Journal
RSC ADVANCES
Volume 7, Issue 61, Pages 38714-38724Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra05685k
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Funding
- Ministry of Science, ICT & Future Planning [2014R1A4A1008140]
- National Research Foundation of Korea (NRF) - Ministry of Education [2016R1D1A1B01007189]
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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 (similar to 85%) and formaldehyde (similar to 88%) at 25 ppm concentration and optimum working temperatures of 175 degrees C and 225 degrees 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 (O-2(-) & 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 degrees C and 225 degrees 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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