Highly Fluorescent Gold Cluster Assembly

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Chang, Hogeun; Karan, Niladri S.; Shin, Kwangsoo; Bootharaju, Megalamane S.; Nah, Sanghee; Chae, Sue In; Baek, Woonhyuk; Lee, Sanghwa; Kim, Junhee; Son, Young Ju; Kang, Taegyu; Ko, Giho; Kwon, Seung-Hae; Hyeon, Taeghwan

Issue Date
American Chemical Society
Journal of the American Chemical Society, Vol.143 No.1, pp.326-334
The photoluminescence (PL) of metal nanoclusters (NCs), originating from their molecule-like electronic structure, is one of the most intriguing properties of NCs. Although various strategies such as tailoring the size, structure, and chemical environment of NCs have shown to improve the PL, their quantum yields (QYs) are still lagging far behind those of conventional luminescent materials, including quantum dots and organic fluorophores. Herein, we report the synthesis of highly luminescent gold cluster assembly (GCA) from Zn2+-tion-mediated assembly of Au-4 (SRCOO-)(4) clusters using mercaptocarboxylic acid as a protective ligand and reductant as well as a growth suppressor. The synergetic combination of unique aurophilic interactions among Au(4)clusters and the rigidified chemical environment induced by metal ion chelation through carboxylate groups is responsible for the ultrabright greenish-blue fluorescence with a QY up to 90%. Furthermore, the unique flexibility of dis/reassembly and the aggregation-dependent strong fluorescence of GCA offer a great potential for applications in biodegradable and trackable drug delivery systems.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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