Abstract
Porous thin films of SnO2 were prepared on an alumina substrate using hydrothermally synthesized SnO2 sol, to investigate the influences of film-preparation conditions on the microstructure and H2S sensing characteristics of the thin films obtained. The sensitivity and response transient to 5 ppm H2S in air depended significantly on calcination temperature, operating temperature and film thickness. The 0.6 μm-thick SnO2 film calcined at an optimum temperature of 700°C exhibited gas sensitivity (the ratio of electrical resistance in air to that in gas) as high as 550 together with good response transient characteristics to 5 ppm H2S in air at 200°C. The crystallite size of SnO2 as well as the pore size increased uniformly with a rise in calcination temperature, growing to 17.4 nm and 21 nm, at 700°C, respectively. The formation of well-defined large mesopores appears to be responsible for the excellent H2S sensing characteristics.
Original language | English |
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Pages (from-to) | 409-414 |
Number of pages | 6 |
Journal | Journal of the Ceramic Society of Japan |
Volume | 104 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1996 |
Keywords
- Gas sensor
- Hydrogen sulfide
- Microstructure
- Pore size
- Sol
- Thin film
- Tin oxide
ASJC Scopus subject areas
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry