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Keywords:

  • Cadmium selenide;
  • Cadmium sulfide;
  • Core–shell particles;
  • Fluorescence;
  • Microspheres;
  • Nanocrystals
Thumbnail image of graphical abstract

Silica microspheres coated with a silica or titania shell containing fluorescent semiconductor nanocrystals are described. Since the coating process does not affect the monodispersity of the silica microspheres, microspheres of a defined size and emission wavelength, potentially useful for biological applications, can be fabricated. The Figure shows 100 nm diameter blue-light-emitting and 500 nm diameter red-light-emitting microspheres circulating in the brain of a mouse.