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Synthesis and characterization of core∕shell Fe3O4∕ZnSe fluorescent magnetic nanoparticles

By José M. Vargas, Amber A. McBride, John B. Plumley, Yann Fichou, Tosifa A. Memon, Vichiksha Shah, Nathaniel C. Cook, Brian A. Akins, Antonio C. Rivera, Gennady A. Smolyakov, James R. O’Brien, Natalie L. Adolphi, Hugh D. C. Smyth and Marek Osiński

Abstract

We report on the successful preparation and characterization of fluorescent magnetic core∕shell Fe3O4∕ZnSe nanoparticles (NPs) with a spherical shape by organometallic synthesis. The 7 nm core∕3 nm shell NPs show good magnetic and photoluminescence (PL) responses. The observed PL emission∕excitation spectra are shifted to shorter wavelengths, compared to a reference ZnSe NP sample. A dramatic reduction of PL quantum yield is also observed. The temperature dependence of the magnetization for the core∕shell NPs shows the characteristic features of two coexisting and interacting magnetic (Fe3O4) and nonmagnetic (ZnSe) phases. Compared to a reference Fe3O4 NP sample, the room-temperature Néel relaxation time in core∕shell NPs is three times longer

Topics: Proceedings of the 55th Annual Conf ...
Publisher: American Institute of Physics
OAI identifier: oai:pubmedcentral.nih.gov:3089650
Provided by: PubMed Central
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