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Self‐assembly multifunctional nanocomposites with Fe 3 O 4 magnetic core and CdSe/ZnS quantum dots shell
Author(s) -
Zhang Ying,
Wang ShaoNing,
Ma Song,
Guan JiaoJiao,
Li Da,
Zhang XiangDong,
Zhang ZhiDong
Publication year - 2007
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31609
Subject(s) - materials science , quantum dot , nanocomposite , spectroscopy , squid , transmission electron microscopy , nanotechnology , nanoparticle , magnetic nanoparticles , chemical engineering , optoelectronics , ecology , physics , quantum mechanics , engineering , biology
This paper describes a new method for self‐assembling multifunctional nanocomposites with a magnetic core of iron oxide Fe 3 O 4 and a shell of CdSe/ZnS quantum dots (QDs). Two sol–gel processes were applied to form the uniform magnetic seeds (Fe 3 O 4 @SiO 2 ‐SH) and then the thiol coordination was used to bind the CdSe/ZnS QDs to the surface of the seeds. The multifunctional nanocomposites were characterized by means of transmission electron microscopy, X‐ray diffraction, energy disperse spectroscopy, fluorescence spectroscopy, infrared spectroscopy, and superconducting quantum interference device (SQUID) magnetometer. The results showed that the magnetic Fe 3 O 4 nanoparticles and the CdSe/ZnS fluorescent QDs were combined together. The nanocomposites were of spherical shape with a mean diameter of 25 nm and exhibited well magnetic response, photostability, chemical activity, and water miscibility. The method put forward here can also be extended to combine systems of other metal oxides and QDs to fabricate core‐shell nanocomposites with multifunction for biomedical applications. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008