Geometric structure and SOF2 adsorption behavior of Ptn (n=1-4) clustered (8, 0) single-walled CNT using density functional theory

Adsorption of dissolved gas molecules in the transformer oil on silver-modified (002) planes of molybdenum diselenide monolayer: a DFT study

High-sensitivity gas sensor is a crucial online monitoring device to ensure the safe operation of the transformer. In this paper, based on density functional theory, an Ag-MoSe₂monolayer system was established by investigating four different positions of Ag doping to adsorb the dissolved gas (H₂, C₂H₂, CH₄, CO and CO₂) in transformer oil. The sensing properties of adsorption system for different dissolved gas were studied via the analysis of adsorption energy (E_ad), charge transfer, density of state, energy band, lowest unoccupied molecular orbit, highest occupied molecular orbit, and desorption time. Finally, Ag-MoSe₂had good adsorption and desorption properties for CO and CH₄at room temperature, and could be used as a sensor material for the two gases detection. It had strong adsorption and poor desorption performances for C₂H₂at room temperature, which could serve as C₂H₂scavenger, and simultaneously had good adsorption and desorption performance at a temperature of 358 K, therefore it could be used as a candidate material to detect C₂H₂at high temperatures. Ag-MoSe₂had a weak interaction with H₂and CO₂, thus was not suitable for detecting the two gases. The results indicated that Ag-MoSe₂had excellent potential in detecting dissolved gases in transformer oil.