Pure and Pr-doped Ce4W9O33 with superior hydroxyl scavenging ability: humidity-independent oxide chemiresistors
- Authors
- Kim, Jun-Sik; Kim, Ki Beom; Li, Hua-Yao; Na, Chan Woong; Lim, Kyeorei; Moon, Young Kook; Yoon, Ji Won; Lee, Jong-Heun
- Issue Date
- 14-8월-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.30, pp.16359 - 16369
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 9
- Number
- 30
- Start Page
- 16359
- End Page
- 16369
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136851
- DOI
- 10.1039/d1ta02618f
- ISSN
- 2050-7488
- Abstract
- Water poisoning has been a long-standing problem in oxide semiconductor gas sensors. Herein, for the first time, we report that pure and Pr-doped Ce4W9O33 provide humidity-independent gas sensing characteristics. Ce4W9O33 and Pr-doped Ce4W9O33 powders with a porous structure have been successfully prepared by ultrasonic spray pyrolysis and subsequent annealing at low temperature (600 degrees C). Interestingly, these p-type oxide semiconductors exhibited nearly the same gas sensing characteristics at 300 degrees C regardless of humidity variation, whereas pure WO3 showed a significant decrease of sensor resistance and gas response when the atmosphere is changed from dry to relative humidity 80%. Furthermore, Ce4W9O33-based sensors showed highly selective and sensitive detection of ppm-level trimethylamine (TMA). Moisture-endurant gas sensing characteristics were discussed in relation to surface regeneration through the hydroxyl scavenging reaction assisted by abundant Ln(3+) (Ln = Ce, Pr) in (Ce1-xPrx)(4)W9O33 (x = 0-0.3) and TMA selectivity was explained by the acid-base interaction between the analyte gas and sensing material. Phase-pure ternary or quaternary oxides with a decreased oxidation state of lanthanide components provide a new and general strategy to design humidity-independent gas sensors with new functionality.
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