Abstract
Titania/ormosils organic-inorganic hybrid films with a thickness of approximately 1.55-μm were prepared as planar waveguides by a single spin-coating process and low temperature heat treatment. Acid-catalyzed solutions, firstly, γ-glycidoxypropyltrimethoxysilane (GLYMO) mixed with tetrapropylorthotitanate, secondly, methyltrimethoxysilane (MTES) mixed with tetrapropylorthotitanate, and thirdly, γ-glycidoxypropyltrimethoxysilane and methyltrimethoxysilane mixed with tetrapropylorthotitanate were used as precursors. Purely inorganic, crack-free and highly transparent silica-titania films with a thickness of more than 0.5-μm were also obtained after a heat treatment temperature of 500 °C. Films were characterized by thermal gravimetric analysis, and certain optical tools such as UV-visible spectra, Fourier transform infrared spectra and Raman spectra. The obtained results indicate that the GLYMO derived films show more shrinkage and the GLYMO and MTES derived films higher refractive index during heating. The hardness and Young's modulus of the films were characterized by a nanoindenter. Hardness as high as 6.83 GPa was obtained in GLYMO and MTES derived film after being heat-treated at 800 °C. It has been proposed that the high hardness of the film could be related to the carbon and high titanium content in the film.
| Original language | English |
|---|---|
| Pages (from-to) | 196-202 |
| Number of pages | 7 |
| Journal | Thin Solid Films |
| Volume | 436 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jul 31 2003 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry
Keywords
- Deposition process
- Hardness
- Optical coating
- Optical spectroscopy