Gas-Sensing Properties of Dissolved Gases in Insulating Material Adsorbed on SnO2-GeSe Monolayer
Gas-Sensing Properties of Dissolved Gases in Insulating Material Adsorbed on SnO2-GeSe Monolayer
复制标题
SnO2·GeSe单层吸附绝缘材料中溶解气体的气敏特性
DOI：
10.3390/chemosensors10060212
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发表时间：
2022-06-01
期刊：
影响因子：
4.2
通讯作者：
Huang, Zhengyong
中科院分区：
文献类型：
--
作者：
Guo, Liang-Yan;Liang, Suning;Huang, Zhengyong
在Transformer中，由于Transformer运行中的各种故障，绝缘材料会产生不同的溶解气体，其中C2 H2、CH 4和H-2是主要的溶解气体。本文基于密度泛函理论，对上述三种气体在SnO 2-GeSe单分子膜表面的吸附特性进行了讨论和分析。计算了吸附能、转移电荷、几何结构参数、电子态密度、电子局域函数、电荷差密度和恢复时间，并进行了比较，表征了气敏吸附机理。结果表明，SnO 2-GeSe单分子膜对3种特征溶解气体具有良好的吸附能力、选择性和重复性。吸附CH 4气体分子后，SnO 2-GeSe单分子膜的电导率下降。吸附C_2H_2和H_2 ~-气体分子后，SnO_2-GeSe单分子膜的电导率增加。因此，SnO 2-GeSe单分子膜在绝缘材料中溶解气体的实时监测方面具有很大的应用潜力，有望成为一种新型的电阻式气体传感器。
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 H-2 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 H-2 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.