfide precipitates at different operational conditions, based on FBRM. This method can measure non-invasive, in-situ and real-time the particle aggregation evolution in a suspension. A copper sulfide precipitation reaction was carried out using an experimental design varying pH, sulfide dosage, and copper concentration in the feed solution. The copper concentration had the most significant effect on the aggregates size, showing a high aggregation behavior above 1000 mg/L Cu, instead 200 mg/L where this tendency was negligible. This study is the first one to use FBRM in copper precipitates and its results can be used to support future studies to improve solid-liquid separation processes.

Due to high affinity and specificity of aptamers, they are widely considered for construction of aptasensor to specific recognizing of analytes in biological complex matrix. So, in this work we design a high selective and sensitive aptasensor for leukemia cancer cells (CCRF-CEM) via superior catalytic effect of copper sulfide-graphene (CuS-GR) nanocomposite as label and Au-GR nanocomposite as sensing platform. The CuS-GR nano-composite (label component) is CuS nanoparticles that wrapping on graphene sheets. Its catalytic activity (CuS-GR) increases the current of sensor in parallel with adding of CCRF-CEM and provide sensitive detection of analytes. The detailed of signal amplification and effect on the aptasensor performance completely discussed. This sensor has a linear range of 50–1 × 106 cell mL−1, with a limit of detection of 18 cell mL−1. Also, the developed aptasensor has a significance specificity, high sensitivity and accuracy. It was used for the identification of CCRF-CEM cells in blood samples.

Hypothesis: The anodic dissolution of chalcopyrite (CuFeS2) encounters the problem of surface passivation, which significantly affects the copper extraction efficiency. So far, there is no agreement on the passivation mechanism and composition of passive layer, which could be studied by using in-situ scanning electrochemical microscopy (SECM). Experiments: SECM was applied for the in-situ probing of chalcopyrite dissolution under mild oxidation potentials. The surface hydrophobicity and nanoscale distribution of hydrophobic domains were analyzed by static water contact angle measurement and atomic force microscope (AFM) force mapping, respectively. The surface conductivity was characterized by SECM feedback mode. Findings: The concentrations of released species Fe2+, Cu2+ and soluble copper sulfide species (CuxS) generally increased with the potential of chalcopyrite. In the active region (low potentials), Fe2+ was preferentially released, and the metal-deficient sulfide layer that was rich in copper relative to iron started to form as the passive layer. While the release of Fe2+ and Cu2+ was impeded in the passive region, the detected CuxS became pronounced in this region and the following transpassive region, which suggested that the existence of CuxS was a result of passive layer dissolution. The nanoscale distribution of hydrophobic domains suggested that the formation of hydrophobic passive layer initiated in the active region and this layer almost completely covered the chalcopyrite surface at the beginning of passive region. The surface conductivity of chalcopyrite decreased with potential due to the formation of less conductive metal-deficient sulfide layer and possibly insulating elemental sulfur (in the transpassive region). This work provides a new approach for the in-situ probing of chalcopyrite dissolution and useful insights into its dissolution kinetics and passivation mechanisms, with implications for similar electrochemical processes of other mineral surfaces.

The mechanochemical reaction kinetics of sulfur with copper to form a metastable copper sulfide phase at room temperature is investigated in ultrahigh vacuum by modifying the properties of the copper during cleaning in vacuum. The measured kinetics is in agreement with a theory first proposed by Karthikeyan and Rigney that predicts that the rate depends linearly both on the contact time and on the strain-rate sensitivity of the substrate. The mechanism for this process was investigated using thin samples of copper fabricated using a focused-ion-beam and by measuring the crystal structure and elemental composition of the copper subsurface region by electron microscopy after reaction. The measured sulfur depth distributions produced by shear-induced surface-to-bulk transport were in good agreement with values calculated using rate constants that also model the reaction kinetics. Sulfur was found both in crystalline regions and also concentrated along grain boundaries, implying that formation of metastable phases is facilitated by both the presence of dislocations and by grain boundaries.

Hexagonal boron nitride (h-BN), as a novel carbon-free layered material, has received extensive attention owing to its high mechanical strength and excellent chemical and thermal stability. Herein,...

High-purity copper sulfides including CuS, Cu1.75S and Cu2S were synthesized using an easy and controllable two-step heating method in a mixed solution of ethylene glycol and triethylenetetramine. Petal-like CuS, near-spherical Cu2S, and regular hexagonal Cu1.75S were obtained by simply changing the solvent volume ratio (SVR) of the mixed solution, i.e. the phase of the products solely determined by the SVR of the solution. The influence of the solvent on the final products as well as the reaction mechanism of the system were investigated and discussed. The approach is rapid, easily scalable, and environmentally friendly. As a preliminary application demonstration, dye-sensitized solar cells were assembled using the as-synthesized copper sulfides and photoelectric conversion efficiencies up to 3.62% were achieved.

Ultrathin two-dimensional (2D) semiconductors exhibit outstanding properties, but it remains challenging to obtain monolayer-structured inorganic semiconductors naturally occurring as nonlayered crystals. Copper sulfides are a class of widely studied nonlayered metal chalcogenide semiconductors. Although 2D copper sulfides can provide extraordinary physical and chemical applications, investigations of 2D copper sulfides in the extreme quantum limit are constrained by the difficulty in preparing monolayered copper sulfides. Here, we report a subnanometer-thin quasi-copper-sulfide (q-CS) semiconductor formed upon self-assembly of copper(I)-dodecanethiol complexes. Extended X-ray absorption fine structure analysis revealed that the existence of Cu-Cu bonding endowed the layer-structured q-CS with semiconductor properties, such as appreciable interband photoluminescence. Theoretical studies on the band structure demonstrated that the optical properties of copper-dodecanethiol assemblies were dominated by the q-CS layer and the photoluminescence originated from exciton radiative recombination across an indirect band gap, borne out by experimental observation at higher temperatures, but with the onset of a direct emission process at cryogenic temperatures. The following studies revealed that the metal-metal bonding occurred not only in copper-alkanethiolate complex assemblies with variable alkyl chain length but also in silver-alkanethiolate and cadmium-alkanethiolate assemblies. Therefore, the current studies may herald a class of 2D semiconductors with extremely thin thickness out of nonlayered metal sulfides to bridge the gap between conventional inorganic semiconductors and organic semiconductors.

In this research, an aqueous reflux method was utilized to synthesize copper sulfide nanostructures with different morphologies, such as flower-like based nanosheets and spherical nanoparticles. The reaction was performed in oleic acid medium, using copper(II) acetylacetonate [Cu(acac)2] and elemental sulfur as the Cu2+ and S2− sources, respectively. Then, the effect of refluxing temperature, precursor molar ratios and reaction time on the particle phase and morphology of synthesized particles was investigated. The results show that a 1 : 1 ratio of [Cu (acac)2] to S2− at 200 °C reflux temperature for 10 h exhibit optimum conditions for forming a pure hexagonal Cu7.2S4 phase. Then, the surface of the synthesized Cu7.2S4 was also modified by hydrophilic polyethylene glycol (PEG), and the modified nanoparticles were used in the release of the drug doxorubicin at pH = 5.4, pH = 7.4 under in vitro conditions, which was monitored by UV-Vis spectroscopy. The results showed that drug release under acidic conditions is greater than that under neutral conditions. Furthermore, by increasing the sulfur content, the sample's morphology was changed from a spherical shape to flower-liked based nanosheets, and the phase tends to be the CuS phase. Finally, the synthesized Cu7.2S4 nanostructures were used for the photocatalytic degradation of some dyes, including Reactive Blue 21 (RB21), Reactive Red 120 (RR120), and Reactive Orange 5 (RO5). The results showed that the highest degradation percentage for RB21 pigment was 99%.

The authors compare the effect exerted by copper ions and sulphide copper nanoparticles on flotation of Gorevka deposit sphalerite using potassium n-butyl xanthate and in reagent-less regime. Covelline-like colloid particles 4–8 nm in size, obtained in interaction of copper (II) and sulfide ions in aqueous solutions, are characterized using the methods of dynamic light scattering, electron microscopy and diffraction. Sphalerite surface after reaction with copper ions and CuS dispersoid solutions are described by zeta-potential measurements and X-ray photoelectron spectroscopy. It is found that sphalerite flotation after activation with nanoparticles is lower than with copper ion solutions of the same concentrations, and improves with increasing duration of activation and flotation processes. The mechanism of CuS nanoparticles consists in creation of active centers for the collector to attach to, which intensifies the hydrophobic behavior and adsorption of the collector. Moreover, CuS nanoparticles promote formation of a special microrelief of the solid–liquid interface, which ensures rupture of liquid film and attachment of sphalerite particles to air bubbles when they collide.

Paracetamol (PA) is a ubiquitous non-steroidal anti-inflammatory drug, mainly used to treat headaches, arthritis and osteoarthritis and other diseases. In this work, a novel label free photoelectrochemical (PEC) sensor based on Bi–CuS/Bi2WO6 has been developed for the detection of PA, which was fabricated by a simple two-step hydrothermal process. It was found that Bi–CuS/Bi2WO6 with a CuS/Bi2WO6 heterojunction and surface plasmon resonance (SPR) effect of Bi possesses enhanced charge transfer and absorption wavelengths under visible light, particularly when compared to pristine Bi2WO6 films, thus producing an increase in the observed photocurrent. The photocurrent was increased after adding PA. And the photocurrent increment was linear with PA concentration in the range from 0.01–60 μM with a detection limit of 2.12 nM. Moreover, the PEC sensor also exhibited high anti-interference property and acceptable stability. In the present study, a Bi–CuS/Bi2WO6 photoelectrode is considered a promising candidate for carrying out PEC analysis.

Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is crucial for various sustainable energy devices such as rechargeable Zn–air batteries. Phase engineering has been proven to effectively tune the active-site electronic structure and thus improve the activity of electrocatalysts. However, phase transition usually induces morphology transformation, and the influence of realistic morphological feature change on the activity of electrocatalysts has seldom been considered. Herein, we present a facile thermal annealing strategy to transform cobalt–copper oxide nanosheets (Co2Cu1-ONS) into nanoparticle-stacked porous sulfide nanonetworks (Co2Cu1–S). Density functional theory (DFT) and dynamic DFT calculations confirm that the S thermal annealing process could bring about higher intrinsic activity of active sites and faster mass transfer of reactants, which endow Co2Cu1–S with remarkably higher OER/ORR catalytic performance than that of Co2Cu1-ONS and Co3S4. Its potential gap between the potential for an OER current density of 10.0 mA cm−2 and the ORR half-wave potential is as low as 0.74 V. The Co2Cu1–S is then employed as an air electrode for a rechargeable Zn–air battery, which exhibits a peak power density of 0.195 W cm−2, high specific capacity of 815.3 mA h g−1, and robust stability (up to 80 h).

Mass production of semiconductor quantum dots (QDs) from bulk materials is highly desired but far from being satisfactory. Herein, we report a general strategy to mechanically tailor semiconductor bulk materials into QDs. Semiconductor bulk materials are routinely available via simple chemical precipitation. From their bulk materials, a variety of semiconductor (e.g., lead sulfide (PbS), cadmium sulfide (CdS), copper sulfide (CuS), ferrous sulfide (FeS), and zinc sulfide (ZnS)) QDs are successfully produced in high yields (>15 wt%). This is achieved by a combination of silica-assisted ball-milling and sonication-assisted solvent treatment. The as-produced QDs show intrinsic characteristics and outstanding water solubility (up to 5 mg mL-1), facilitating their practical applications. The QD dispersions present remarkable photoluminescence (PL) with exciton-dependence and nanosecond (ns)-scale lifetimes. The QDs-poly(methyl methacrylate) (PMMA) hybrid thin films demonstrate exciting solid-state fluorescence and exceptional nonlinear saturation absorption (NSA). Absolute modulation depths of up to 58% and saturation intensities down to 0.40 MW cm-2 were obtained. Our strategy could be applied to any semiconductor bulk materials and therefore paves the way for the construction of the complete library of semiconductor QDs.

Flexible and wearable electronic technology is in great demand with the rise of smart electronic systems. Among these, multifunctional systems with high performance at low cost have attracted extensive attention of scholars from the practical application perspective. However, the fabrication of devices with multifunctionality without sacrificing their connatural flexibility advantages remains a huge challenge. In this study, a CuS-modified glass fiber first acts as a bifunctional wearable electronic device for superior thermal management and electromagnetic interference (EMI) shielding. Specifically, the inherent glass fiber was initially modified with a silane coupling agent for the amino group (–NH2) functionalization followed by further CuS deposition via a facile electroless plating technology. Interestingly, due to the strong interaction between CuS and the glass fiber through the coordinate –NH2 and Cu2+, the prepared copper sulfide/glass fibers (CuS/GFs) not only keep the inherent flexibility and lightness of the fiber substrate, but also have excellent electrothermal conversion performance accompanied by a wide temperature range (38 °C–209 °C), low working voltage (0.3 V–1.5 V), and rapid response time (reaching 209 °C within 10 s at 1.5 V). Moreover, the prepared CuS/GF textile also exhibits interesting electromagnetic interference shielding efficiency (EMI SE) of 61 dB as well as a high specific shielding effectiveness up to 6130.65 dB cm2 g−1 with a CuS mass loading of 9.95 mg cm−2. These features confirm the potential of CuS/GFs as a flexible, wearable, and efficient electrical heater and EMI shielding material for the new type of intelligent electronic devices.

A high-performance electrochemical sensing platform based on CuS nano-globules is efficiently developed. The CuS nano-globules are synthesized through a hydrothermal process. All the important physical characteristics of the nanomaterial such as crystal architecture, morphology, topography and composition are investigated. To better demonstrate the electrochemical sensing capability of CuS nano-globules reinforced electrodes, hydroquinone (HQE) is chosen as an analyte. Upon the electrochemical investigation, the CuS-based sensor displayed an enhanced detection limit of 0.135 μM with a linear range of 1–2287 μM. The overall sensing performance of CuS nano-globules-equipped electrode towards HQE is very impressive with good stability and reproducibility. These investigative results evidently indicate the superior electrochemical properties of CuS nano-globules and they can be highly recommended for real-time analysis.

This paper introduces a full study of CuS thin-film deposited on the quartz substrate. Copper sulfide thin films were prepared using the pulsed laser deposition technique and tested before and after the annealing process. The structural, morphological, and optical properties are examined after the deposition process at different energies (500 mJ, 600 mJ, 700 mJ, 800 mJ). The experimental results show that the best optical absorption is achieved at 600 mJ; this value was annealed at different annealing temperatures (300 °C, 350 °C, 400 °C, and 450 °C). The effect of thermal annealing on CuS film was examined to find the thickness range and the absorption behavior between 300 and 1100 nm. The average surface roughness was evaluated and discussed according to decrease with an increase in the annealing temperatures. Absorption and AFM results were studied thoroughly. Copper sulfide Film could find applications in optical devices such as surface plasmon resonance, window coatings, and optical gas sensors.