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Investigation on sol–gel synthesized Ag-doped TiO2 cermet thin films
- Source :
- Thin Solid Films. 474:245-249
- Publication Year :
- 2005
- Publisher :
- Elsevier BV, 2005.
-
Abstract
- Undoped TiO 2 and Ag–TiO 2 (up to 23 at.% Ag) cermet thin films and polycrystalline powders have been prepared by sol–gel process. Their structure, composition, surface morphology and optical properties have been investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and ultraviolet–visible spectroscopy (UV–VIS spectroscopy). It has been observed that while Ag does not form a solid solution with TiO 2 , it promotes the anatase to rutile phase transformation. The transformation temperature decreases from 827 °C for undoped TiO 2 to about 650 °C for 23 at.% Ag-doped TiO 2 . SIMS analyses show that Ag is mostly present on the surface of the films. XPS studies confirm that these Ag are in the Ag 0 state. Optical analyses show that with increasing Ag content, the refractive index ( n ) increases and the optical absorption behavior of the cermet films is modified, but the band gap of the anatase TiO 2 is not influenced.
- Subjects :
- Anatase
Materials science
Scanning electron microscope
Metals and Alloys
Analytical chemistry
Surfaces and Interfaces
Cermet
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Secondary ion mass spectrometry
X-ray photoelectron spectroscopy
Differential thermal analysis
Materials Chemistry
Crystallite
Sol-gel
Subjects
Details
- ISSN :
- 00406090
- Volume :
- 474
- Database :
- OpenAIRE
- Journal :
- Thin Solid Films
- Accession number :
- edsair.doi...........315e08643cd1eadbb44681fd86c84aa3