Abstract
Monodispersed spherical core-shell colloids of Se@Ag(2)Se have been exploited as a chemical template to synthesize Se@CdSe core-shell particles using a cation-exchange reaction. A small amount of tributylphosphine could facilitate the replacement of Ag(+) by Cd(2+) in methanol at 50 degrees C to complete the conversion within 150 min. The orthorhombic structure of beta-Ag(2)Se changed to a well-defined wurtzite lattice for CdSe. The CdSe shells could be converted back to beta-Ag(2)Se by reacting with AgNO(3) in methanol at room temperature. Because of the uniformity in size and high refractive index associated with the Se@CdSe core-shell colloids, they could serve as a new class of building blocks to fabricate photonic crystals with wide and strong stop bands.
Publication types
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Evaluation Study
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Cadmium Compounds / analysis
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Cadmium Compounds / chemistry*
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Cadmium Compounds / radiation effects
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Colloids / analysis
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Colloids / chemistry*
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Crystallization / methods*
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Light
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Materials Testing
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Nanotechnology / instrumentation
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Nanotechnology / methods*
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Nanotubes / analysis
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Nanotubes / chemistry*
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Nanotubes / radiation effects
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Nanotubes / ultrastructure*
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Particle Size
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Photochemistry / instrumentation
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Photochemistry / methods*
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Selenium / analysis
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Selenium / chemistry
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Selenium / radiation effects
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Selenium Compounds / analysis
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Selenium Compounds / chemistry*
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Selenium Compounds / radiation effects
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Semiconductors
Substances
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Cadmium Compounds
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Colloids
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Selenium Compounds
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cadmium selenide
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Selenium