Thiolate-protected gold nanoparticles via physical approach: Unusual structural and photophysical characteristics

Yohei Ishida, Ikumi Akita, Taiki Sumi, Masaki Matsubara, Tetsu Yonezawa

研究成果: Article査読

28 被引用数 (Scopus)


Here we report a novel physical approach for thiolate-protected fluorescent gold nanoparticles with a controlled size of the order of a few nanometers. This approach is based on a sputtering of gold into a liquid matrix containing thiolate ligand as a stabilizer at various concentrations, thus no reductant was used. The size of the gold nanoparticles was successfully controlled to range from 1.6 to 7.4 nm by adjusting the thiol concentrations. Surface plasmon absorption was observed in larger nanoparticles, but it was not observed in smaller ones. Such smaller nanoparticles fluoresced at around 670 nm with a small spectral shift according to their size, however, the diameter (1.6-2.7 nm) was very strange to show such red emission compared with photophysical characteristics of reported gold cluster or nanoparticles synthesized by chemical method. By detailed investigations using TEM, HAADF-STEM, XPS, and TGA, and size fractionation by size exclusion chromatography, we finally arrived at the plausible mechanism for the origin of unusual fluorescence property; the obtained gold nanoparticles are not single-crystal and are composed of aggregates of very small components such as multinuclear gold clusters or complexes.

ジャーナルScientific reports
出版ステータスPublished - 2016 7月 18

ASJC Scopus subject areas

  • 一般


「Thiolate-protected gold nanoparticles via physical approach: Unusual structural and photophysical characteristics」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。