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Synthesis of Dual Fluorescent Encoding Magnetic Composite Nanoparticles

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Abstract:

A new class of high stable, dual fluorescent encoding magnetic composite nanoparticle has been synthesized via reverse microemulsion method. Two kinds of CdTe QDs with different emission wavelengths and magnetic nanoparticles (Fe3O4 were embedded in silica nanoparticles at precisely controlled ratios. In this process, superparamagnetic Fe3O4 nanoparticles and one kind of QDs (573 nm) as cores were coated with silica, forming the first core–shell structure magnetic fluorescent nanoparticles (MFNs); then the MFNs and the other kind of QDs (653 nm) as cores were coated with another silica shell to form the fluorescent, magnetic dual core–shell encoding composite nanoparticles. With the aim of embedding more QDs in MFNs, we use poly(dimethyldiallyl ammonium chloride) to balance the electrostatic repulsion between QDs and silica intermediates. A surface-active reagent, 3-aminopropyltrimethoxysliane was used to link the MFNs with QDs and terminate the surface of composite nanoparticles. Finally, by modifying the surface of composite nanoparticles with amino groups and methylphosphonate groups, biologically functionalized and monodispersed composite nanoparticles were obtained.

Keywords: FLUORESCENT ENCODING; MAGNETIC PROPERTY; REVERSE MICROEMULSION METHOD; SILICA COMPOSITE NANOPARTICLES

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2063

Publication date: March 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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