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, Ag $_{{2}}\text{O}$ doped GeTe monolayer for SF6 decomposition species ( $\text{H}_{{2}}\text{S}$ , SO2) have been studied through first-principles analysis. The results show that the doping of Ag $_{{2}}\text{O}$ 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 $\text{H}_{{2}}\text{S}$ and SO2 by 214% (TiO2–GeTe– $\text{H}_{{2}}\text{S}$ ), 184% (TiO2–GeTe–SO2), 361% (Ag $_{{2}}\text{O}$ –GeTe– $\text{H}_{{2}}\text{S}$ ), and 191% (Ag $_{{2}}\text{O}$ –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.