Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres: Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect
- Authors
- Kim, Jun-Sik; Na, Chan Woong; Kwak, Chang-Hoon; Li, Hua-Yao; Yoon, Ji Won; Kim, Jae-Hyeok; Jeong, Seong-Yong; Lee, Jong-Heun
- Issue Date
- 17-7월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- oxide semiconductor gas sensor; indium oxide; praseodymium; humidity dependence; cyclic redox reactions
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.28, pp.25322 - 25329
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 11
- Number
- 28
- Start Page
- 25322
- End Page
- 25329
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/64092
- DOI
- 10.1021/acsami.9b06386
- ISSN
- 1944-8244
- Abstract
- Pure and 3-12 at. % Pr-doped In2O3 macroporous 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 In2O3 sensor exhibited approximately the same acetone responses and sensor resistances at 450 degrees C regardless of the humidity variation, whereas the pure In2O3 exhibited 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 In2O3 sensor exhibited a high response to acetone with negligible cross responses to interfering gases (NH3, CO, benzene, toluene, NO2, and H-2) 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.
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