Enhanced trimethylamine sensing properties of ternary rGO/MoO3/Au hybrid nanomaterials

Recently, rGO has been widely used in gas-sensitive research because of its high conductivity and large specific surface area. In this paper, rGO/MoO3 nanocomposites were first synthesized via a hydrothermal method, and then the ternary rGO/MoO3/Au hybrid nanomaterials were synthesized by adding Au nanoparticles. Its structure and morphology were fully characterized by SEM, TEM, EDS, XRD, TG and other methods and the results show that the three components are well combined. Then rGO/MoO3/Au gas sensors were prepared and their performance was tested. 160 °C is the optimal operating temperature, and the response to 10 ppm TMA can reach 68.5 at this temperature, which is much higher than pure MoO3 and rGO/MoO3. At the same time, it has good selectivity and repeatability. The reason is that the p–n heterojunction generated at the interface between rGO and MoO3 and the catalytic activity of precious metal Au nanoparticles can improve the gas-sensitive properties of the material.