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

Zhiya Ma, Dosi Dosev, Mikaela Nichkova, Randy K. Dumas, Shirley J. Gee, Bruce D. Hammock, Kai Liu, Ian M. Kennedy

Research output: Contribution to journalArticle

46 Scopus citations

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 (Tb3+) 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.

Original languageEnglish (US)
Pages (from-to)1368-1371
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number10
DOIs
StatePublished - May 2009

Keywords

  • Core-shell structure
  • Lanthanide chelate
  • Magnetite nanoparticle
  • Multifunctional nanocomposite
  • Silica

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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