Find in Library

SF₆ is a common insulating medium of gas-insulated switchgear (GIS). However, it is inevitable that SF₆ will be decomposed due to partial discharge (PD) in GIS, which will cause hidden dangers to the safe and stable operation of equipment. Based on the DFT method, the two-dimensional nano-composite As-doped h-BN (As-BN) monolayer was proposed. By modeling and calculating, the ability of an As-BN monolayer as a specific sensor for SO₂F₂ (compared with an H₂O adsorption system and CO₂ adsorption system) was evaluated by parameters such as the binding energy (<i>E</i>_b), adsorption energy (<i>E</i>_ads), transfer charge (Δ<i>Q</i>), geometric structure parameters, the total density of states (TDOS), band structure, charge difference density (CDD), electron localization function (ELF), sensitivity (<i>S</i>), and recovery time (<i>τ</i>). The results showed that an As-BN monolayer showed strong adsorption specificity, high sensitivity, and short recovery time for SO₂F₂ gas molecules. Therefore, the As-BN monolayer sensor has great application potential in the detection of SF₆ decomposition gases.