Gas-Sensing Properties of Dissolved Gases in Insulating Material Adsorbed on SnO2–GeSe Monolayer

Abstract

In a transformer, the insulation materials will produce different dissolved gases due to various faults in the operation of the transformer, in which C2H2, CH4, and H2 are the main dissolved gases. In this study, the adsorption characteristics of the above three gases on the SnO2–GeSe monolayer surface were discussed and analyzed based on the density functional theory. The adsorption energy, transfer charge, geometric structure parameters, electronic density of states, electronic local function, charge difference density, and recovery time were calculated and compared to characterize the gas-sensing adsorption mechanism. The results showed that the SnO2–GeSe monolayer exhibited good adsorption capacity, selectivity, and repeatability for the three characteristic dissolved gases. After adsorbing CH4 gas molecules, the conductivity of the SnO2–GeSe monolayer decreased. After adsorbing C2H2 and H2 gas molecules, the conductivity of the SnO2–GeSe monolayer increased. Therefore, the SnO2–GeSe monolayer has great application potential in the real-time monitoring of dissolved gases in insulating materials, which may become a new type of resistive gas sensor.

Adsorption and Gas-Sensing Properties of Agn (n = 1–4) Cluster Doped GeSe for CH4 and CO Gases in Oil-Immersed Transformer

“…As a result, it is one of the most widely used materials in high temperature and high pressure environments [ 25 ]. Gui et al studied the adsorption behavior of CO, CH 4 , C 2 H 2 , C 2 H 4 on metal oxide (CuO, NiO, Ag 2 O)-doped GeSe surfaces; Guo et al investigated the adsorption characteristics of C 2 H 2 , CH4 4 , H 2 on SnO 2 -GeSe (SnO 2 doped onto GeSe surfaces) [ 26 , 27 ]. However, the ability of intrinsic GeSe to adsorb gases is limited, such as CH 4 , C 2 H 2 , H 2 , etc., [ 12 , 28 ].…”

Machine learning and DFT investigation of CO, CO2and CH4adsorption on pristine and defective two-dimensional magnesene

“…This low recovery time of CH 4 is associated with the lowest adsorption energy of all the studied configurations. From the recovery time analysis, it is clear that 2D-Mg is suitable for the detection of CH 4 compared to CO and CO 2 , and the computed room temperature recovery time of the CH 4 molecule is much lower than that observed for many reported nanomaterials such as the SnO2-GeSe monolayer (3.73 × 10 −10 s) 74 and olympicene (3.73 × 10 −10 s). 75…”

“…This low recovery time of CH 4 is associated with the lowest adsorption energy of all the studied configurations. From the recovery time analysis, it is clear that 2D-Mg is suitable for the detection of CH 4 compared to CO and CO 2 , and the computed room temperature recovery time of the CH 4 molecule is much lower than that observed for many reported nanomaterials such as the SnO2-GeSe monolayer (3.73 Â 10 À10 s) 74 and olympicene (3.73 Â 10 À10 s). 75 From the above analysis, it is evident that the charge transfer between the host surface and guest molecules is mainly associated with the adsorption energy, the difference in electronegativity, and bonding features.…”

As-Doped h-BN Monolayer: A High Sensitivity and Short Recovery Time SF6 Decomposition Gas Sensor

“…Therefore, it is necessary to further develop gas sensors that can cover SO 2 F 2 and other major SF 6 decomposition gases. With the development of computer science, the DFT method based on quantum mechanics has been widely used in the field of gas sensing [21][22][23][24][25][26][27][28][29][30][31][32]. According to previous research, the material properties calculated by the DFT method have high consistency with the experimental results, which confirms the feasibility of this method in the field of gas sensing.…”