Here, we report the synthesis of dopamine (DA)-mediated Au–Ag bimetallic nanoclusters in aqueous solution under UV activation. The success story emerges from monometallic fluorescent nanocluster evolution from photoactivation of gold as well as silver precursor compounds along with DA. The intriguing fluorescence property of the nanocluster relates to facile incorporation of Ag in Au, showing a 6-fold enhancement of the emission profile than simply DA-mediated Au nanoclusters. Silver effect, which is classified under the synergism, is the main reason behind such enhancement of fluorescence. The as-synthesized nanoclusters are robust and can be vacuum-dried and redispersed for repetitive application. The intriguing fluorescence of bimetallic nanoclusters is found to be quenched selectively in the presence of sulfide ion in an aqueous medium, paving the way for nanomolar detection of sulfide in water. The utility of the sensing platform has been verified employing different environmental water effluents.

中文翻译：

---

紫外线激活下银介导的增强型荧光金-银纳米团簇的演化：传感平台

在这里，我们报道了在紫外线激活下，多巴胺（DA）介导的水溶液中金-银双金属纳米团簇的合成。成功的故事来自于金，银前体化合物以及DA的光活化产生的单金属荧光纳米团簇。纳米簇的引人入胜的荧光特性与在Au中轻松掺入Ag有关，显示出与简单的DA介导的Au纳米簇相比，发射谱增强了6倍。被归类为协同作用的银效应是这种荧光增强的主要原因。合成后的纳米团簇坚固耐用，可以真空干燥并重新分散以重复使用。发现在水性介质中，在存在硫化物离子的情况下，双金属纳米簇的迷人荧光被选择性淬灭，为纳摩尔检测水中的硫化物铺平了道路。传感平台的实用性已通过使用不同的环境废水进行了验证。