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Humidity-Independent Gas Sensors Using Pr-Doped In2O3Macroporous Spheres: Role of Cyclic Pr3+/Pr4+Redox Reactions in Suppression of Water-Poisoning Effect
- Source :
- ACS Applied Materials & Interfaces; July 2019, Vol. 11 Issue: 28 p25322-25329, 8p
- Publication Year :
- 2019
-
Abstract
- Pure and 3–12 at. % Pr-doped In2O3macroporous spheres were fabricated by ultrasonic spray pyrolysis and their acetone-sensing characteristics under dry and humid conditions were investigated to design humidity-independent gas sensors. The 12 at. % Pr-doped In2O3sensor exhibited approximately the same acetone responses and sensor resistances at 450 °C regardless of the humidity variation, whereas the pure In2O3exhibited significant deterioration in gas-sensing characteristics upon the change in the atmosphere, from dry to humid (relative humidity: 80%). Moreover, the 12 at. % Pr-doped In2O3sensor exhibited a high response to acetone with negligible cross responses to interfering gases (NH3, CO, benzene, toluene, NO2, and H2) under the highly humid atmosphere. The mechanism for the humidity-immune gas-sensing characteristics was investigated by X-ray photoelectron and diffuse reflectance infrared Fourier transform spectroscopies together with the phenomenological gas-sensing results and discussed in relation with Pr3+/Pr4+redox pairs, regenerative oxygen adsorption, and scavenging of hydroxyl groups.
Details
- Language :
- English
- ISSN :
- 19448244
- Volume :
- 11
- Issue :
- 28
- Database :
- Supplemental Index
- Journal :
- ACS Applied Materials & Interfaces
- Publication Type :
- Periodical
- Accession number :
- ejs50464355
- Full Text :
- https://doi.org/10.1021/acsami.9b06386