Encapsulating enzyme into metal-organic framework during in-situ growth on cellulose acetate nanofibers as self-powered glucose biosensor

Two-dimensional MXenes have been extensively investigated in recent years and have resulted in the discovery of more than 30 compositions. The metallic conductivity and pseudocapacitive behavior of MXenes have demonstrated their exciting potential in electrochemical energy storage and conversion, electromagnetic shielding, wearable sensors, and personal thermotherapy. Driven by the surface termination functional groups, versatile chemistry, and outstanding solubility, MXenes have been integrated with various flexible and nanoporous substrates for wearable nanodevice applications. However, the available review mostly focuses on different substrates for multifunctional applications. No review intended for wearable nanodevices with a special focus on the breathability and comfort has been reported to date. In this review, we summarized the synthesis processes and their impact on MXene properties, and the structure–property relationship of MXenes. The current progress in MXene integration processes is comprehensively summarized and analyzed. We explored and evaluated the energy harvesting and storage, electromagnetic shielding, joule heating, as well as strain and pressure sensing applications. A brief overview of humidity and gas sensing of the MXene-based nanostructure is provided. Besides, the current challenges and perspectives in these burgeoning fields are highlighted for the development of wearable nanodevices.

Two-dimensional MXene-based flexible nanostructures for functional nanodevices: a review

The effect of etching environment (opened or closed) on the synthesis and electrochemical properties of V2C MXene was studied. V2C MXene samples were synthesized by selectively etching of V2AlC at 90 °C in two different environments: opened environment (OE) in oil bath pans under atmosphere pressure and closed environment (CE) in hydrothermal reaction kettles under higher pressures. In OE, only NaF (sodium fluoride) + HCl (hydrochloric acid) etching solution can be used to synthesize highly pure V2C MXene. However, in CE, both LiF (lithium fluoride) + HCl and NaF+HCl etchant can be used to prepare V2C MXene. Moreover, the V2C MXene samples made in CE had higher purity and better-layered structure than those made in OE. Although the purity of V2C obtained by LiF+HCl is lower than that of V2C obtained using NaF+HCl, it shows better electrochemical performance as anodes of lithium-ion batteries (LIBs). Therefore, etching in CE is a better method for preparing highly pure V2C MXene, which provides a reference for expanding the synthesis methods of V2C with better electrochemical properties.

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Synthesis and electrochemical properties of V 2 C MXene by etching in opened/closed environments

A review on the current research on microwave processing techniques applied to graphene-based supercapacitor electrodes: An emerging approach beyond conventional heating

Although supercapacitors attract tremendous attention due to their high power density, long cycle life, and high efficiency, it is still a challenge to prepare flexible and wearable supercapacitors...

Flexible Poly(vinyl alcohol)–Polyaniline Hydrogel Film with Vertically Aligned Channels for an Integrated and Self-Healable Supercapacitor

One-step wet-spinning assembly of twisting-structured graphene/carbon nanotube fiber supercapacitor

Flexible visible-light-driven photoelectrochemical biosensor based on molecularly imprinted nanoparticle intercalation-modulated graphene fiber for ultrasensitive urea detection

Bamboo derived SiC ceramics-phase change composites for efficient, rapid, and compact solar thermal energy storage

Functional phase-change fabrics hold great promise as wearable clothing. However, how to enable a phase-change fabric with the combined features of excellent structural flexibility and robustness, integrated multifunctionality, superior stability, and durability, as well as facile and scalable manufacturing, still remains a significant challenge. Herein, we demonstrated a scalable and controllable three-dimensional (3D) printing strategy for manufacturing flexible, thin, and robust phase-change nonwoven fabric (PCNF), with abundant and regular breathable pores as well as uniform and tight embedment of highly interconnected single-walled carbon nanotubes (SWNTs) into hydrophobic filaments built by intertwining solid-solid phase-change polymer chains together. The remarkable architectural features enabled an integral whole of the fabric, ready air exchange, superior water impermeability, highly efficient heat harvesting and storage, and effective absorption and reflection of electromagnetic waves, thereby delivering an exceptional combined function of breathability, waterproofness, thermal regulation, and radiation resistance, and meanwhile featuring superior thermal stability and outstanding resistance to stretching/folding fatigue even at cycles up to 2000. This work sheds light on effective strategies for manufacturing wearable phase-change fabrics with multifunctionality and high stability in a scalable manner toward future uses.

Ping Li

Papers

One-step wet-spinning assembly of twisting-structured graphene/carbon nanotube fiber supercapacitor

Flexible visible-light-driven photoelectrochemical biosensor based on molecularly imprinted nanoparticle intercalation-modulated graphene fiber for ultrasensitive urea detection

Bamboo derived SiC ceramics-phase change composites for efficient, rapid, and compact solar thermal energy storage

3D-Printed Flexible Phase-Change Nonwoven Fabrics toward Multifunctional Clothing.

3d Printing of Carbon Tile-Modulated Well-Interconnected Hierarchically Porous Pseudocapacitive Electrode