A Promising Gas Sensor Based on Monolayer α-SbN to Detect SO2 Among SF6 Decompositions

The adsorption of five decomposed components (SO2, SOF2, SO2 F-2, H2S, and HF) of SF6 on monolayer alpha-SbN was investigated using the density functional theory. Based on the adsorption configurations, we built a simulated gas sensing device using monolayer alpha-SbN, and the response to five gases was discussed and compared. The results showed that SO2 and HF adsorption exhibited relatively larger adsorption energy and electron transfer with states overlaps in the density of states. Only SO2 adsorption leads to the obvious decrease of band gap from about 1.47 to 1.15 eV. The current-voltage property demonstrates that the simulated gas sensor only had high response to SO2 among these five gases. Our work suggests that there is a promising prospect for detecting SO2 among SF6 decompositions using a monolayer alpha-SbN based gas sensor.