Controlled Fabrication of Iron Oxide/Mesoporous Silica Core鈥揝hell Nanostructures

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• 作者：Mingwei Zhang ; Kegong Fang ; Minggui Lin ; Bo Hou ; Liangshu Zhong ; Yan Zhu ; Wei Wei ; Yuhan Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 17, 2013
• 年：2013
• 卷：117
• 期：41
• 页码：21529-21538
• 全文大小：695K
• 年卷期：v.117,no.41(October 17, 2013)
• ISSN：1932-7455

文摘

A simple and reproducible method for the preparation of well-defined iron oxide/mesoporous silica core鈥搒hell nanostructure is provided. Iron oxide nanocubes with a narrow size distribution were synthesized through a novel ethanol/acetic acid system using Fe(NO₃)路9H₂O as an iron source and polyvinylpyrrolidone as a capping agent under mild solvothermal conditions (200 掳C). These monodisperse nanoparticles were used directly as the core for the deposition of a mesoporous silica shell via a sol鈥揼el process, resulting in uniform core鈥搒hell Fe₂O₃@SiO₂ composites with tailored silica shell thickness and controllable core morphology. In addition, composition as well as magnetization of the reduced core鈥搒hell composites could easily be controlled by a reduction process. Furthermore, the iron oxide core in Fe₂O₃@SiO₂ could be completely etched to produce hollow SiO₂ nanospheres. The mechanism of formation of the core鈥搒hell structure was also proposed by the aid of IR spectrum analysis.