Lin Yu-Syuan, Chiu Tai-Chia, Hu Cho-Chun
Department of Applied Science, National Taitung University 369, Sec. 2, University Rd. Taitung Taiwan Republic of China
RSC Adv. 2019 Mar 21;9(16):9228-9234. doi: 10.1039/c9ra00916g. eCollection 2019 Mar 15.
Generally, metal nanoclusters are synthesized using only a single ligand. Thus, the properties and applications of these nanomaterials are limited by the nature of the ligand used. In this study, we have developed a new synthetic strategy to prepare bi-ligand copper nanoclusters (Cu NCs). These bi-ligand Cu NCs are synthesized from copper ions, thiosalicylic acid, and cysteamine by a simple one-pot method, and they exhibit high quantum yields (>18.9%) and good photostability. Most interestingly, the fluorescence intensities and surface properties of the Cu NCs can be tailored by changing the ratio of the two ligands. Consequently, the bi-ligand Cu NCs show great promise as fluorescent probes. Accordingly, the Cu NCs were applied to the inner-filter-effect-based detection of hexavalent chromium in water. A wide linear range of 0.1-1000 μM and a low detection limit (signal-to-noise ratio = 3) of 0.03 μM was obtained. The recoveries for the real sample analysis were between 98.3 and 105.0% and the relative standard deviations were below 4.54%, demonstrating the repeatability and practical utility of this assay.
一般来说，金属纳米团簇仅使用单一配体进行合成。因此，这些纳米材料的性质和应用受到所用配体性质的限制。在本研究中，我们开发了一种新的合成策略来制备双配体铜纳米团簇（Cu NCs）。这些双配体Cu NCs通过简单的一锅法由铜离子、硫代水杨酸和半胱胺合成，并且它们表现出高量子产率（>18.9%）和良好的光稳定性。最有趣的是，Cu NCs的荧光强度和表面性质可以通过改变两种配体的比例来调节。因此，双配体Cu NCs作为荧光探针具有很大的潜力。相应地，Cu NCs被应用于基于内滤效应的水中六价铬检测。获得了0.1 - 1000 μM的宽线性范围和0.03 μM的低检测限（信噪比 = 3）。实际样品分析的回收率在98.3%至105.0%之间，相对标准偏差低于4.54%，证明了该测定方法的可重复性和实用性。
