Monodispersed spherical colloids of Se@CdSe: synthesis and use as building blocks in fabricating photonic crystals

Nano Lett. 2005 May;5(5):937-42. doi: 10.1021/nl050482i.

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

  • Evaluation Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Cadmium Compounds / analysis
  • Cadmium Compounds / chemistry*
  • Cadmium Compounds / radiation effects
  • Colloids / analysis
  • Colloids / chemistry*
  • Crystallization / methods*
  • Light
  • Materials Testing
  • Nanotechnology / instrumentation
  • Nanotechnology / methods*
  • Nanotubes / analysis
  • Nanotubes / chemistry*
  • Nanotubes / radiation effects
  • Nanotubes / ultrastructure*
  • Particle Size
  • Photochemistry / instrumentation
  • Photochemistry / methods*
  • Selenium / analysis
  • Selenium / chemistry
  • Selenium / radiation effects
  • Selenium Compounds / analysis
  • Selenium Compounds / chemistry*
  • Selenium Compounds / radiation effects
  • Semiconductors

Substances

  • Cadmium Compounds
  • Colloids
  • Selenium Compounds
  • cadmium selenide
  • Selenium