期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 10, 页码 3274-3277出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b12456
关键词
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资金
- JSPS [25286001, 15H05737]
- Ministry of Education, Sports, Culture, Science and Technology, Japan (MEXT)
- CREST from the Japan Science and Technology Agency (JST)
- Cooperative Research Program of Nano-Macro Materials, Devices and System Research Alliance
- MEXT, Japan
- Grants-in-Aid for Scientific Research [15H05737, 25286001, 15K13261] Funding Source: KAKEN
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.
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