Carbon monoxide gas sensing properties of metal-organic frameworks-derived tin dioxide nanoparticles/molybdenum diselenide nanoflowers

A novel metal-organic frameworks-derived tin dioxide nanoparticles/molybdenum diselenide nanoflowers (SnO2/MoSe2) nanocomposite was designed by a facile hydrothermal method. Various characterization techniques demonstrated the successful preparation of the SnO2/MoSe2 nanostructures. The SnO2/MoSe2 composite with SnO2 and MoSe2 mass ratio of 4:1 exhibited a high response towards CO gas sensing at room temperature. The systematical gas sensing tests showed that the SnO2/MoSe2 composite at room temperature exhibited fast gas response/recovery speed, excellent repeatability, and anti-humidity interference for CO detection. It also showed an outstanding selectivity to CO against various potential interfering gases such as SO2, H2S, CH4, H-2 and CO2. Further studies indicated that the SnO2/MoSe2 nanocomposite improved CO gas performance due to the nn heterojunction formed at the interface between SnO2 nanoparticles and MoSe2 nanoflowers.