Recent research situation in tin dioxide nanomaterials： synthesis, microstructures, and properties

This review article summarizes the new research in solid-state physical chemistry understanding of the microstructure characteristics of semiconductor tin oxide thin films made in the last years in our group. The work mainly focuses on the fabrication technology of semiconductor tin oxides thin films by using pulsed laser deposition （PLD） as well as the application of this technology on new micro- and nanostructured materials. It is an interdisciplinary work that integrates the areas of physics, chemistry and materials science.

Highly flexible,mechanically strengthened metallic glass-based composite electrode with enhanced capacitance and cyclic stability

The design of flexible composite electrodes has become the top priority in energy storage devices for the development of future wearable intelligent electronics.However,searching for fully integrated,ultrathin flexible composite electrodes with satisfying electrochemical performance is still a major challenge.Herein,we introduce a nanoporous gold metallic glass(MG) ribbon-based composite electrode with excellent electric conductivity,mechanical flexibility,and extra capacitance by integrating polypyrrole(PPy) into wrinkled nanoporous ribbon(NPG@MG).The freestanding,ultrathin,highly conductive and flexible" nature of the composite electrode prevents the conducting polymer from structural instability resulting from the volume swell and shrink during the charging/discharging circulation,and the packed PPy provides protection for the wrinkled topology on the surface of the MG ribbon.The capacitance of pure NPG@MG-PPy composite electrode reached 393 mF·cm^(-2).The ultra-thin all-solid-state flexible supercapacitor demonstrates an excellent capacitance of 172 mF·cM^(-2)(14.8 F·cm^(-3)),accompanied by a superior cycling capability after 8000 charge/discharge cycles attributed to mechanical flexibility.The areal energy density also reached 0.74 mWh·cm^(-3)(9μWh·cm^(-2)) at a power density of 1 μW·cm^(-2).This work provides valuable concepts on the design of PPy-based hybrid materials for flexible energy storage systems with greatly enhanced electrochemical performances.

Bioinspired mineral MXene hydrogels for tensile strain sensing and radionuclide adsorption applications

MXene-based hydrogels have drawn considerable attention as flexible and wearable sensors.However,the application of MXene-based hydrogels after sensing failure has rarely been investigated,which is of great significance for expanding their engineering application.In this work,multifunctional mineral MXene hydrogels(MMHs)were synthesized via a simple method inspired by biomineralization.The prepared MMHs were stretchable,self-healable and conductive,and can be used to fabricate wearable tensile strain sensors showing a super-wide sensing range with excellent sensitivity.MMHs-based strain sensors were designed to be directly attached to the skin surface to detect tiny and large human motions.In addition,with the advantages of a large specific area,excellent hydrophilicity and abundant active adsorption sites for MXene nanosheets and hydrogels,dehydrated MMHs were used as highly efficient adsorbents for the removal of strontium ions from aqueous solutions.This work shows the great potential of MXene in promoting the development of nextgeneration functional materials.

Steady-state property and dynamics in graphene-nanoribbon- array lasers

In this work, we present a schematic configuration and device model for a graphene-nanoribbon （GNR）-array-based nanolaser, which consists of a three-variable rate equations that takes into account carrier capture and Pauli blocking in semiconductor GNR-array lasers to analyze the steady- state properties and dynamics in terms of the role of the capture rate and the gain coefficient in GNR array nanolasers. Furthermore, our GNR-array nanolaser device model can be determined as two distinct two-variable reductions of the rate equations in the limit of large capture rates, depending on their relative values. The first case leads to the rate equations for quantum well lasers, exhibiting relaxation oscillations dynamics. The second case corresponds to GNRs nearly saturated by the carriers and is characterized by the absence of relaxation oscillations. Our results here demonstrated that GNR-array as gain material embedded into a high finesse microcavity can serve as an ultralow lasing threshold nanolaser with promising applications ranging widely from optical fiber communi- cation with increasing data processing speed to digital optical recording and biology spectroscopy.