摘要
以六氯化钨为钨源、无水乙醇为溶剂,在较低的溶剂热合成温度(100℃)下,制备出具有分级结构的WO3。通过扫描电子显微镜(SEM)和X射线衍射(XRD)研究了产物的形貌及物相组成,发现WO3呈二维扇形纳米片自组装而成的花球状结构。进一步采用直流电阻测量技术分析了WO3对H2S的气敏性能。测试结果表明,分级结构WO3的最佳工作温度为140℃。在此温度下,其可检测H2S最低体积分数为1×10^-7,在H2S体积分数5×10^-7~4×10^-5内线性关系良好,响应和恢复时间分别为12和130 s,且短期稳定性良好,对H2S表现出良好的选择性。最后研究了基于分级结构的WO3传感器对H2S可能存在的响应机理。
WO3 with hierarchical structure was prepared at a lower solvent thermal synthesis temperature(100℃)using tungsten hexachloride as the tungsten source and absolute ethanol as the solvent.The morphology and phase composition of the product were studied by the scanning electron microscopy(SEM)and X-ray diffraction(XRD).It is found that the WO3 has a flower spherical structure self-assembled from two-dimensional fan-shaped nanosheets.Furthermore,the gas sensitivity of the WO3 to H2S was analyzed by the direct current resistance measurement technology.The test results show that the optimum working temperature of the hierarchical structure WO3 is 140℃.At this temperature,the minimum detectable volume fraction of H2S is 1×10^-7,the linear relationship is good in the H2S volume fraction range of 5×10^-7-4×10^-5,the response time and recovery time are 12 and 130 s respectively,and the short-term stability is good.Meanwhile,it shows a good selectivity to H2S.Finally,the possible response mechanism of the WO3 sensor based on the hierarchical structure to H2S was also studied.
作者
孙墨杰
张行
闫静茹
张振业
高欣蓓
宋晓晨
Sun Mojie;Zhang Hang;Yan Jingru;Zhang Zhenye;Gao Xinbei;Song Xiaochen(School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,China;School of Mechanical Engineering,Northeast Electric Power University,Jilin 132012,China)
出处
《微纳电子技术》
北大核心
2020年第12期1017-1022,共6页
Micronanoelectronic Technology
基金
吉林省科技发展计划重点科技攻关项目(20170204015SF)。
关键词
SF6分解产物
H2S检测
WO3
分级结构
低温溶剂热反应
SF6 decomposition product
H2S detection
WO3
hierarchical structure
low temperature solvothermal reaction
