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A TMO-ZnO Heterojunction-Based Sensor for Transformer Defect Detection: A DFT Study
Jingyi Yan1, Weiju Dai1, Dexu Zou1
1Electric Power Research Institute of Yunnan Power Grid, Kunming 650214, China.
None:
The gas adsorption and sensing properties of a transition metal oxide (TMO)-ZnO heterojunction-based sensor for H2, CO, and C2H4 are analyzed. It is found that CuO, Ag2O, and Cu2O stably composite onto the surface of ZnO by forming heterojunctions, which helps to improve the gas sensing and selectivity of the sensor. The adsorption results show that CuO-ZnO shows physical adsorption for H2 and good gas sensing performance for CO and C2H4, while Ag2O-ZnO and Cu2O-ZnO have significant responses for H2, CO, and C2H4. In addition, the introduction of the TMO-ZnO heterojunction structure can effectively avoid the sensor poisoning phenomenon, as the gas adsorption process does not destroy the original geometric configuration of the heterojunction. This study lays a theoretical foundation for preparing TMO-ZnO heterojunction-based sensors for transformer defect detection and energy efficiency analysis.
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