Preparation and Gas-Sensing Properties of MoS₂/Cd₂SnO₄ Composite Materials

Cd2SnO4 was prepared by hydrothermal-calcination method and a series of MoS2/Cd2SnO4 composite materials were prepared by ultrasonic mixing method. To analyze the structures and morphologies of the Cd2SnO4 and MoS2/Cd2SnO4 composite materials, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy were used. The effect of the doped amount of MoS2 on the gas sensing properties of MoS2/Cd2SnO4 composite materials was investigated. The results showed that when the mass ratio of MoS2 to Cd2SnO4 was 2.5%, the response of the gas sensor of MoS2/Cd2SnO4 composite material to 100 mu L.L-1 formaldehyde vapor at 170 degrees C was 40.0 and the detection limit reached 0.1 mu L.L-1.