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Synthesis and characterization of multifunctional silica core-shell nanocomposites with magnetic and fluorescent functionalities.

  • Author(s): Ma, Zhiya
  • Dosev, Dosi
  • Nichkova, Mikaela
  • Dumas, Randy K
  • Gee, Shirley J
  • Hammock, Bruce D
  • Liu, Kai
  • Kennedy, Ian M
  • et al.
Abstract

Multifunctional core-shell nanocomposites with a magnetic core and a silica shell doped with lanthanide chelate have been prepared by a simple method. First, citric acid-modified magnetite nanoparticles were synthesized by a chemical coprecipitation method. Then the magnetite nanoparticles were coated with silica shells doped with terbium (Tb(3+)) complex by a modified Stöber method based on hydrolyzing and condensation of tetraethyl orthosilicate (TEOS) and a silane precursor. These multifunctional nanocomposites are potentially useful in a variety of biological areas such as bio-imaging, bio-labeling and bioassays because they can be simultaneously manipulated with an external magnetic field and exhibit unique phosphorescence properties.

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