Preparation and characterization of TiO2 hybrid sol for UV-curable high-refractive-index organic–inorganic hybrid thin films
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In this study, UV-curable hybrid thin films were successfully prepared from TiO2 and TiO2 hybrid sols containing the acrylic monomer DPHA on PMMA substrates. The prepared TiO2 and TiO2 hybrid sols showed long-term storage stability and can provide operating control for the preparation of high-refractive-index hybrid thin films. The existence of interaction between the TiO2 particle and the coupling agent was evidenced by FT-IR and UV–visible spectra. All hybrid thin films showed good adhesion to the PMMA substrate with refractive index falling over the range 1.64–1.77. These results suggested the potential application of present TiO2 hybrid films in optical devices, such as anti-reflective coatings.
KeywordsTiO2 sol Sol–gel High refractive index Optical thin film UV-curing Particle size Plastic substrate
This work was supported by Chung Shan Institute of Science and Technology, Taiwan.