Synthesis of Highly Fluorescent Silver Clusters on Gold(I) Surface Mainak Ganguly Anjali Pal Yuichi Negishi Tarasankar Pal 10.1021/la304835p.s001 https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Highly_Fluorescent_Silver_Clusters_on_Gold_I_Surface/2445106 Evolution of fluorescence from a giant core–shell particle is new and synergistic, which requires both gold and silver ions in an appropriate ratio in glutathione (GSH) solution. The formation of highly fluorescent Ag<sub>2</sub>/Ag<sub>3</sub> clusters on the surface of Au<sup>I</sup> assembly results in giant Au<sup>I</sup><sub>core</sub>–Ag<sup>0</sup><sub>shell</sub> water-soluble microparticles (∼500 nm). Here, Au<sup>I</sup> acts as the template for the generation of fluorescent Ag clusters. The presence of gold under the synthetic strategy is selective, and no other metal supports such synergistic evolution. The core–shell particle exhibits stable and static emission (emission maximum, 565 nm; quantum yield, 4.6%; and stroke shift, 179 nm) with an average lifetime of ∼25 ns. The drift of electron density by the Au<sup>I</sup> core presumably enhances the fluorescence. The positively charged core offers unprecedented long-term stability to the microparticles in aqueous GSH solution. 2013-02-12 00:00:00 565 nm fluorescence Fluorescent Silver Clusters microparticle electron density GSH solution 179 nm silver ions Ag clusters emission AuI core stroke shift AuI acts AuI assembly results