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5953555 
Journal Article 
Sub-ppm acetic acid gas sensor based on In2O3 nanofibers 
Wang, YuC; Sun, Z; Wang, SuZ; Wang, S; Cai, S; Huang, X; Li, Ke; Chi, Z; Pan, S; Xie, W 
2019 
No 
Journal of Materials Science
ISSN: 0022-2461
EISSN: 1573-4803 
Springer Nature 
NEW YORK 
54 
22 
14055-14063 
English 
WOS:000482914800014 
Metal oxide semiconductor sensors based on nanocrystalline In₂O₃ and its composites are found to be very sensitive in detecting low-concentration (~ 5 ppm) gases such as ozone, nitrogen dioxide, formaldehyde and butane. Here, we successfully obtained fiber-shaped In₂O₃ crystalline nanofibers via electrospun and calcination routes. The gas sensing properties of the In₂O₃ nanofibers were studied by exposing them to the acetic acid vapor with different concentrations from 500 ppb to 2000 ppm at the optimum operating temperature (250 °C). The device possesses ultra-high response of 66.7 toward 2000 ppm acetic acid vapor, low response and recovery times of 25 s and 37 s (100 ppm), respectively, and significant selectivity to acetic acid at 100 ppm. In particular, the sensor based on In₂O₃ nanofibers has very low detection limit and can reach 500 ppb. Therefore, the presented In₂O₃ nanofiber sensor can be used in practice in acetic acid detection area in the future. 
article; acetic acid; butanes; detection limit; formaldehyde; nanocrystals; nanofibers; nitrogen dioxide; semiconductors; temperature 
JOURNAL OF MATERIALS SCIENCE