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CO sensitivity of La2O3-doped SnO2 thick film gas sensor
- Authors
- Choi, J. Y.; Oh, T. S.
- Issue Date
- 29-Nov-2013
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Gas sensor; Thick film; SnO2; La2O3; CO sensitivity
- Citation
- THIN SOLID FILMS, v.547, pp.230 - 234
- Journal Title
- THIN SOLID FILMS
- Volume
- 547
- Start Page
- 230
- End Page
- 234
- ISSN
- 0040-6090
- Abstract
- La2O3-doped SnO2 thick films were fabricated via powder mixing of SnO2 and La2O3, and their sensor responses to 10-75 ppm CO were characterized. The presence of La2O3 in a SnO2 thick film containing more than 1.3 at.% La2O3 was confirmed with X-ray diffraction performed at a slow scan rate of 0.5 degrees/min. The sensor response to 50 ppm CO at 350 degrees C was improved from 9.5 to 59.0 with the addition of 2.2 at.% La2O3 to SnO2. Compared to the CO sensitivity increase of the undoped SnO2 from 3.2 to 37.6, the 2.2 at.% La2O3-doped SnO2 exhibited a remarkable sensitivity improvement from 5.2 to 213.7 with an increase in the CO concentration from 10 ppm to 75 ppm. (C) 2013 Elsevier B. V. All rights reserved.
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