Abstract
In2O3@TiO2 core-shell nanocubes were successfully prepared via hydrothermal method and subsequent water bath method. The characterization results show that the size of the In2O3@TiO2 nanocomposites is 250–350 nm. The In2O3@TiO2 nanocomposites based sensor presents excellent sensing response to formaldehyde at ppb level. The response of In2O3@TiO2 nanocomposites based sensor to 1 ppm formaldehyde is about 5.3 at room temperature under UV activation, which is three times higher than that of the pure In2O3 based sensor. The response/recovery time of In2O3@TiO2 nanocomposites based sensor are 24 s and 52 s, respectively. The involved chemical reactions activated by UV had been investigated by in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS). This work proves that core-shell nanocubes combined with UV activation could significantly enhance the sensing properties of the sensors.
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