Yolk/Shell Assembly of Gold Nanoparticles by Size Segregation in Solution
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- 作者：Jinjian Wei ; Kenichi Niikura ; Takeshi Higuchi ; Takashi Kimura ; Hideyuki Mitomo ; Hiroshi Jinnai ; Yasumasa Joti ; Yoshitaka Bessho ; Yoshinori Nishino ; Yasutaka Matsuo ; Kuniharu Ijiro
- 刊名：Journal of the American Chemical Society
- 出版年：2016
- 出版时间：March 16, 2016
- 年：2016
- 卷：138
- 期：10
- 页码：3274-3277
- 全文大小：342K
- ISSN：1520-5126
文摘
We demonstrate that binary mixtures of small and large gold nanoparticles (GNPs) (5/15, 5/30, 10/30, and 15/30 nm in diameter) in the presence of a glucose-terminated fluorinated oligo(ethylene glycol) ligand can spontaneously form size-segregated assemblies. The outermost layer of the assembly is composed of a single layer of small-sized GNPs, while the larger-sized GNPs are located in the interior, forming what is referred to as a yolk/shell assembly. Time course study reveals that small and large GNPs aggregate together, and these kinetically trapped aggregations were transformed into a size-segregated structure by repeating fusions. A yolk/shell structure was directly visualized in solution by X-ray laser diffraction imaging, indicating that the structure was truly formed in solution, but not through a drying process.