Incorporation of iron oxide nanoparticles and quantum dots into silica microspheres

Numpon Insin, Joseph B Tracy, Hakho Lee, John P Zimmer, Robert M Westervelt, Moungi G Bawendi
ACS Nano 2008, 2 (2): 197-202
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.

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