Nanocube In2O3@RGO heterostructure based gas sensor for acetone and formaldehyde detection

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Abstract

Here, we studied the gas sensing response properties for acetone and formaldehyde by a chemiresistive nanocube In2O3@RGO heterostructure sensor. The nanocube In2O3@RGO heterostructure based sensor demonstrates a high response to acetone (∼85%) and formaldehyde (∼88%) at 25 ppm concentration and optimum working temperatures of 175 °C and 225 °C, respectively. Additionally, we examined the influence of potential barrier heights in the response/recovery time of the nanocube In2O3@RGO heterostructure based acetone and formaldehyde gas sensor. The real-time response/recovery analysis reveal that the sensor response depends on the potential barrier height as well as adsorbed active sites (O2- & O-) on the sensor surface. Furthermore, the nanocube In2O3@RGO heterostructure based gas sensor shows good selectivity to acetone and formaldehyde at optimum working temperature of 175 °C and 225 °C, respectively, compared to the other interfering gases such as ethanol, methanol, chloroform, toluene, benzene, ammonia, formic acid and acetic acid. The life-time analysis has been performed for 30 days, which showes the stability of nanocube In2O3@RGO heterostructure based acetone and formaldehyde sensor.

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Mishra, R. K., Murali, G., Kim, T. H., Kim, J. H., Lim, Y. J., Kim, B. S., … Lee, S. H. (2017). Nanocube In2O3@RGO heterostructure based gas sensor for acetone and formaldehyde detection. RSC Advances, 7(61), 38714–38724. https://doi.org/10.1039/c7ra05685k

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