溶剂热法制备硒化钨纳米花及其气敏性能研究

doi:10.11962/1006-4990.2020-0337

摘要/Abstract

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。

关键词: 硒化钨, 花状结构, 溶剂热法, 气敏性能

Abstract:

Using N,N-dimethylformamide as dispersant as well as sodium selenite and sodium tungstate as raw materials,the flower-like WSe₂ nanomaterial stacked by ultrathin two-dimensional layered nanosheets were prepared by solvothermal met-hod and its gas sensing properties were also studied.The structure of as-synthesized material was characterized by X-ray po-wder diffraction（XRD）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The results indi-cated that the synthesized flower-like WSe₂ 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,ani-line and formamide.Under the optimum operating temperature of 220 ℃,the sensitivity of the sensor to triethylamine with vol-ume fraction of 50×10 ^-6 reaches 20.1,the response time and recovery time are 6 s and 3 s respectively,and the minimum de-tection limit is 0.3×10^-6.The gas sensing mechanism for the WSe₂ nanomaterial was also discussed.The obtained WSe₂ had po-tential applications in the gas sensing field.

Key words: WSe₂, flower-like structure, solvothermal method, gas sensing

中图分类号:

TQ125.2

桂阳海,王幸辉,田宽,钱琳琳. 溶剂热法制备硒化钨纳米花及其气敏性能研究[J]. 无机盐工业, 2021, 53(5): 47-50.

Gui Yanghai,Wang Xinghui,Tian Kuan,Qian Linlin. Study on preparation of flower-like WSe₂ nanomaterial by solvothermal method and its gas sensing properties[J]. Inorganic Chemicals Industry, 2021, 53(5): 47-50.

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