MOF-derived indium oxide hollow microtubes/MoS2 nanoparticles for NO2 gas sensing

In this paper, we fabricated a metal-organic frameworks-derived indium oxide hollow microtubes/molybdenum disulfide nanoparticles (In2O3/MoS2) nanocomposite film sensor using a layer-by-layer self-assembly method. Various characterization methods such as TG, XRD, SEM, TEM, BET and XPS were applied to inspect and verify its preparation and nanostructures. The NO2-sensing characteristics of the sensors based on In2O3/MoS2 composite were systematically examined. The results showed that the response of the In2O3/MoS2 film sensor has significantly improved compared with the In2O3 sensor. More importantly, the In2O3/MoS2 sensor exhibited excellent NO2 sensing performance with a good linearity, excellent reversibility and outstanding selectivity. Finally, based on the above experimental results, we discovered that the possible sensing mechanism was ascribed to the unique structure and the synergistic effects of In2O3 hollow microtubes and MoS2 nanoparticles.