青霉胺稳定的铜/银双金属纳米簇制备及其在银离子检测中的应用

Preparation of Copper/Silver Bimetallic Nanoclusters Stabilized by Penicillamine and Their Application in Silver Ion Detection

以青霉胺(DPA)为还原剂和稳定剂,通过一锅法一步制备了青霉胺稳定的铜/银双金属纳米簇(DPA-Cu/Ag NCs),并将其作为一种传感器用于检测水样中的银离子。该银离子传感器具有价格低廉、分析速度快速、选择性高等特点。采用透射电子显微镜(TEM)等方法表征了DPA-Cu/Ag NCs的结构及其化学组成,并通过荧光光谱和紫外-可见光谱法研究了DPA-Cu/Ag NCs的光学性质。结果表明,该DPA-Cu/Ag NCs在激发波长为300 nm时的最大发射波长为555 nm,其溶液在可见光照射下呈现乳白色,在紫外灯照射下则呈现出明亮的黄色荧光。在DPA-Cu/Ag NCs的制备条件达到最优化的情况下,可以将其作为探针,用来高选择性、高灵敏性地检测银离子。该探针检测银离子的检测限为0.3μmol/L,线性范围为0~500μmol/L。该DPA-Cu/Ag NCs探针还可应用于自然环境水样(湖水、瓶装矿泉水和实验室自来水)中银离子浓度的检测,其检测性能十分优异且具有良好的准确度和重现性,表明DPA-Cu/Ag NCs探针在环境检测方面有非常高的应用价值。

Bimetallic copper-silver nanoclusters(DPA-Cu/Ag NCs)were prepared by one-pot method using penicillamine as reducing agent and stabilizer,and used as a sensor to detect silver ions in water samples.The Ag+sensor has the advantages of low price,quick analysis speed and high selectivity.The structure and chemical composition of bimetallic copper-silver nanoclusters were characterized by transmission electron microscopy(TEM).The results showed that the DPA-Cu/Ag NCs exhibited a maximum emission at 555 nm with an excitation wavelength of 300 nm.It is a milky white solution under visible light,and the solution shows bright yellow fluorescence under UV light.When the preparation conditions of DPA-Cu/Ag NCs are optimized,it can be used as a probe to detect silver ions with high selectivity and sensitivity.The detection limit of silver ion is 0.3μmol/L and the linear range is 0-500μmol/L.The DPA-Cu/Ag NCs probe can also be applied to the detection of silver ion concentration in natural environmental water samples(lake water,bottled mineral water and laboratory tap water,etc.),and its detection performance is excellent with good percent of accuracy and reproducibility,indicating that the DPA-Cu/Ag NCs probe has extremely high application value in environmental monitoring.