Microwave-assisted growth of In2O3 nanoparticles on WO3 nanoplates to improve H2S-sensing performance

摘要: Hierarchical In2O3@WO3 nanocomposites, consisting of discrete In2O3 nanoparticles (NPs) on single-crystal WO3 nanoplates, were synthesized via a novel microwave-assisted growth NPs the surfaces nanoplates that derived through an intercalation and topochemical-conversion route. The techniques XRD, SEM, TEM XPS used to characterize samples obtained. gas-sensing properties together with nanoparticles, comparatively investigated using inorganic gases organic vapors as target substances, emphasis H2S-sensing performance under low concentrations (0.5–10 ppm) at 100–250 °C. results show size range 12–20 nm are uniformly anchored nanoplates. amounts can be controlled by changing In3+ in their precursors. (In/W = 0.8) sample has highest operating 150 °C; its response 10 ppm H2S is high 143, 4 times higher than 13 nanocrystals. However, responses sensors less upon exposure 100 CO, SO2, H2, CH4 vapors, 100–150 improvement selectivity molecules attributed synergistic effect hierarchical microstructures multifunctional interfaces.