Silica sol synthesized by two steps was deposited on Si(100) substrate by spin coating. After aging and washing the wet gel film was modified with TMCS (trimethylchlorosilane) to prevent additional condensation during drying. By detecting -CH3(C-H) substituted for -OH species, surface modification was identified by DTA and FTIR. Films dried were heated at different temperatures to investigate heating temperature effects on silica thin film properties. When heated in the range of temperatures (200-500°C), crack-free silica thin films with refractive indices of 1.23-1.15 and dielectric constant 2.2-2.8 were synthesized.
Bibliographical noteFunding Information:
The authors wish to appreciate ETRI (Electronic Telecommunicative Research Institute), for financial support of this work.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry