WSe_(2)/ZnS复合材料制备及其气敏性能

Preparation and gas sensing property of WSe_(2)/ZnS nanocomposite

采用两步法和溶剂热反应,先制备硒化钨纳米花,再以硒化钨为模板,在其表面生长硫化锌纳米棒制备WSe_(2)/ZnS复合材料,并研究复合材料的气敏性能。通过X射线粉末衍射(XRD)和扫描电子显微镜(SEM)对合成材料进行了表征。结果显示,合成的WSe_(2)/ZnS复合材料在三乙胺、氨水、硫化氢、氮氧化物、三甲胺、苯胺、甲酰胺、甲醛和乙醇等气体的检测中,对三乙胺气体表现出良好的选择性和较高的灵敏度。在最佳工作温度240℃下,WSe_(2)/ZnS-7传感器对10×10^(-6)三乙胺的响应灵敏度达到10.72,其响应、恢复时间分别为7s和11s,最低检出限为0.1×10^(-6)。最后,对WSe_(2)/ZnS复合材料的气敏机理进行了讨论。该材料在气敏领域有着潜在的应用前景。

The WSe_(2)/ZnS composites were prepared by two-step solvothermal reaction.First, WSe_(2)nanoflowers were formed in a teflon-lined stainless steel autoclave.Then, the WSe_(2)/ZnS composites were prepared by growing ZnS nanorods on the surface of WSe_(2)as template.The gas sensitive properties of the composites were studied.The as-synthesized materials were also characterized by X-ray powder diffraction(XRD) and scanning electron microscopy(SEM).The results demonstrated that the synthesized WSe_(2)/ZnS composites material had high selectivity and sensitivity for the detection of triethylamine, ammonia, hydrogen sulfide, nitrogen oxide, trimethylamine, aniline, formamide, formaldehyde, and ethanol.At the optimal working temperature of 240℃,the response of WSe_(2)/ZnS-7 sensor to 10 ppm triethylamine reached 10.72,and its response and recovery times were7 s and 11 s, respectively.The detection limit can be low to 0.1 ppm.In addition, the gas sensing mechanism for the WSe_(2)/ZnS nanocomposites was also discussed.The obtained WSe_(2)/ZnS had potential applications in the gas sensing field.