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[Display omitted] • A spatial-time-dual-resolved PL switching system based on 0D Mn-based metal halides. • Excellent reversible phase conversion properties between crystalline and molten states. • Superior PL switching with short response times and ultrahigh cyclic reversibility. • Screen printing fluorescent security labels with high spatial resolution and convenience. • Versatile multi-level information encryption-decryption and anti-counterfeiting. While spatial and time-resolved anti-counterfeiting technologies have gained increasing attention owing to their excellent tunable photoluminescence, achieving high-security-level anti-counterfeiting remains a challenge. Herein, we developed a spatial-time-dual-resolved anti-counterfeiting system using zero-dimensional (0D) organic–inorganic Mn(II) metal halides: (EMMZ) 2 MnBr 4 (named M−1 , EMMZ=1-Ethyl-3-Methylimidazolium Bromide) and (EDMMZ) 2 MnBr 4 (named M−2 , EDMMZ=1-Ethyl-2,3-Dimethylimidazolium Bromide). M−1 shows a bright green emission with a quantum yield of 78 %. It undergoes a phase transformation from the crystalline to molten state with phosphorescence quenching at 350 K. Reversible phase and luminescent conversion was observed after cooling down for 15 s. Notably, M−2 exhibits green light emission similar to M−1 but undergoes phase conversion and phosphorescence quenching at 390 K, with reversible conversion observed after cooling down for 5 s. The photoluminescence switching mode of on(green)-off–on(green) can be achieved by temperature control, demonstrating excellent performance with short response times and ultra-high cyclic reversibility. By leveraging the different quenching temperatures and reversible PL conversion times of M−1 and M−2 , we propose a spatial-time-dual-resolved photoluminescence (PL) switching system that combines M−1 and M−2. This system enables multi-fold tuning of the PL switch for encryption and decryption through cationic engineering strategies by modulating temperature and cooling time. This work presents a novel and feasible design strategy for advanced-level anti-counterfeiting technology based on a spatial-time-dual-resolved system. [ABSTRACT FROM AUTHOR]

Graphene-based dielectric materials, known for their high conductivity, hold promise for electromagnetic shielding, yet face limitations due to production challenges. To address this, we employed homogenization and ultrasound techniques to disrupt van der Waals bonding, followed by the addition of cellulose as a barrier to inhibit particle aggregation. Graphene nanosheets were layered through screen-printing techniques. By subjecting the structure to an annealing process that carbonized the barrier, graphene nanosheets were brought into contact, establishing an electron hopping pathway. This process led to a significant surge in conductivity, jumping from 23.8 to 633.0 S/cm. Leveraging the superior conductivity induced by graphene nanosheets compaction and reduced defects, the resulting printed films, with a thickness of 15.8 μm, achieved an electromagnetic interference shielding effectiveness (EMI SE) of 30.8 dB, and with a thickness of 7.8 μm, demonstrated a high absolute shielding effectiveness (SSE/t) of 25571 dB cm2 g−1. Our findings present a viable strategy for enhancing shielding capabilities of other 2D materials such as MXenes and transition metal sulfides (TMDC) [ABSTRACT FROM AUTHOR]

The ratiometric sensing strategy, which uses dual-signal output, drastically compensates for the background noise and interference from the detection environment, compared to the sensing methods that rely on a single-signal output. However, the stability of the reference signal has become the primary challenge in constructing a ratiometric detection sensor. Therefore, in order to achieve stable ratiometric signal sensing, methylene blue (MB) was encapsulated in the UiO-66-NH2 framework and printed as a reference signal onto a screen-printed carbon electrode (SPCE), facilitating the precise detection of miR-21-5p. Subsequently, based on the ultra-sensitive detection mechanism of catalytic hairpin assembly (CHA), the combination of miR-21-5p with H1 sequence on the Au-deposited SPCE triggered the loopopen of H1. After that, ferrocene-labeled H2 (H2-Fc) and H3-Fc sequences were sequentially added to form a stable "T-shaped" structure, and miR-21-5p was released into the next cycle. Thus, the detection of miR-21-5p was quantified by the current ratio of Fc to MB, obtaining an ultra-low detection limit of 2.7 fM. This ratiometric sensing strategy based on SPCE offers a promising pathway for highly sensitive sensing platforms. [ABSTRACT FROM AUTHOR]

Toxic materials are a threat in workplaces and the environment, as well as households. In them, gaseous substances are included, especially ones without any colour or fragrance, due to their non-detectability with the human senses. In this article, an attempt was made to find a solution for its detection in various conditions with the use of intelligent textiles. The approach was to perform modification on fifteen materials by screen printing using carbon nanotubes paste with expanded graphite and embroidery with stainless steel thread and then investigate their reaction with risky gases such as acetone, methanol and toluene. Four combinations of samples were tested: before tests, after the washing test and after the alkaline and acidic sweat contact test. Three materials can be highlighted. Para-aramid knitwear which reacted well to all tested gases. The biggest value of sensory percentage response was 144%. Screen-printed linen knitwear showed properly detecting skills after washing test for toluene. The biggest value of sensory percentage response was noted at 186%. The third most promising material was low surface mass cotton knitwear with embroidery which had a visible response at every stage of testing for acetone. The biggest value of sensory percentage response was 94% and the smallest one was 27%. For these three materials, repeated contact with harmful gases was tested. Simulations showed also repeated responses expressed in changes in surface resistance under changed conditions. After analysis, there is a possibility to create textile sensors for the detection of hazardous substances. [ABSTRACT FROM AUTHOR]

Perovskite solar cells (PSCs) offer a number of key advantages over silicon solar cells. These include their low-cost materials, high efficiency, simplicity of fabrication, and inexpensive manufacturing techniques. To commercialize PSCs, there are many methods to develop the quality of the cells, one of them being printing techniques. Different printing techniques deposition have been developed for the perovskite solar cell, such as blade coating, slot die coating, inkjet printing, screen printing, spray coating, flexographic printing, and gravure printing. These techniques have a substantial impact on the performance of PSCs and controlling film formation to commercialize PSCs. This review summarizes a comprehensive overview of various deposition printing techniques used to fabricate PSCs during different years and different techniques, such as using different preparation methods, novel drying techniques, and ink engineering. In addition, the challenges that are faced by using these, such as material stability, reproducibility of printing processes, and cost-effectiveness techniques, are reviewed. Future research should focus on optimizing printing techniques to improve the stability and scalability of PSCs. Exploring novel perovskite materials, deposition techniques, and innovative fabrication methods may further enhance the PSCs and facilitate their commercialization. [ABSTRACT FROM AUTHOR]

Flexible thermoelectric systems capable of converting human body heat or solar heat into sustainable electricity are crucial for the development of self-powered wearable electronics. However, challenges persist in maintaining a stable temperature gradient and enabling scalable fabrication for their commercialization. Herein, we present a facile approach involving the screen printing of large-scale carbon nanotube (CNT)-based thermoelectric arrays on conventional textile. These arrays were integrated with the radiation-modulated thermoelectric fabrics of electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membranes for the low-cost and high-performance wearable self-power application. Combined with the excellent photothermal properties of CNTs, the resulting thermoelectric fabric (0.2 square meters) achieves a substantial T of 37 kelvin under a solar intensity of ~800 watt per square meter, yielding a peak power density of 0.20 milliwatt per square meter. This study offers a pragmatic pathway to simultaneously address thermal management and electricity generation in self-powered wearable applications by efficiently harvesting solar energy. [ABSTRACT FROM AUTHOR]

As part of the evolving Industry 4.0 landscape, machine learning-based visual inspection plays a key role in enhancing production efficiency. Screen printing, a versatile and cost-effective manufacturing technique, is widely applied in industries like electronics, textiles, and automotive. However, the production of complex multilayered designs is error-prone, resulting in a variety of defect appearances and classes. These defects can be characterized as small in relation to large sample areas and weakly pronounced. Sufficient defect visualization and robust defect detection methods are essential to address these challenges, especially considering the permitted design variability. In this work, we present a novel automatic visual inspection system for surface defect detection on decorated foil plates. Customized optical modalities, integrated into a sequential inspection procedure, enable defect visualization of production-related defect classes. The introduced patch-wise defect detection methods, designed to leverage less labeled data, prove effective for industrial defect detection, meeting the given process requirements. In this context, we propose an industry-applicable and scalable data preprocessing workflow that minimizes the overall labeling effort while maintaining high detection performance, as known in supervised settings. Moreover, the presented methods, not relying on any labeled defective training data, outperformed a state-of-the-art unsupervised anomaly detection method in terms of defect detection performance and inference speed. [ABSTRACT FROM AUTHOR]

This paper presents a comparative study of the electrochemical pH sensing characteristics of N-ZnO on a carbon screen-printed electrode (N-ZnO/C) and a silver screen-printed electrode (N-ZnO/Ag). The surface-morphological properties of the film were evaluated using scanning electron microscopy. Electrochemical evaluation was carried out in the presence of common salts present in physiological fluids like NaCl and KCl. Cyclic voltammetry (CV) and chronoamperometry (CA) were carried out to evaluate the response characteristics of the solution under different pHs. Electrochemical impedance spectroscopy (EIS) was carried out to determine the interfacial parameters ruling the pH sensing mechanism for different electrode configurations. The studies revealed that the carbon-based electrodes exhibit stable behavior, with a sensitivity of 17.8 nA·cm−2/pH and a linear correlation (r2 = 0.996) across a range of acidic to basic conditions, thereby enhancing the sensor's performance. The carbon electrodes demonstrated superior sensing properties, attributed to their improved stability and conductivity. This advancement in sensor technology offers promising potential for applications requiring reliable and precise measurements. [ABSTRACT FROM AUTHOR]

Cellulose nanocrystals (CNCs) have the potential to be used as functional hybrid composite materials derived from biological sources. CNCs possess a rod-like structure and surface functionality that allows for chemical modifications. These chemically modified CNCs exhibit liquid-crystalline phases, although their phase behavior has received less attention in research. For this study, we examined CNCs derived from waste lignocellulosic mass. We subjected them to chemical modification using maleic anhydride (MA) at a degree of substitution of 0.39 molecules of MA per glucose unit. The surface modification was confirmed using spectroscopic techniques. The diameter of CNCs that underwent MA tuning was decreased from the original size of 23.8–15.4 nm. The phase behavior of the modified MACNCs was thoroughly examined and showed a biphasic pattern until reaching a concentration of 9.65 × 107 nm−3. Furthermore, an assessment was conducted on the thermal stability of the prepared MACNCs, and a modeling approach was used to determine the thermal degradation kinetics. These MACNCs were used as a subtle pigment on paper through screen printing, stamping, and pen techniques. This type of aqueous ink is highly valuable for protecting books, drafts, and banknotes from counterfeiting. [ABSTRACT FROM AUTHOR]

Prussian Blue (PB) is commonly incorporated into screen-printed enzymatic devices since it enables the determination of the enzymatically produced hydrogen peroxide at low potentials. Inkjet printing is gaining popularity in the development of electrochemical sensors as a substitute for screen printing. This work presents a fully inkjet-printed graphene–Prussian Blue platform, which can be paired with oxidase enzymes to prepare a biosensor of choice. The graphene electrode was inkjet-printed on a flexible polyimide substrate and then thermally and photonically treated with intense pulsed light, followed by inkjet printing of a PB nanoparticle suspension. The optimization of post-printing treatment and electrode deposition conditions was performed to yield a platform with minimal sheet resistance and peak potential differences. A thorough study of PB deposition was conducted: the fully inkjet-printed system was compared against sensors with PB deposited chemically or by drop casting the PB suspension on different kinds of carbon electrodes (glassy carbon, commercial screen-printed, and in-house inkjet-printed electrodes). For hydrogen peroxide detection, the fully inkjet-printed platform exhibits excellent sensitivity, a wider linear range, better linearity, and greater stability towards higher concentrations of peroxide than the other tested electrodes. Finally, lactate oxidase was immobilized in a chitosan matrix, and the prepared biosensor exhibited analytical performance comparable to other lactate sensors found in the literature in a wide, physiologically relevant linear range for measuring lactate concentration in sweat. The development of mediator-modified electrodes with a single fabrication technology, as demonstrated here, paves the way for the scalable production of low-cost, wearable, and flexible biosensors. [ABSTRACT FROM AUTHOR]

• Modified surfaces by electrodeposit of Prussian Blue (PB) on carbon (C) and carbon nanotubes (CNT). • PB-CNTCࣦC modified electrode showed the highest current density in Cl 2 Ru(NH 3) 6 presence. • The highest detection and quantification limits of Na+ were obtained using PB-CNTࣦC. • PB showed a cube shape in order of the number of cycles, indicating a 3D growth over CNTࣦC. • Electrochemical detection of exchangeable Na+ using PB-CNTࣦC competes with flame atomic adsorption. Different ways to quantify ions in solutions require the pre-treatment of the sample and experimental measurements to be performed. This research proposes to develop an electrochemical method for ions, specifically for sodium ions, using modified surfaces by electrodeposit of Prussian Blue (PB) on carbon (C) and carbon nanotubes (CNT) to get PB-C and PB-CNT. It was observed that the PB-CNTCࣦC modified electrode showed the highest current density compared to the bare carbon (C) and CNTࣦC electrodes, including the modified PB-CࣦC. For this reason, the highest detection and quantification limits were obtained using PB-CNTࣦC with 13.1 and 43.7 µmol L−1, respectively. The different modified and bare electrodes were characterized by electrochemical, spectroscopically, and microscopically methods, where the electronic transference using a probe molecule showed a quasi-reversible behavior in different cases, with the PB presence by cube shape in order of the number of cycles indicating a 3D growth. Additionally, these electrodes were probed for the electrochemical detection of sodium in a synthetic aqueous media. In aqueous samples from soil extracts, these results showed that they are competitive with other analytical methods, such as flame atomic absorption, by the similarity of the sodium concentrations obtained. They look attractive for use in the field of detection of sodium. It is worth noting that this is the first time that this type of surface and electrodes have been used for sodium detection, compared to the existing ones based on the same methodology in the detection of Na+ at lower concentrations. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] • Oxidation resistance of MICs under redox conditions was analyzed in detail. • Strategies for reduced resistance and enhanced Cr-barrier property were proposed. • Typical SOFC stacks were illustrated, focusing on key features and performance. • Economic feasibility of SOFC/SOEC applications was discussed. As a crucial component in SOFC stacks, the interconnector electrically connects adjacent single cells while physically separating the fuel from the oxidant gas. Recent advances in intermediate-temperature SOFCs have enabled the use of more cost-effective metallic interconnectors. This review highlights recent progress and practical applications of high-performance SOFC interconnectors, outlining strategies to enhance device efficiency and long-term stability. It offers a comparative discussion on the barrier properties of protective coatings, including Mn-Co-based, Mn-Cu-based, and Fe-containing spinels, particularly when modified with doping strategies. Additionally, it summarizes fabrication technologies for effective protective coatings, such as screen printing with a two-step process, thermal spraying dispensing with post-treatment, magnetron sputtering, and electrophoretic deposition suitable for complex substrates. The oxidation behaviors of coated interconnectors under reducing and oxidizing atmospheres, as well as in real stack operating conditions, are thoroughly examined. Afterwards, comprehensive comparative analysis of the current market demands and economic feasibility was carried out for SOFC/SOEC applications. Finally, it discusses current challenges and future prospect, aiming to support the broader application and commercialization of SOFC stacks, particularly lightweight porous metal-supported SOFCs. [ABSTRACT FROM AUTHOR]

A wearable visual pH sensor was successfully fabricated, showcasing high color sensitivity, robust cyclic stability, and exceptional color fastness. [Display omitted] • Heterocyclic azo dye with two D–π–A system was successfully synthesized. • The synthesized dye exhibits distinct chromatic variations in response to different pH values. • Colorimetric fabric sensors have been successfully prepared to monitor the pH value of sweat. • The fabric sensors exhibited exceptional color fastness against washing, rubbing, and sunlight exposure. The pH value of human sweat serves as a crucial biomarker for disease diagnosis, rendering wearable sweat sensors an innovative tool for monitoring human health. However, the commercialization of these devices is seriously impeded by their low sensitivity, poor wearing comfort, and limited reusability. In this work, a reactive dye capable of color change under pH change has been synthesized. Due to the unique molecular structure, the dye molecule exhibits remarkable color change recognition and high sensitivity. To fabricate a wearable pH sensor, screen printing technology was employed for depositing the color-changing dye onto cotton fabric. The resulting sensor demonstrated excellent performance attributes including high color sensitivity, robust cyclic stability in response to pH changes, and exceptional resistance against washing, friction, and sunlight-induced fading. Therefore, this study presents a highly promising approach for achieving real-time monitoring of human sweat pH levels. [ABSTRACT FROM AUTHOR]

Curved high-temperature applications, such as aircraft engine turbine blades and automobile engine exhausts, require accurate and rapid temperature measurements. Despite this need, preparing thin-film temperature sensors on complex curved surfaces remains challenging. It is hypothesized that a flexible screen-printing-based method can effectively fabricate conformal high-temperature sensors on such surfaces. In this study, a method using carbon dioxide laser scanning is employed to carbonize one-sided adhesive polyimide (PI) thin-film tapes, creating flexible stencils. The investigation focuses on the effects of laser power, scanning speed, and the number of scans on the morphology of PI stencil mesh edges, as well as examining the influence of PI stencil thickness and scanning width on mesh dimensions. Optimal laser process parameters are identified for producing stencils with clear mesh edges across various thicknesses. The results demonstrate that the fabricated curved high-temperature thin-film temperature sensors exhibit excellent reproducibility and stability, enduring temperatures up to 900 °C. It is concluded that this process not only enables the production of high-performance PDC thin-film temperature sensors but also extends to other high-temperature sensors and flexible electronic devices. • PI stencils were produced using CO2 laser scanning, with optimized settings to ensure clear mesh edges. • A screen-printing process was used to create high-temperature sensors on curved surfaces with strong reproducibility. • Thin-film sensors on curves endured up to 900 °C, showing excellent stability and reliable performance. [ABSTRACT FROM AUTHOR]

[Display omitted] • 2D-2D FeVO 4 decorated Ti 2 C 3 MXene heterojunctions was synthesized via ultrasonic processing. • FeVO 4 @Ti 3 C 2 heterojunctions was employed as an effective biosensor for (5-HT) detection. • A 4-fold higher current density value was noted in FeVO 4 @Ti 3 C 2 heterojunctions. • FeVO 4 @Ti 3 C 2 MXene reveals a lower detection limit of 5.88 nM. • The biosensor displays a good sensing stability and an anti-interferent ability. Serotonin (5-HT) is a neurotransmitter involved in various pathological and physiological processes. The development of novel electrochemical sensor is of significant interest for effective measurement of 5-HT in pharmaceutical and disease diagnosis applications. In this work, two-dimensional iron vanadate nanoflakes (FeVO 4 NFs) supported on Ti 3 C 2 MXene hybrid nanocomposites was fabricated for the ultrasensitive and highly selective electrochemical detection of (5-HT). The morphology and crystalline phase of the as-synthesized nanocomposites was analyzed by various characterization techniques. The morphological studies of the hybrid nanocomposites reveals that FeVO 4 NFs are uniformly decorated on the Ti 3 C 2 MXene surface. Differential pulse voltammetry (DPV) and cyclic voltammetry (CV) characterization of FeVO 4 @Ti 3 C 2 MXene on screen printed carbon electrode (SPCE) exhibits enhanced electrochemical activity towards 5-HT oxidation. Under optimized conditions, FeVO 4 @Ti 3 C 2 MXene (SPCE) reveals a linear concentration of 25 to 750 nM, with a detection limit of 5.88 nM towards the determination of (5-HT) and the calculated sensitivity of 3.0 μA μM−1 cm−2. In addition, the fabricated electrochemical biosensor delivers excellent stability, selectivity and reproducibility with the existence of interfering active compounds enabling the detection of 5-HT. Furthermore, the FeVO 4 @ Ti 3 C 2 MXene (SPCE) biosensor displays satisfactory results in real sample analysis such as human serum. [ABSTRACT FROM AUTHOR]

Food additives enhance sensory pleasure and improve marketability in food product formulations, yet their potential health risks are highly consequential. Tertiary butylhydroquinone (TBHQ), in this regard, has a controversial reputation owing to its neurotoxic effects, which include convulsions and other chronic issues. This situation underscores the need for an advanced electrochemical sensing platform. The current study advocates the utilization of copper tungstate nanoparticles to enhance the sensitivity, selectivity, and efficiency in TBHQ detection, thus addressing the challenges posed by the excessive use of additives and safeguarding the integrity of the food supply chain. Hydrothermally synthesized CuWO 4 nanoparticles exhibited superior physicochemical and morphological characteristics, bringing about wide linear response ranges (0.01 to 789 μM), high selectivity, excellent anti-interference capabilities, and a low detection limit of 0.9 nM (S/N = 3). The CuWO 4 modified screen printed carbon electrode (SPCE) presents promising recovery ranges in food samples, facilitating real-time monitoring and streamlining the quality assessment of food additives. [Display omitted] • Facile synthesis of CuWO 4 nanoparticles using hydrothermal method. • Electrochemical detection of Food Additive- TBHQ using CuWO 4 /SPCE. • Proposed sensor exhibited LOD and wide linear ranges towards CuWO 4 /SPCE. • Practicality of fabricated sensor in spiked TBHQ in milk and edible oil food samples. [ABSTRACT FROM AUTHOR]

• A portable quantitative detection system for oxytetracycline antibiotic. • OTC biosensor made up of aptamer modified screen printed electrodes. • Designed and developed a custom made cyclic voltammograph. • For milk, chicken and pork meats obtained an OTC LOD: 16.86, 30.27 and 24.25 μg/L. • Detection system current is inversely related to OTC presence and dose. [ABSTRACT FROM AUTHOR]

• The disposable screen-printed electrodes were designed to detect DCP, enabling rapid assessment of this biomarker. • This experiment uses screen ink printing electrode, which can effectively control the contact area of the electrode. • Flower-like gold nanoparticles were produced on the surface of ITO electrode by electrodeposition. A multi-signal amplification system using an ITO electrode printed with disposable screen ink was developed for the rapid detecting des-gamma-carboxy prothrombin (DCP). Gold nanoparticles, uniformly shaped, were electrodeposited on the ITO electrode to improve conductivity and biocompatibility. To boost the sensor's sensitivity, isoreticular metal–organic framework-3 (IROMF-3) and methylene blue (MB) were employed to expand the electrode's surface area and intensify the current signal. Additionally, the avidin-loaded silver nanoelectrode, capable of binding more biotinylated DCP antibodies, further heightened sensitivity. The developed immunosensor effectively detected trace DCP in serum, with a linear range of 0.31 ng/mL to 40 ng/mL, a detection limit of 0.138 ng/mL, and a recovery rate of 97.9–109.2 % under optimal experimental conditions. This study offers a promising approach for the rapid field detection of trace DCP in serum. [ABSTRACT FROM AUTHOR]

• Fast preparation of tungsten-rhenium thick film thermocouple using screen printing technology. • The tungsten-rhenium thick film thermocouple can operate at temperature up to 1600 °C. • The tungsten-rhenium thick film thermocouple have a full-scale accuracy better than 1.5 % and repeatability better than 0.9 %. Tungsten-rhenium thick film thermocouples (TFTCs) show excellent potential for in-situ high-temperature monitoring due to their high-temperature resistance. However, the only reported method for preparing tungsten-rhenium thin film thermocouples is magnetron sputtering. The upper limit of temperature resistance of thetungsten-rhenium thin film thermocouples prepared by this method is low because the thickness is reduced by continuous thermal ablation at high temperatures. In this work, screen printing technology is used to prepare tungsten-rhenium TFTCs. The tungsten-rhenium TFTCs' temperature accuracy is better than ±1.5 %, repeatability is better than 0.9 %, and drift is only 0.26 %/h at 1600 °C. Finally, the tungsten-rhenium TFTC temperature ring array is installed in a tubular furnace for high-temperature monitoring, and the tungsten-rhenium TFTC is heated in the air using a high-temperature flame gun at approximately 1000 °C for up to 30 s. This method to fabricate tungsten-rhenium TFTCs has the potential for temperature measurement in extremely harsh environments. [ABSTRACT FROM AUTHOR]

[Display omitted] • Preparation of new perovskite materials for electrochemical energy storage. • Screen-printed LaFeO 3 perovskite for the next generation of supercapacitors. • Enhancement of energy storing by surface coating of LaFeO 3 with PEDOT:PSS. • Influence of sintering temperature of LaFeO 3 on enhanced energy storage device. • LaFeO 3 modified with PEDOT: PSS exhibited a specific capacitance of 12.01 mF∙cm−2. Developing advanced smart energy storage devices demanded new functional materials to store energy effectively and deliver power quickly. In this work, we studied the energy-storing performance of perovskite material, lanthanum ferrite (LaFeO 3), prepared by the solid-state reaction method. The screen-printed LaFeO 3 and graphite electrodes are used to develop hybrid supercapacitors (HSCs) with KOH electrolyte. Varying the sintering temperature of the LaFeO 3 perovskite electrode (800 °C, 900 °C, and 1000 °C) leads to changes in the surface and crystalline properties, which impact the electrochemical properties and overall energy-storing performance of the HSC. The surface of the LaFeO 3 electrode is modified with organic conducting polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS), which enhances the energy storage of the HSC. The developed HSC based on LaFeO 3 , sintered at 1000 °C and surface modified with PEDOT: PSS, exhibited a specific capacitance of 12.007 mF∙cm−2 at a current density of 0.075 mA∙cm−2. This value is two times higher than (5.874 mF∙cm−2) without the surface modification of LaFeO 3 at 1000 °C. This study provides valuable insights into the electrochemical performances of the ABO 3 perovskite (LaFeO 3) electrodes for the next generation of portable energy storage devices. [ABSTRACT FROM AUTHOR]

Solid-contact ion-selective electrodes present tools for rapid assessment of charged species within a vast number of samples. Commercially available point-of-care electrochemical sensing systems are most often produced by screen-printing. However, this method is not applicable to polymeric membrane deposition, due to the mismatch of the membrane physical characteristics to those intended for screen printing. Herein, an industrial automated dispensing machine was used for fast and controlled deposition of small volumes of ion-selective membrane. Compared to the previously published literature, the dry solute membrane content was not altered. Rather, we optimized the solvents for the ISM preparation, thus significantly lowering the required overall number of membrane deposition steps. It was shown that dry membrane uniformity strongly depends on the solvent carrier system, with the best uniformity for the membrane prepared in a solvent mixture consisting of equal volumes of THF and cyclohexanone. The volume of a single membrane deposit (spot) was estimated based on colorimetric absorbance measurements to be 0.20 μL. Already with a single spot of the ion-selective membrane, an adequate potentiometric response to potassium ions was obtained, supporting the efficiency of the production technique. Evaporative membrane drying was investigated for the first time using time-resolved impedance spectroscopy, giving useful information on the influence of the solvent composition to the characteristics of the evaporative time profiles. With this approach, the overall production and drying of the described devices takes less than 30 min. [Display omitted] • Ion-selective membrane composition was optimized for automated spotting. • A 1:1 THF:cyclohexanone solvent mixture gives uniform membranes. • Drying times were determined by time-resolved impedance measurements. • 0.4 µL of the membrane cocktail gives a stable Nernstian potentiometric response. [ABSTRACT FROM AUTHOR]

The Canadian Medical Association Journal (CMAJ) will reduce its print publication frequency to 6 times a year starting in 2025, aiming to decrease paper and postal service usage by 40%. Despite the shift towards digital formats, a survey revealed that 83% of print readers prefer the tangible experience of reading the journal. The decision to reduce print issues reflects a balance between fiscal responsibility and environmental sustainability, aligning with the CMA's commitment to a net-zero health care system. [Extracted from the article]

The excessive consumption of liquor accounts for 5.3 % annual death and indole-3-lactic acid has been identified as a possible biomarker for mentally disorder patients arising from alcohol abuse. A highly sensitive and selective voltammetric sensing platform is proposed composed of N-doped core-shell Ir@Mo@Ni aerogel prepared via a facile in situ spontaneous gelation route using one-step NaBH 4 reduction technique anchored on a cost-effective screen-printed carbon electrode (SPCE) for determination of indole-3-lactic acid (ILA) levels in buffer and serum. Prior to the analytical phase, the composite (N-Ir@Mo@Ni/SPCE) was thoroughly characterized, and different methods were used to investigate the electrochemical properties. The combination of tri-metallics resulted in improved sensing capacities in the linear range from 0.01–20 µM, with sensitivity and limits of detection of 0.162 μA/μM and 7.2 nM, respectively, towards ILA determination. Furthermore, the developed sensing platform was utilized for the analyses of ILA in human normal and alcohol use disorder patients' serum samples. Liquid chromatography in tandem with mass spectrometry was equally used to quantify ILA levels in the serum samples and the results of both methods were compared. [Display omitted] [ABSTRACT FROM AUTHOR]

With the combination of carbon quantum dots (CDs) and rare earth-doped fluorescent materials, multi-mode luminescence can be achieved in fluorescent ink, thereby enhancing its anti-counterfeiting security coefficient. However, the self-quenching process in CDs currently hinders their application in the field of anti-counterfeiting. In this study, we employed simple chemical method to prepare the SiO 2 -encapsulated YVO 4 :Eu3+/CDs nanocomposites, which greatly improved the stability of the composite and achieved dual-mode solid-state luminescence. Quick response code anti-counterfeiting patterns were fabricated using screen printing technology, and dual-mode luminescence performance with red and blue emission was achieved under excitation at 254 nm and 365 nm respectively. The YVO 4 :Eu3+@SiO 2 @CDs nanocomposites showed stable dual-mode luminescent performance in both solid-state and solvent environment, demonstrating great potential in anticounterfeiting and information protection application. • The YVO 4 : Eu3+ nanocrystals combining with CDs by introducing a silica layer as intermediate medium was developed. • The novel YVO 4 :Eu3+@SiO 2 @CDs composite improved the dispersibility of CDs and achieved solid-state luminescence. • The YVO 4 :Eu3+@SiO 2 @CDs showed stable dual-mode luminescent performance in both solid-state and solvent environment. [ABSTRACT FROM AUTHOR]

The limited utilization rate of dyes for coloring coupled with the consumption of large quantities of chemical reagents, can result in acute environmental pollution and waste of resources. Herein, in accordance with the electrostatic attraction between electropositivity of chitosan and anionic dyes, a novel type of chitosan-modified cationic polystyrene nanospheres (PSCS) was creatively synthesized, which can be innovatively employed as a special carrier with an adsorption capacity of up to 197.4mg/g for acid dyes. Consequently, a exclusive pigment identified as colored chitosan-modified polystyrene composite dye nanospheres (PSCS(AR9)) was procured. Simultaneously, the binder-free printing was accomplished by leveraging the intrinsic self-curing property of PSCS(AR9) for screen printing of textiles. Additionally, printed fabrics with PSCS(AR9) exhibited superb darkening effect (the K/S value can be increased by 2 times.) in conjunction with significantly improved hand feel in contrast with the conventional printed fabrics. The last but not least, the rubbing fastness of the printed fabrics using PSCS(AR9) can meet demand of the practical application. Therefore, this work may provide an innovative insight for constructing a new type of environmentally friendly and depth-enhanced printed textile. [Display omitted] • Chitosan-modified polystyrene nanospheres show a superb dye absorption capacity. • The cotton fabrics printed with colored nanospheres prove enhanced color depth. • Binder-free printing is achieved without compromising fastness. [ABSTRACT FROM AUTHOR]

• Development of an eco-friendly electrochemical textile-based sensor using recycled polyester and hemp fibers. • Textile-based SPE shows better electrochemical behavior and 1.58% RSD for 20 measurements, outperforming commercial SPEs. • Natural, renewable, cost-effective material, compatible with health applications and easy integration into wearables. • Sustainable materials reduce the environmental impact of discarded SPEs, promoting sustainability in point-of-care devices. • Offers flexibility and comfort for continuous health monitoring while maintaining high electrochemical performance. Electronic sensors are essential in applications like biosensors and fuel cells, providing rapid solutions for substance detection. Integrating electrochemical sensors into textiles offers advantages such as flexibility, comfort, and potential for wearable applications. This study explores the suitability of three textile substrates—100 % polyester knit mesh (S1), 100 % recycled polyester knit mesh (S2), and 50 % recycled polyester/50 % hemp fabric (S3)—for constructing screen-printed electrodes (SPEs). The goal is to develop a textile-based electrochemical sensor with a 3-electrode system (reference, auxiliary, and working electrode) using semi-automated screen printing. The electrochemical performance of two carbon inks, Elantas 9553 and DuPont BQ242, was evaluated to select the best working electrode (WE) ink. DuPont BQ242 was found most suitable for WE production, exhibiting quasi-reversible behavior and temperature stability. The electrochemical behavior of the textile-SPEs printed with DuPont BQ242 revealed that substrate S3 had superior properties, with higher peak currents (peak current ratio of 1.2) and smaller peak potential separation (602 n/V). Carbon Elantas 9553 was more sensitive to temperature changes (1 % variation) than the more stable DuPont BQ242 (0.03 % variation). The stability of the inks on substrates was examined using the 4-point probe method, highlighting excellent electrical stability under UV, high temperatures, cosmetics, and artificial sweat. The final textile-based SPE outperformed commercial SPEs, showing superior redox properties, with a peak potential separation (ΔEp) 56 % smaller and a relative standard deviation (RSD) of 1.58 % over 20 measurements. These textile-based SPEs present a valuable alternative to conventional rigid sensors, which are typically single-use and less durable. [ABSTRACT FROM AUTHOR]

As non-contact sensing, non-invasive medical diagnostics and environmental humidity monitoring technologies advance, the demand for high-performance humidity sensors is becoming increasingly apparent. Ti 3 C 2 T x MXene is an attractive humidity-sensitive candidate due to its excellent chemical activity and hydrophilic surface. However, achieving fast responsiveness and high sensitivity of dynamic changes in humidity is still challenging. Herein, this work introduced a WS 2 -modified Ti 3 C 2 T x MXene composite material as humidity sensing material with superior sensing performance. Then sodium carboxymethyl cellulose solution was added to the Ti 3 C 2 T x MXene/WS 2 composite material to adjust viscosity of the composite material, enabling the formulation of printable humidity-sensitive ink. Utilizing screen-printing technology, a mass-producible humidity sensor (CMXW2) was successfully fabricated. Experimental results show that the sensor has short response and recovery times of 4.65 s/1.33 s in the relative humidity of 11–97 % with a high humidity response of 1707 % and excellent mechanical properties. The efficacy of the humidity sensor for skin moisture monitoring, real-time respiration monitoring, and non-contact switch was also evaluated. The successful demonstration of multi-scenario applications using the CMXW2 humidity sensor opens up new possibilities and applications in the fields of smart healthcare and non-contact sensing. [Display omitted] • WS 2 nanosheets successfully modified the surface of MXene. • The flexible humidity sensor was fully printed and suitable for mass production. • The CMXW2 humidity sensor showed fast response/recovery speed and high sensitivity. • The CMXW2 humidity sensor opened up new possibilities in smart healthcare. [ABSTRACT FROM AUTHOR]