MoS2/石墨烯复合材料对NOx气敏特性影响分析

Gas-sensitive Property of NOx Influenced by MoS2/Graphene Composite Material

为了快速准确检测汽车尾气中的NOx气体浓度,采用低温水热法制备了MoS2/石墨烯复合纳米材料。利用掩膜法将制备的MoS2/石墨烯镀膜于氧化铝基体表面形成敏感薄膜,制作了一种薄膜型NOx传感器。采用扫描电子显微镜(SEM)、高分辨透射电子显微镜(HR-TEM)和X-射线光电子能谱(XPS)仪,表征了MoS2/石墨烯的相组成、微观形貌和电化学特性,分析了MoS2/石墨烯复合材料对NOx的气敏机理。在气体传感器静态测试系统上,测试了NOx传感器灵敏度、温度、响应-恢复、抗干扰和长期稳定等特性。结果表明,MoS2/石墨烯传感器灵敏度是MoS2传感器2.1倍,响应时间为3.6 s,恢复时间为9.9 s,具有良好的重复性、选择性和长期稳定性。表明该传感器可实现汽车尾气中NOx准确检测。

In order to detect NOx concentration in automobile exhaust quickly and accurately,MoS2/graphene composite material were prepared by low temperature hydrothermal method.A thin-film NOx sensor was fabricated by coating MoS2/graphene composite material onto the surface of alumina substrate by mask method.The phase composition,microstructure and electrochemical properties of MoS2/graphene composite material were displayed using scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HR-TEM)and X-ray photoelectron spectroscopy(XPS).The gas-sensitive mechanism of MoS2/graphene composites to NOx was analyzed.The sensitivity,temperature,response-recovery,anti-interference and long-term stability of NOx sensor were tested in the gas sensor static test system.The results show that the sensitivity of MoS2/graphene sensor was 2.1 times that of MoS2 sensor,the response time was 3.6 s,and the recovery time was 9.9 s,showing good repeatability,selectivity and long-term stability.It shows that the sensor can accurately detect NOx in automobile exhaust.