Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (6): 1033-1040.doi: 10.1007/s40242-024-3244-0

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Highly Sensitive Ethanol Gas Sensor Based on Ag Nanoparticles Decorated In2O3

ZHANG Susu, ZHANG Meng, GUO Ying   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2023-11-01 Online:2024-12-01 Published:2024-10-26
  • Contact: GUO Ying,guoying@mail.buct.edu.cn E-mail:guoying@mail.buct.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 52072022, 21627813, 51472021).

Abstract: Ag nanoparticle decorated In2O3 composites for high sensitivity and high selectivity detection of ethanol were prepared by hydrothermal and annealing methods. The effects of Ag content on the sensing properties of Ag decorated In2O3 sensors were also investigated. It was found that all Ag decorated In2O3 sensors exhibited better sensing performance in terms of sensitivity and selectivity compared to pure In2O3 sensors. By optimizing the addition amount of Ag, the 7%-Ag/In2O3 sensor showed the highest response to ethanol (35.6 vs. 100 ppm, ppm=parts per million), which was about seven times higher than that of the pure In2O3 sensor at 270 ℃. The improved performance of the Ag-In2O3 composite sensor can be attributed to the catalytic effect of silver and the Schottky barrier formed at the Ag-In2O3 interface.

Key words: Ag, In2O3, Schottky barrier, Ethanol, Sensor