Fast-response xylene gas sensor based on Pt-modified Fe2(MoO4)3 nano-hollow spheres compounded on rGO

Xylene is not only a carcinogenic gas, but also one of indoor pollution gases. Therefore, it is indispensable to develop a xylene gas sensor with fast response and high sensitivity. In this paper, 5   wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt gas sensitive material was prepared by integrating the excellent properties of reduced graphene oxide (rGO) and noble metal Pt. In addition, the microstructure, elemental composition, phase and crystal structure of 5   wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt nanocomposites were characterized. The nanostructure of Pt-modified Fe 2 (MoO 4 ) 3 nano-hollow spheres compounded on rGO was successfully prepared. The gas sensitive experiment results showed that 5   wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt had better gas sensitive performance than Fe 2 (MoO 4 ) 3 (FMO), FMO-1 wt%Pt and 5   wt%rGO-FMO. At the optimum working temperature (175℃), the 5   wt%rGO-FMO-1 wt%Pt sensor had a maximum response value to xylene, and could detect 500 ppb xylene. In addition, the 5   wt%rGO-FMO-1 wt%Pt nanocomposite showed a rapid response and recovery process to xylene. Moreover, the gas sensitivity mechanism and enhancement of gas sensitivity of 5   wt%rGO-FMO-1 wt%Pt to xylene were systematically analyzed. The 5   wt%rGO-FMO-1 wt%Pt gas sensor prepared provided a new reference for the detection of xylene.