Investigation of Ag-Doping in Kinetically Sprayed SnO2 Composite Film and Its Application to Gas Sensor
- Authors
- Choi, Dahyun; Lee, Hee Chul; Kim, Hyojun; Kim, Hyeong-Gwan; Ji, Choon Woo; Son, Minhee; Lee, Sunyong Caroline
- Issue Date
- Nov-2019
- Publisher
- 한국정밀공학회
- Keywords
- SnO2; Gas sensor; Silver nanoparticles; Kinetic spraying; In situ deposition
- Citation
- International Journal of Precision Engineering and Manufacturing, v.20, no.11, pp.1989 - 1996
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- International Journal of Precision Engineering and Manufacturing
- Volume
- 20
- Number
- 11
- Start Page
- 1989
- End Page
- 1996
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/2056
- DOI
- 10.1007/s12541-019-00208-8
- ISSN
- 2234-7593
- Abstract
- We have developed a facile method to fabricate Ag-doped SnO2 composite film prepared via one-step kinetic spraying process. We used supersonic/subsonic nozzles to accelerate powders to their maximum kinetic energies when bombarding the substrates; no post-treatment was required. Under optimized conditions, sensors fabricated from SnO2-based films with and without Ag nanoparticles (NPs) were smooth and about 7 mu m in thickness. To improve CO-sensing performance, Ag NPs (to less than 1 wt%) were added to SnO2 films. The sensor response to CO of the film with 1 wt% Ag was up to 20-fold better than that of the Ag-free film, even a low CO concentration of 500 ppm. We thus confirmed that addition of a small amount of Ag NPs to a SnO2 film increased electron transport and improved catalysis of oxygen ionization on the film surface. Therefore, we have developed a facile method of Ag-doping in composite gas sensor and this crack-free composite gas sensor was found to be highly sensitive to CO gas.
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