金属ナノクラスターの精密集積とイメージングを実現～階層性ナノ物質の自在構築に向けて～

2025-07-30 東京大学

金属ナノクラスターの二量体、直鎖型三量体、三角型三量体の電子顕微鏡像

＜関連情報＞

• https://www.s.u-tokyo.ac.jp/ja/press/10883/
• https://pubs.acs.org/doi/10.1021/acs.nanolett.5c02770

IrAu12ナノクラスターの二量体と三量体へのプログラムされた集合：電子顕微鏡観察と分光学的特性評価 Programmed Assembly of IrAu12 Nanoclusters into Dimers and Trimers: Electron Microscopy Observation and Spectroscopic Characterization

Yuto Fukumoto,Shinjiro Takano,Yosuke Asami,Haru Hirai,Koji Harano,and Tatsuya Tsukuda
Nano Letters  Published July 30, 2025
DOI:https://doi.org/10.1021/acs.nanolett.5c02770

Abstract

Ligand-protected gold nanoclusters have attracted attention as building blocks for functional materials. In this study, we have demonstrated the programmed assembly of the icosahedral Ir@Au₁₂ nanoclusters into a dimer, a linear trimer, linear oligomers, or a triangular trimer via the reaction between IrAu₁₂ with predefined binding sites and bi- or tridentate isocyanide linkers. The formation of the intended structures was confirmed by high-angle annular dark-field scanning transmission electron microscopy using a newly developed sampling protocol. Statistical analysis of the interparticle distances provided quantitative structure models consistent with the theoretically predicted structures. The linear oligomers exhibited a new absorption peak at ∼480 nm. Theoretical calculations indicated that the electron transfers from the IrAu₁₂ moiety to the linker ligand or another IrAu₁₂ moiety involve the absorption. This study demonstrates that programmed assemblies of Au nanoclusters will provide an opportunity to elucidate how novel collective properties arise through assembly.