Mechanically exfoliated MoS_(2) nanosheets decorated with SnS_(2) nanoparticles for high-stability gas sensors at room temperature  

作　　者：Jia-Bei Liu Jin-Yong Hu Can Liu Yu-Ming Tan Xiang Peng Yong Zhang 

机构地区：[1]School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China [2]Hunan Institute of Advanced Sensing and Information Technology,Xiangtan University,Xiangtan 411105,China

出　　处：《Rare Metals》2021年第6期1536-1544,共9页稀有金属（英文版）

基　　金：financially supported by Hunan Provincial Natural Science Foundation of China(No.2018JJ2404);the Scientific Research Foundation of Hunan Provincial Education Department(Nos.19A475 and 19C1739);Hunan Science and Technology Plan Program(No.2019RS1056)。

摘　　要：Due to its unique physical,chemical and surface electronic properties,molybdenum disulfide(MoS_(2))nanosheets open up a new avenue for nitrogen dioxide(NO2)detection at room temperature.Nevertheless,the gas sensing properties of pure MoS_(2) nanosheets are inevitably degenerated by the adsorption of atmospheric oxygen,which results in weak stability for MoS_(2)-based gas sensors.Reducing surface defects and constructing heterojunctions may be effective strategies to improve the gas sensing properties of MoS_(2) nanosheets.In this work,we design a novel nanocomposite based on MoS_(2) nanosheets decorated with tin disulfide(SnS_(2))nanoparticles(MoS_(2)/SnS_(2))via combining the mechanical exfoliation method with the facile hydrothermal method.The experimental results indicate that,after surfaces decoration with SnS_(2) nanoparticles,the as-prepared gas sensor based on MoS_(2)/SnS_(2) nanocomposites exhibits reliable long-term stability with the maximum response value drift of less than 3%at room temperature.Moreover,the MoS_(2)/SnS_(2) sensor also possesses desirable gas sensing properties upon NO_(2) at room temperature,such as high sensitivity,rapid response/recovery speed(28 s/3 s,5×10^(-6) NO_(2)),satisfactory selectivity,favorable repeatability and reversibility.The improved gas sensing properties of MoS_(2)/SnS_(2) nanocomposites can be attributed to the unique electronic properties of MoS 2 nanosheets with the fewer layers structure and the competitive adsorption effect of SnS_(2) nanoparticles.This work elucidates that SnS_(2) nanoparticles serving as an effective antioxidative decoration can promote the stability of MoS_(2) nanosheets,providing a promising approach to achieve high-stability NO2 gas sensors at room temperature.

关 键 词：Mechanically exfoliated MoS2 nanosheets MoS_(2)/SnS_(2)nanocomposites NO2 sensing properties Room-temperature detection 

分 类 号：X831[环境科学与工程—环境工程] TB383.1[一般工业技术—材料科学与工程]