Published in
American Institute of Physics, Journal of Applied Physics, 7(109), p. 07B536
DOI: 10.1063/1.3565190
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- American Institute of Physics
- [www.ncbi.nlm.nih.gov] | PDF
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Synthesis and characterization of core∕shell Fe3O4∕ZnSe fluorescent magnetic nanoparticles
,
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,
Marek Osiński
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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.