Incorporation of iron oxide nanoparticles and quantum dots into silica microspheres

ACS Nano. 2008 Feb;2(2):197-202. doi: 10.1021/nn700344x.

Abstract

We describe the synthesis of magnetic and fluorescent silica microspheres fabricated by incorporating maghemite (gamma-Fe2O3) nanoparticles (MPs) and CdSe/CdZnS core/shell quantum dots (QDs) into a silica shell around preformed silica microspheres. The resultant approximately 500 nm microspheres have a narrow size distribution and show uniform incorporation of QDs and MPs into the shell. We have demonstrated manipulation of these microspheres using an external magnetic field with real-time fluorescence microscopy imaging.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Crystallization / methods*
  • Ferric Compounds / chemistry*
  • Macromolecular Substances / chemistry
  • Magnetics / methods*
  • Materials Testing
  • Microspheres
  • Molecular Conformation
  • Nanostructures / chemistry*
  • Nanostructures / ultrastructure*
  • Nanotechnology / methods
  • Particle Size
  • Quantum Dots*
  • Silicon Dioxide / chemistry*
  • Surface Properties

Substances

  • Ferric Compounds
  • Macromolecular Substances
  • ferric oxide
  • Silicon Dioxide