Monodispersed Spherical Colloids of Se@CdSe: Synthesis and Use as Building Blocks in Fabricating Photonic Crystals
- 21 April 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (5) , 937-942
- https://doi.org/10.1021/nl050482i
Abstract
Monodispersed spherical core−shell colloids of [email protected]2Se have been exploited as a chemical template to synthesize [email protected] core−shell particles using a cation-exchange reaction. A small amount of tributylphosphine could facilitate the replacement of Ag+ by Cd2+ in methanol at 50 °C to complete the conversion within 150 min. The orthorhombic structure of β-Ag2Se changed to a well-defined wurtzite lattice for CdSe. The CdSe shells could be converted back to β-Ag2Se by reacting with AgNO3 in methanol at room temperature. Because of the uniformity in size and high refractive index associated with the [email protected] core−shell colloids, they could serve as a new class of building blocks to fabricate photonic crystals with wide and strong stop bands.Keywords
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