Preparation and application of magnetic cobalt/SiO2 core/shell nanospheres

Homogeneous SiO2-coated cobalt nanospheres with tunable silica shell thickness from 21.7nm to 4.5nm were synthesized by using modified Stober method. These nanocomposites were used as source materials to prepare SiO2 semi-hollow and hollow nanospheres by partially and completely etching cobalt cores...

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Bibliographic Details
Published in:Materials letters 2012-01, Vol.66 (1), p.285-288
Main Authors: Xu, Mengshi, Qiao, Ru, Zhang, Xiao Li, Kang, Young Soo, Li, Liang-Chao
Format: Article
Language:English
Subjects:
Cadmium sulfides
Cobalt
Nanocomposites
Nanomaterials
Nanospheres
Nanostructure
Shells
Silicon dioxide
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Summary:Homogeneous SiO2-coated cobalt nanospheres with tunable silica shell thickness from 21.7nm to 4.5nm were synthesized by using modified Stober method. These nanocomposites were used as source materials to prepare SiO2 semi-hollow and hollow nanospheres by partially and completely etching cobalt cores, respectively. A proposed formation mechanism of these Co/SiO2 nanospheres with a core/shell structure was presented in this paper, which is also important for the rational design and synthesis of other monodisperse core/shell nanoarchitectures with uniform size and shape. Furthermore, these Co/SiO2 nanospheres were also used as a substrate for the deposition of CdS nanocrystals to prepare magnetic luminescent Co/SiO2/CdS nanocomposites.
ISSN:0167-577X
DOI:10.1016/j.matlet.2011.09.004