WSe2 modified monocrystalline SnSe2 nanosheets for hydrogen gas detection and its sensing mechanism

This paper presents a hydrogen sensor made of WSe 2 modified monocrystalline SnSe 2 nanolayer . The hydrogen sensitive property of tungsten diselenide (WSe 2 ) and tin diselenide (SnSe 2 ) was found by hydrothermal adjustment of the molar ratio . The samples were characterized for their crystal structure, microstructure, morphology, and elemental composition , and the morphology and heterojunction formation of the nanocomposites were confirmed. When the optimal molar ratio is 1:1 and the optimal working temperature is 270 °C, the WSe 2 /SnSe 2 sensor have good sensing properties for hydrogen, and the sensitivity for 100 ppm hydrogen is about 7.27. Finally, the experiment proves that WSe 2 /SnSe 2 gas sensor has a unique selection of hydrogen and has a wide application prospect in hydrogen detection in the future. The gas sensing mechanism of the hydrogen sensor is discussed based on its material structure .