Room temperature detection of nitrogen dioxide gas sensor based on Pt-modified MoSe2 nanoflowers: Experimental and theoretical analysis

The intrinsic and Pt-doped MoSe2 gas sensing materials with hierarchical flower structure were prepared by hydrothermal routes, and its crystal morphology and chemical element composition were studied by microscopic characterization. The response properties of the MoSe2-based sensors to NO2 were tested by the gas sensing test platform. The test results confirmed that the Pt-doped sample exhibited excellent detection properties for 20 ppm NO2, with a response of 7.29 (3.14 times of the intrinsic MoSe2) at room temperature. The introduction of Pt caused the beneficial specific surface area of MoSe2, and offered more reaction sites for gas-sensitive reactions. In addition, the promotion impact of doped Pt on the adsorption capability of MoSe2 to NO2 was confirmed from the aspects of electronic properties and adsorption behavior based on the density functional theory (DFT). The combination of experimental consequence and theoretical analysis indicates the promising application prospects of the Pt-doped MoSe2 nanoflower for low-concentration NO2 detection at room temperature.