Abstract
Fe2O3 and In2O3 nanoparticles were prepared by a citric sol-gel method and mixed subsequently to form the (x)Fe2O3/(1 − x)In2O3 (x = 0, 0.05, 0.10, 0.15, 0.20, 0.50, 1) nanocomposites. XRD confirmed the separate phases of cubic In2O3 and orthorhombic Fe2O3 in the composites. At the prime working temperature of 200 °C, the 0.15Fe2O3/0.85In2O3 nanocomposite-based sensor showed the best acetone sensing performance among all sensors, including the highest gas response, sensitivity, selectivity and stability. Although the mean grain size was slightly increased upon adding Fe2O3 nanoparticles in larger sizes, which leaded to smaller BET surface area, the electron transfer from Fe2O3 to In2O3 across the heterostructure interface increased the electron concentration in the surface region of In2O3, which resulted in more adsorbed oxygen species on the surface of In2O3 and favored the subsequent acetone sensing process.
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