| Summary: | Dissolved gas analysis (DGA) is recognized as one of the most reliable methods in transformer fault diagnosis technology. In this paper, three characteristic gases of transformer oil (CO, C<sub>2</sub>H<sub>4</sub>, and CH<sub>4</sub>) were used in conjunction with a Cr-decorated InN monolayer according to first principle calculations. The adsorption performance of Cr–InN for these three gases were studied from several perspectives such as adsorption structures, adsorption energy, electron density, density of state, and band gap structure. The results revealed that the Cr–InN monolayer had good adsorption performance with CO and C<sub>2</sub>H<sub>4</sub>, while the band gap of the monolayer slightly changed after the adsorption of CO and C<sub>2</sub>H<sub>4</sub>. Additionally, the adsorption property of the Cr–InN monolayer on CH<sub>4</sub> was acceptable and a significant response was simultaneously generated. This paper provides the first insights regarding the possibility of Cr-doped InN monolayers for the detection of gases dissolved in oil.
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