Fault signature gas sensing by the Ni-dispersed SnS2 monolayer for operation status evaluation of dry-type transformer: a first-principles study

Abstract

Sensing fault signature gases of the dry-type transformers is a workable technique to evaluate its operation condition. In this work, we use the first-principles theory for the Ni-doped SnS2 (Ni-SnS2) monolayer for sensing HCHO and C2H3Cl, two fault signature gases, for the purpose mentioned above. One S atom on the SnS2 surface is replaced by the Ni atom to establish the Ni-SnS2 monolayer with the formation energy of 0.58 eV. The adsorption parameters indicate the chemisorption of Ni-SnS2 monolayer and its electron-accepting property in the interaction with two gas species. The electronic property, work function and dielectric function of the gas adsorbed systems reveal the potential of the Ni-SnS2 monolayer to be a resistive, field-effect transistor and an optical gas sensor for the detection of HCHO and C2H3Cl. These findings shed light on the Ni-SnS2 monolayer as a novel and promising sensing material for fault signature gas sensing in the dry-type transformers, which paves the way to explore other novel SnS2-based gas sensors for operation status evaluation in the power system.