Epitaxial Growth of High Dielectric Contrast Three-Dimensional Photonic Crystals
✍ Scribed by P. V. Braun; R. W. Zehner; C. A. White; M. K. Weldon; C. Kloc; S. S. Patel; P. Wiltzius
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 297 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0935-9648
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✦ Synopsis
The average size of the silver nanoparticles, prepared by the method of Korgel and co-workers [10], is approximately 5 nm. A solution containing 0.3 g of toluene and 0.5 mg of PS, with approximate molecular weight of 900 000, was then added to 0.5 mg of these silver nanocrystals in a vial. The corresponding volume ratio Ag/PS was estimated to be 0.1. The solution was sonicated for 20 min to evenly disperse the particles. Approximately 0.5 mL of the resulting solution was then cast on water, contained in a 3 inch petri dish. Evaporation of solvent was slowed by completely covering the dish. Under this condition, toluene molecules escaped from the tiny gap between the dish and its cover. After 1 h, the toluene evaporation was complete and a shining, wrinkle-free, purple colored nanocomposite film formed on the water surface. When the film preparation was accelerated by uncovering the dish, the toluene evaporation was non-uniform and wrinkles developed.