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Journal of Nanoparticle Research

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01-02-2012 | Research Paper

Synthesis and characterization of superparamagnetic nanoparticles coated with fluorescent gold nanoclusters

Authors: Xavier Le Guével, Eva-Marie Prinz, Robert Müller, Rolf Hempelmann, Marc Schneider

Published in: Journal of Nanoparticle Research | Issue 2/2012

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Abstract

Multifunctional nanoparticles (NPs) combining the superparamagnetism of Mn−Zn ferrite and the fluorescence property of gold nanoclusters (NCs) have been prepared by wet chemistry. Magnetic NPs synthesized by co-precipitation method were coated several times with oppositely charged polyelectrolytes (PEs) using the layer-by-layer technique. Common techniques (Fourier transform infrared spectroscopy, electron microscopy, zeta potential, etc.) indicated the monodispersity and the stability of the coated NPs providing a positive charged surface. Fluorescent gold NCs bound to a standard protein bovine serum albumin were adsorbed on the surface of the magnetic NPs. Structural investigations proved the presence of small gold clusters (~2 nm) in a shell surrounding the magnetic nanomaterial. The stable nanocomposite kept the original fluorescence property of the metal clusters with 211-fold increase of the red emission (λ = 690 nm) compared to the uncoated NPs. These NPs can be moved with a permanent magnet despite a 72-wt% increase of the non-magnetic fraction due to the PE coating and the protein adsorption.

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Title: Synthesis and characterization of superparamagnetic nanoparticles coated with fluorescent gold nanoclusters
Authors: Xavier Le Guével
Eva-Marie Prinz
Robert Müller
Rolf Hempelmann
Marc Schneider
Publication date: 01-02-2012
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 2/2012
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-012-0727-6

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