Regioselectively Controlled Synthesis of Colloidal Mushroom Nanostructures and Their Hollow Derivatives
Regioselectively Controlled Synthesis of Colloidal Mushroom Nanostructures and Their Hollow Derivatives
复制标题
区域选择性控制合成胶体蘑菇纳米结构及其空心衍生物
DOI：
10.1021/ja101270r
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发表时间：
2010-05-19
影响因子：
15
通讯作者：
Lu, An-Hui
中科院分区：
文献类型：
--
作者：
Feyen, Mathias;Weidenthaler, Claudia;Lu, An-Hui
本研究建立了一条简便、可控的制备蘑菇纳米结构(FexOy@PSD-SiO_2)及其中空衍生物的合成路线。该合成方法是在Fe3Oy(Fe3O4或Fe2O3)表面部分包覆聚合物微球，然后在其表面附着二氧化硅半球体。在Janus-type FexOy@PSD纳米球上的表面可达的FexOy纳米粒子是指导FexOy@PSD种子上的二氧化硅半球生长的关键。在斯托伯式工艺中，通过调整TEOS的使用量和添加适当的表面活性剂，可以调节二氧化硅半球的大小和孔隙率。在用浓盐酸浸出氧化铁核后，得到了内部中空的蘑菇纳米结构，其中中空内部的形态忠实地复制了以前填充这一空隙的氧化铁核的形状。这种合成策略为大规模制备非对称胶体纳米结构提供了一种可控的方法，可以作为组装新型纳米结构的构建块。
In this study, a facile and controllable synthetic route for the fabrication of mushroom nanostructures (FexOy@PSD-SiO2) and their hollow derivatives has been established. The synthesis consists of partial coating of FexOy (Fe3O4 or Fe2O3) with polymer spheres, followed by attaching silica hemispheres. The surface-accessible FexOy nanoparticles on the Janus-type FexOy@PSD nanospheres are key for directing the growth of the silica hemisphere on the FexOy@PSD seeds. The size and the porosity of the silica hemispheres are tunable by adjusting the amount of TEOS used and addition of a proper surfactant in a Stober-type process. After the iron oxide cores were leached out with concentrated HCl, mushroom nanostructures with hollow interiors were obtained, where the morphology of the hollow interior faithfully replicates the shape of the iron oxide core previously filling this void. This synthetic strategy provides a controllable method for the large-scale preparation of asymmetric colloidal nanostructures which could serve as building blocks for the assembly of new types of nanostructures.