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. [ABSTRACT FROM AUTHOR]