Gas sensing performances and mechanism at atomic level of Au-MoS2 microspheres.

The detection of oil-dissolved gases (such as CO, CH 4 and H 2) in transformers on-line is an important technology to predict and judge the operating status of transformers. Microstructure and gas sensing performance of Au-MoS 2 microspheres synthesized by hydrothermal method were investigated in the present research. The results indicated Au-MoS 2 based gas sensor has excellent response to CO, CH 4 and H 2 gases with maximum responses of 25.48, 16.75 and 8.48 at 30 ppm in their optimum working temperature (150 °C, 150 °C, 175 °C). In addition, First-principle calculation was carried out to expound the sensing mechanism in detail. The conclusions of this study suggest that Au-MoS 2 monolayer exhibits a promising applicable future in sensor detecting of oil-dissolved gases in power transformer. The hierarchical flower-like Au-MoS 2 microspheres were favoring synthesized using simple hydrothermal method and their microstructure are measured. Gas sensing performance and atomic level gas sensing mechanism of MoS 2 microspheres to CO, CH 4 and H 2 was investigated. We found Au-MoS 2 microspheres gas sensor has good gas sensing performances and Au-MoS 2 monolayer exhibits excellent adsorption capacity to three target gases. Unlabelled Image • The hierarchical flower-like Au-MoS 2 microspheres were synthesized via simple hydrothermal method. • Au-MoS 2 microspheres gas sensor shows good gas sensing properties to CO, H 2 and CH 4. • The excellent adsorption performances of Au-MoS 2 monolayer to CO, H 2 and CH 4 were discussed in detail. • Theoretical studies have been applied to analyze the gas sensing mechanism of Au-MoS 2 microspheres to CO, H 2 and CH 4. [ABSTRACT FROM AUTHOR]