溶剂热法制备硒化钨纳米花及其气敏性能研究  

Study on preparation of flower-like WSe_(2) nanomaterial by solvothermal method and its gas sensing properties

作　　者：桂阳海 王幸辉 田宽 钱琳琳 Gui Yanghai;Wang Xinghui;Tian Kuan;Qian Linlin(College of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China)

机构地区：[1]郑州轻工业大学材料与化学工程学院,河南郑州450002

出　　处：《无机盐工业》2021年第5期47-50,77,共5页Inorganic Chemicals Industry

基　　金：国家自然科学基金资助项目(21371158,U1904213,U20041102);河南省科技攻关项目(202102210260)。

摘　　要：以N,N-二甲基甲酰胺为分散剂,亚硒酸钠和钨酸钠为原料,采用溶剂热法制备了由超薄二维层状纳米片堆叠而成的花状硒化钨纳米材料,并研究了其气敏性能。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等方法对合成材料进行了结构表征。结果表明:合成的花状纳米硒化钨为六方晶相,在三乙胺、氨水、三甲胺、苯胺、甲酰胺等胺类气体的检测中,对三乙胺气体具有高选择性和超快的响应恢复速率。在最佳工作温度220℃下,传感器对体积分数为50×10^(-6)的三乙胺的响应灵敏度达到20.1,其响应、恢复时间分别为6 s和3 s,最低检出限为0.3×10^(-6)。对硒化钨材料的气敏机理也进行了讨论,该材料在气敏领域有着潜在的应用前景。Using N,N-dimethylformamide as dispersant as well as sodium selenite and sodium tungstate as raw materials,the flower-like WSe_(2) nanomaterial stacked by ultrathin two-dimensional layered nanosheets were prepared by solvothermal method and its gas sensing properties were also studied.The structure of as-synthesized material was characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results indicated that the synthesized flower-like WSe_(2) was hexagonal phase and had the high selectivity and ultrafast response/recovery rate to triethylamine among the gas sensing properties to amine gases including triethylamine,ammonia,trimethylamine,aniline and formamide.Under the optimum operating temperature of 220℃,the sensitivity of the sensor to triethylamine with volume fraction of 50×10^(-6) reaches 20.1,the response time and recovery time are 6 s and 3 s respectively,and the minimum detection limit is 0.3×10^(-6).The gas sensing mechanism for the WSe_(2) nanomaterial was also discussed.The obtained WSe_(2) had potential applications in the gas sensing field.

关 键 词：硒化钨 花状结构 溶剂热法 气敏性能 

分 类 号：TQ125.2[化学工程—无机化工]