【摘要】 NO₂是空气开关柜绝缘缺陷最重要的特征气体之一，对其进行准确监测可有效评估空气开关柜的运行状态。针对传统WS₂基气体传感器检测NO₂气敏响应低、响应恢复速度慢、功耗高等问题，提出一种用金属（Ni和Pd）掺杂WS₂基气体传感器检测空气开关柜绝缘缺陷气体NO₂的方法。利用水热法制备了WS₂、Ni-WS₂和Pd-WS₂三种气敏材料，制作了WS₂、Ni-WS₂和Pd-WS₂气体传感器并测试了其对NO₂的气敏特性，基于密度泛函理论探究了Ni-WS₂和Pd-WS₂单层的敏感机理。结果表明，两种金属掺杂分别在灵敏度和响应速度方面提升了本征WS₂传感器的气敏性能，其中Ni-WS₂传感器的气敏性能更好，对5×10^-6 NO₂灵敏度约为本征传感器的3.08倍。通过对Ni-WS₂和Pd-WS₂单层的敏感机理探究，验证了金属掺杂WS₂对NO₂气体吸附性能提升的实验结果。更多还原

【Abstract】 NO₂ is one of the most important characteristic gases of insulation defects in air switchgear. Accurate monitoring of NO₂ can effectively evaluate the operating state of air switchgear. Targeting at the problems of low response, slow response and high power consumption of NO₂ detected by traditional WS₂-based gas sensor, a method of detecting NO₂ insulation defect gas in air switchgear by doping WS₂-based gas sensor with metal（Ni and Pd）is proposed. Three kinds of gas sensitive materials, WS₂,Ni-WS₂ and Pd-WS₂,are prepared by using hydrothermal method. WS₂,Ni-WS₂ and Pd-WS₂ gas sensors are fabricated and their gas sensitive characteristics to NO₂ are tested. The sensitivity mechanism of Ni-WS₂ and Pd-WS₂ monolayer is explored based on density functional theory. The results show that the two metal-doped WS₂-based sensors improve the gas sensitive performance of the intrinsic WS₂ in terms of sensitivity and response speed, respectively, and the Ni-WS₂ sensor has better gas sensitive performance, and the sensitivity to 5×10^-6 NO₂ is about 3.08 times that of the intrinsic sensor. By exploring the sensitive mechanism of Ni-WS₂ and Pd-WS₂ monolayer, the experimental results of metal doped WS₂ on NO₂ gas adsorption performance are verified.更多还原