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