二硫化钼传感器对于绝缘介质特征分解气体的敏感特性研究

Under the influence of discharge and overheating faults, the electrical insulating medium(SF₆, insulating oil, etc.)can decompose a series of characteristic gases. The operation condition of electrical equipment can be assessed through compositional analysis of gas. In this paper, the layered molybdenum disulfide(MoS₂)based on hydrothermal process is synthesized and filled in the gas sensor. The sensitive features of such six kinds of insulation medium decomposed gases as sulfuretted hydrogen(H₂S), sulfur dioxide(SO₂), carbon oxide(CO), methane (CH₄), ethyne(C₂H₂)and hydrogen(H₂)is analyzed. Compared to three commercial sensors with serious cross-sensitivity, MoS₂ sensor shows specific selectivity toward H₂S. For insulating oil decomposition gases(CO, C₂H₂, H₂, CH₄), MoS₂ sensor is only sensitive to CO. Furthermore, MoS₂ sensor also has outstanding performance in detecting the repletion of H₂S and CO. During the five cycles of testing the fluctuation range of response value does not exceed 7.2% and5.95% respectively. The result of concentration test also indicates that, incase of H₂Sand CO below 50μL/L, the linearity of MoS₂ sensor is good (9.26% and 0.62%). In addition, MoS₂ sensor shows a synergistic adsorption to- wards H₂S and CO. With the increase of H₂S concentration (10, 30, 50 μL/L), the influence of CO concentricity on the response values is less (6.74%, 4.94%, 3.47%). Thus, the layered MoS₂ has a broad application prospect in the detection of insulating medium characteristic decomposition gas.