Zhikun Wu,* Man Wang, Jiao Yang, Xiaohong Zheng, Weiping Cai, Guowen Meng, Huifeng Qian, Huimin Wang, and Rongchao Jin*
In this paper, the authors report the detection of Ag+ ions through fluorescence enhancement of gold nanoclusters. This response is unique to silver, as other metal cations result in fluorescence quenching. They also find that depending on the ligand, silver atoms can substitute gold atoms in the nanocluster. Otherwise, they find that oxidation of the nanoclusters and an undefined interaction between the nanocluster and neutral or cationic silver causes the fluorescence to increase compared to the gold nanocluster itself.