The properties of porous SiO2 xerogel film strongly depend on the aging process. The morphology of the surface modified SiO2 xerogel film pre-aged for 1 hr at 70 °C showed a two-dimensional structure. Aging for 12 h at 70 °C and successive modification of the film induced some particle growth and a three-dimensional network structure. The microstructure of the modified SiO2 xerogel films reflects the preformed structure during aging. The surface modification induced the changes of surface coverage from -OC2H5 and -OH bonds to -CH3. However the content of surface chemical species was almost same regardless of aging time. The porosity of the modified sample pre-aged for 12 h at 70 °C was 89%. The calculated/measured dielectric constants were 1.31/1.42, respectively.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films