Construction of MoO3/MoSe2 nanocomposite-based gas sensor for low detection limit trimethylamine sensing at room temperature

In this paper, MoO3/MoSe2 nanocomposite was constructed by an improved hydrothermal and spin coating method for fabricating trimethylamine (TMA) gas sensor. The surface morphology and microstructure of the prepared materials were analyzed by XRD, XPS, SEM and TEM characterization methods. The microstructural characterization results demonstrated that the MoO3/MoSe2 nanocomposite had been successfully synthesized, in which the MoSe2 had a flower-shaped structure, and MoO3 had a rod-shaped structure. At the same time, the MoSe2 surface exhibited periodic honeycomb structure. The gas sensitivity experimental results showed that the proposed MoO3/MoSe2 sensor had excellent TMA sensing performance at room temperature, including high response capability, low detection limit (20 ppb), short response/recovery time (12 s/19 s), long-term stability, good repeatability and outstanding selectivity. The heterostructure of MoO3/MoSe2 had made outstanding contributions to the enhanced TMA gas sensing performance at room temperature.

Automated summary

In this study, a MoO3/MoSe2 nanocomposite was successfully synthesized and demonstrated excellent gas sensing performance for TMA. The MoSe2 exhibited a flower-shaped structure, MoO3 had a rod-like structure, and the MoSe2 surface showed a honeycomb structure, with the heterostructure of MoO3/MoSe2 contributing significantly to the enhanced sensing performance.