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Recently, ternary cobalt nickel sulfide, performing as the promising electrode material for supercapacitors has obtained great interests. Herein, the hollow and spinous NiCo

MXenes are a new family of 2 D transition metal carbides and nitrides, which have attracted enormous attention in electrochemical energy storage, sensing technology, and catalysis owing to their good conductivity, high specific surface area, and excellent electrochemical properties. In this work, a series of Co3 O4 -doped 3 D MXene/RGO hybrid porous aerogels is designed and prepared through a facile in situ reduction and thermal annealing process, in which the reduced graphene oxide (RGO) conductive network can electrically link the separated Co3 O4 -MXene composite nanosheets, leading to enhanced electronic conductivity. It is found that upon using the Co3 O4 -MXene/RGO hybrid porous aerogel prepared with a mass ratio of Co3 O4 -MXene/RGO of 3:1 (CMR31) as an electrode for a supercapacitor, a superior specific capacitance of 345 F g-1 at the current density of 1 A g-1 is achieved, which is significantly higher than those of Ti3 C2 Tx MXene, RGO, and MXene/RGO electrodes. In addition, a high capacitance retention (85 % of the initial capacitance after 10 000 cycles at a high current density of 3 A g-1 ) and a low internal resistance Rs (0.44 Ω) can be achieved. An all-solid-state asymmetric supercapacitor (ASC) device is assembled using CMR31, and it has the ability to light up a blue LED indicator for 5 min if four ASCs are connected in series. Therefore, these novel Co3 O4 -MXene/RGO hybrid porous aerogels have potential practical applications in high-energy storage devices.

In this review, we focus on recent advances in the synthesis of polymer-functionalized transition-metal-based nanomaterials and follow this up by discussing their applications in bioimaging diagnosis and cancer therapy. Transition-metal-based nanomaterials show great potential in cancer therapy owing to their intensive near-IR absorption, excellent photothermal conversion efficiency, strong X-ray attenuation, and magnetic properties. Functional polymers are usually introduced by a one-step or multistep method to further endow these nanomaterials with great biocompatibility and physiological stability. Polymer-decorated transition-metal nanomaterials show great potential in multimodal imaging diagnosis (photoacoustic imaging, computed tomography, photoluminescence imaging, positron emission tomography, etc.) and cancer therapy (chemotherapy, photothermal therapy, microwave therapy, radiotherapy, photodynamic therapy). At the end of this review, the prospects of these polymer-decorated transition-metal-based nanomaterials are also discussed.

Graphene, as a new emerging carbon material, has attracted significant attention due to its remarkable properties, such as excellent electrical and thermal conductivity, fast mobility of charge carriers, high fracture strength, and large specific surface area. As the most promising carbonaceous nanofillers, graphene-based nanocomposite fibers have promoted the fast development of fibrous materials for emerging applications in need of superior mechanical, thermal, electrical, optical, antibacterial, or adsorption performance. In this comprehensive chapter, the commonly applied strategies to prepare and modify graphene and graphene-reinforced polymer fibers are briefly introduced. Then, the properties of the graphene/polymer nanocomposite fibers are summarized and discussed in detail, including mechanical properties, electrical conductivity, thermal properties, and other properties. Finally, the applications of the graphene/polymer nanocomposite fibers are also highlighted in brief.

Molybdenum disulfide (MoS

Promoted by recent advances in developing nanomaterials and drug delivery, stimuli-responsive polymer systems that can remotely trigger drug release in a spatiotemporal manner has attracted significant attention in biotechnology. Implementation of remote-controlled release requires functional polymers to be susceptible to specific physical and/or chemical stimuli. In this minireview, we focus on the recent advances in the construction of stimuli-responsive polymer systems for remotely controlling drug release in response to an externally applied stimulus (light, microwave, magnetic field, electric field and ultrasound). The design of the stimuli-responsive polymer systems and formulations to remotely control the release of drug molecules is also highlighted in this minireview. Furthermore, the potential in biomedical applications and the perspectives of future developments of these stimuli-responsive polymer systems are also briefly discussed.

The hierarchical nanostructure hybrids of porous Co3O4 nanowires coated NiMn layered double hydroxide nanosheets array on Ni foams (Co3O4@NiMn-LDH/Ni) are designed and prepared via the two-step hydrothermal reactions with a combination of annealing process. The Co3O4 nanowires can be utilized as backbone to grow the NiMn-layered double hydroxide (NiMn-LDH) nanosheets, which provide a large surface area and leading to the enhanced capacitive performance owing to the effective ion/electron diffusion rates. The areal capacitance of the as-prepared Co3O4@NiMn-LDH/Ni electrode reaches 19.7 F cm−2 (5419.7 F g−1) at 2 mA cm−2 (0.56 A g−1). Moreover, a high capacitance retention (93.25% of capacitance maintained after 6000 cycles) and a low internal resistance Rs (0.62 Ω) can be acquired. Additionally, an all-solid-state asymmetric supercapacitor (Co3O4@NiMn-LDH/Ni//AC ASC) based on the Co3O4@NiMn-LDH/Ni as positive electrode and activated carbon (AC) as negative electrode is successfully obtained. The Co3O4@NiMn-LDH/Ni//AC ASC shows a high energy density of 47.15 Wh kg−1 at 376 W kg−1. Additionally, a LED can be lit up for 12 min when three ASCs are connected in series. Therefore, this novel Co3O4@NiMn-LDH/Ni with outstanding electrochemical performance should envision potential practical applications in high energy storage appliances.