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In this study, we reported a successful synthesis of a nanocomposite based on SnO2 nanoneedles anchored to NiO microsphere by a simple two-step hydrothermal route. The results show that the SnO2/NiO nanocomposite-based sensor exhibits more prominent performances than the pristine NiO microsphere to NO2 such as larger responses and more outstanding repeatability. The improved properties are mainly attributed to the p–n heterojunctions formed at the SnO2–NiO interface, leading to the change of potential barrier height and the enlargement of the depletion layer. Besides, the novel and unique nanostructure provides large and effective areas for the surface reaction. In addition, a plausible growth mechanism and the enhanced sensing mechanism were proposed to further discuss the special nanostructure which will benefit the exploration of high-performance sensors. [ABSTRACT FROM AUTHOR]

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]