Abstract
Silica-titania hard optical coatings based on titania/organically modified silane composite materials were prepared by the sol-gel spin coating technique. Acid catalyzed solutions of methyltrimethoxysilane mixed with tetrapropylorthotitanate were used as precursors for the silica-titania coatings. Atomic force microscopy, thermal gravimetric analysis, UV-visible spectroscopy, and Fourier transform infrared spectroscopy have been used to investigate the optical and structural properties of the coatings. The results indicated that purely inorganic and crack-free silica-titania coatings could be obtained after heating at a temperature of 500 °C or higher. The hardness and Young's modulus of the coatings were characterized by a nanoindenter and they showed a dependence on the heat-treatment temperature and titanium content. Hardness as high as about 7.0 GPa was observed in a high titanium content coating heat-treated at 800 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 31-37 |
| Number of pages | 7 |
| Journal | Optical Materials |
| Volume | 22 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 2003 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- General Computer Science
- Atomic and Molecular Physics, and Optics
- Spectroscopy
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Electrical and Electronic Engineering
Keywords
- Hardness
- Optical coatings
- Optical properties
- Organically modified silane
- Sol-gel technique