TiO2 and Ag2O Decorated GeTe Monolayer as a Highly Sensitive Material for SF6 Decomposition Species Detection

The effective detection and maintenance of electrical equipment failures in circuit maintenance is crucial in reducing public property losses. Therefore, the research and development of a highly sensitive SF6 decomposition detection device is of great significance. Here, in this article, the adsorption behavior and sensing characteristics of TiO2, Ag2O doped GeTe monolayer for SF6 decomposition species (H2S, SO2) have been studied through firstprinciples analysis. The results show that the doping of Ag2O and TiO2 enhances the conductivity of GeTe monolayer by 14.9% and 16.8%, respectively, and increases the adsorption energy of the doped GeTe monolayer for H2S and SO2 by 214% (TiO2-GeTe-H2S), 184% (TiO2-GeTe-SO2), 361% (Ag2O-GeTe-H2S), and 191% (Ag2O-GeTe-SO2), respectively. The adsorption energy with proper size makes both doped GeTe monolayers highly sensitive and selective with a rapid recovery time, which theoretically solves the problem of industrial recycling of sensing materials. The research results provide a theoretical basis for the material selection of a highly selective sensor for detecting SF6 decomposition products.