Fabrication of nanocomposite particles with superparamagnetic and luminescent functionalities
- Institute of Bioengineering and Information Technology Materials, School of Materials Science and Engineering, Tongji University, Shanghai 200092 (China)
A new kind of superparamagnetic luminescent nanocomposite particles has been synthesized using a modified Stoeber method combined with an electrostatic assembly process. Fe{sub 3}O{sub 4} superparamagnetic nanoparticles were coated with uniform silica shell, and then 3-aminopropyltrimethoxysilane was used to terminate the silica surface with amino groups. Finally, negatively charged CdSe quantum dots (QDs) were assembled onto the surface of the amino-terminated SiO{sub 2}/Fe{sub 3}O{sub 4} nanoparticles through electrostatic interactions. X-ray diffraction (XRD), transmission electron microscopy (TEM), microelectrophoresis, UV-vis absorption and emission spectroscopy and magnetometry were applied to characterize the nanocomposite particles. Dense CdSe QDs were immobilized on the silica surface. The thickness of silica shell was about 35 nm and the particle size of the final products was about 100 nm. The particles exhibited favorable superparamagnetic and photoluminescent properties.
- OSTI ID:
- 21143959
- Journal Information:
- Materials Research Bulletin, Vol. 43, Issue 11; Other Information: DOI: 10.1016/j.materresbull.2007.12.006; PII: S0025-5408(07)00543-0; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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