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Abstract
Highly monodispersed colloidal silica spheres in submicrometer sizes were synthesized by a chemical method.The sizes of silica spheres measured by transmission electron microscopy range from 200 to 600 nm in diameter, and its distribution standard deviation is less than 5%.Scanning Electron Microscopy images show that using selfcrystallization of the silica spheres, we have successfully obtained artificial opals with the three dimensional closepacked, facecentered cubic (fcc) silica matrixes. Reflection spectra study reveals that artificial opals show (111) directional photonic bandgap features.
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