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Low temperature and highly sensitive ethanol sensor based on Au modified In2O3 nanofibers by coaxial electrospinning

Abstract

Gas sensor is a powerful tool for detecting the leakage of some hazardous gas and monitoring human health. However, most of the sensors based on metal oxide semiconductors can only function at elevated operating temperatures, which leads to high power consumption and poor durability. Here Au nanoparticles decorated In2O3 nanofibers (IO-Au NFs) have been successfully synthesized by one-step coaxial electrospinning for efficient sensing of ethanol gas at low temperature. The temperature and gas concentration effects on the sensing properties of IO-Au NFs elucidate that Au decoration can remarkably improve the response, reduce the detection limit down to 1 ppm, and lower the sensors’ optimal operating temperature down to 175 °C. The IO-Au-0.42 sensor with the optimized Au concentration presents a superior response of 116.13 to 100 ppm ethanol at 175 °C, which is six times larger than that of the pristine In2O3 sensor. Moreover, the IO-Au-0.42 sensor exhibits a greatly shorter response/recovery time of 2 s/152 s to 100 ppm ethanol gas at 175 °C than the pristine In2O3. Surprisingly, even at room temperature, the IO-Au-0.42 sensor still presents a high response of 11.12 to 100 ppm ethanol which is 5.4 times larger than the pristine In2O3 sensor, and shows a short response/recovery time of 47 s/351 s. These enhanced sensing performance at low temperature can be mainly ascribed to the synergistic action of catalytic effect, spillover effect, electronic sensitization effect, and deficient oxygen concentration.

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Publication details

The article was received on 24 Jul 2018, accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03669A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Low temperature and highly sensitive ethanol sensor based on Au modified In2O3 nanofibers by coaxial electrospinning

    B. Huang, Y. Wang, Q. Hu, X. Mu, Y. Zhang, J. Bai, Q. Wang, Y. Sheng, Z. Zhang and E. Xie, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03669A

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