Gas-Sensing Properties of Dissolved Gases in Insulating Material Adsorbed on SnO2–GeSe Monolayer

In a transformer, the insulation materials will produce different dissolved gases due to various faults in operation of which C2H2, CH4, and H2 are main gases. this study, adsorption characteristics above three on SnO2–GeSe monolayer surface were discussed analyzed based density functional theory. The energy, transfer charge, geometric structure parameters, electronic states, local function, charge difference density, recovery time calculated compared characterize gas-sensing mechanism. results showed that exhibited good capacity, selectivity, repeatability for characteristic After adsorbing CH4 gas molecules, conductivity decreased. C2H2 increased. Therefore, has great application potential real-time monitoring insulating materials, may become new type resistive sensor.