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Preparation and Characterization of Silica-Coated Magnetic-€“Fluorescent Bifunctional Microspheres

Xiao, Qi and Xiao, Chong (2009) Preparation and Characterization of Silica-Coated Magnetic-€“Fluorescent Bifunctional Microspheres. Nanoscale Research Letters, 4 (9). pp. 1078-1084. ISSN 1931-7573 (Print) 1556-276X (Online)

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Abstract

Bifunctional magnetic–fluorescent composite nanoparticles (MPQDs) with Fe3O4 MPs and Mn:ZnS/ZnS core–shell quantum dots (QDs) encapsulated in silica spheres were synthesized through reverse microemulsion method and characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, vibration sample magnetometer, and photoluminescence (PL) spectra. Our strategy could offer the following features: (1) the formation of Mn:ZnS/ZnS core/shell QDs resulted in enhancement of the PL intensity with respect to that of bare Mn:ZnS nanocrystals due to the effective elimination of the surface defects; (2) the magnetic nanoparticles were coated with silica, in order to reduce any detrimental effects on the QD PL by the magnetic cores; and (3) both Fe3O4 MPs and Mn:ZnS/ZnS core–shell QDs were encapsulated in silica spheres, and the obtained MPQDs became water soluble. The experimental conditions for the silica coating on the surface of Fe3O4 nanoparticles, such as the ratio of water to surfactant (R), the amount of ammonia, and the amount of tetraethoxysilane, on the photoluminescence properties of MPQDs were studied. It was found that the silica coating on the surface of Fe3O4 could effectively suppress the interaction between the Fe3O4 and the QDs under the most optimal parameters, and the emission intensity of MPQDs showed a maximum. The bifunctional MPQDs prepared under the most optimal parameters have a typical diameter of 35 nm and a saturation magnetization of 4.35 emu/g at room temperature and exhibit strong photoluminescence intensity.

Item Type:Article
Uncontrolled Keywords:Bifunctional microspheres - Magnetic - Fluorescent
Subjects:Material Science > Nanofabrication processes and tools
Analytical Science > Metrology and standards in nanotechnology
ID Code:6925
Deposited By:Lesley Tobin
Deposited On:15 Sep 2009 16:18
Last Modified:15 Sep 2009 16:18

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