期刊
APPLIED SURFACE SCIENCE
卷 259, 期 -, 页码 270-275出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.07.030
关键词
TiO2; Sol-gel; Annealing effect; Grain size; Surface roughness; Band gap; Activation energy; Hydrogen gas sensor
类别
资金
- Slovak Research and Development Agency (APVV) [LPP-0176-09, APVV-0199-10]
- Ministry of Education of the Slovak Republic [VEGA 1/0605/12]
- Comenius University [UK/96/2012]
- Research & Development Operational Programme [26220220004, 26240220002]
- ERDF
Thin films of titanium dioxide with thickness of about 150 nm were deposited by spin coating method on a sapphire substrate from a sol-gel and annealed at various temperatures (from 600 degrees C to 1000 degrees C). Structural, optical and hydrogen gas sensing properties of the films were investigated. The annealing temperatures from 600 to 800 degrees C led to anatase phase with grain size in the range of 14-28 nm. Further increase of the annealing temperature resulted in transformation to rutile phase with larger grain size of about 100-120 nm. The optical band gap tended to decrease with increasing annealing temperature. The estimated values of activation energy for charge transport were in the range of 0.6-1.0 eV for films annealed at temperatures from 600 degrees C to 800 degrees C and 0.37-0.38 eV for films annealed at 900 degrees C and 1000 degrees C. The films annealed at 900 degrees C and 1000 degrees C showed better hydrogen sensitivity, what can be at least partially caused by their higher surface roughness. (C) 2012 Elsevier B. V. All rights reserved.
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