A Self-Templated Route to Hollow Silica Microspheres

被引:252
|
作者
Zhang, Tierui [1 ]
Zhang, Qiao [1 ]
Ge, Jianping [1 ]
Goebl, James [1 ]
Sun, Minwei [2 ]
Yan, Yushan [2 ]
Liu, Yi-Sheng [3 ,4 ]
Chang, Chinglin [3 ]
Guo, Jinghua [4 ]
Yin, Yadong [1 ]
机构
[1] Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA
[3] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan
[4] Lawrence Berkeley Lab, Berkeley, CA 94720 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 08期
关键词
RAY-ABSORPTION SPECTROSCOPY; OPTICAL-PROPERTIES; SHELL STRUCTURE; SPHERES; NANOPARTICLES; FABRICATION; PARTICLES; FUNCTIONALIZATION; NANOSTRUCTURES; ENCAPSULATION;
D O I
10.1021/jp810360a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A simple, mild, and effective self-templated approach has been developed to directly convert solid SiO(2) microspheres into hollow structures. The reaction involves initial partial dissolution of silica cores in a NaBH(4) solution and subsequent shell formation due to the redeposition of the silicate species back onto the colloid surfaces. The increasing concentration of NaBO(2) as the result of the slow decomposition of NaBH(4) in water is found to be responsible for the regrowth of the silica shell. This method allows the production of hollow silica spheres with sizes ranging from similar to 70 nanometers to several micrometers, largely determined by the size of the starting silica colloids. The solid-to-hollow transformation mechanism is investigated in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR) spectrometry, X-ray absorption spectroscopy (XAS), N(2) adsorption-desorption, and X-ray diffraction (XRD). We also study the reaction conditions that allow control over the wall thickness, surface morphology, and shell porosity.
引用
收藏
页码:3168 / 3175
页数:8
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