title: Yolk/Shell Assembly of Gold Nanoparticles by Size Segregation in Solution.
abstract: 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.
authors.affiliation: Graduate School of Chemical Science and Engineering, Hokkaido University , Sapporo 060-8628, Japan.
authors.forename: Jinjian
authors.initials: J
authors.lastname: Wei
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Niikura
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , Sendai, Miyagi 980-8577, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Higuchi
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kimura
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Mitomo
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , Sendai, Miyagi 980-8577, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Jinnai
authors.affiliation: Japan Synchrotron Radiation Research Institute/SPring-8 , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Joti
authors.affiliation: RIKEN SPring-8 Center , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.|Institute of Physics, Academia Sinica , 128 Sec. 2, Academia Rd., Nankang, Taipei 11529, Taiwan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Bessho
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Nishino
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Matsuo
authors.affiliation: Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0021, Japan.
authors.forename: Kuniharu
authors.initials: K
authors.lastname: Ijiro