| Summary: | 碩士 === 國立臺東大學 === 應用科學系 === 105 === In the previous literature, the metal nanoclusters are usually synthesized by a single ligand making the properties and applications of the nanomaterial limited by the nature of the ligand. In this study, we upgraded the synthetic strategy and developed the bi-ligand copper nanoclusters (Cu NC). We discussed their fluorescence properties, and finally applied them to the detection of hexavalent chromium (Cr(VI)) in water. The bi-ligand Cu NC were synthesized from Cu2+ ions, thiosalicylic acid (TA) and cysteamine (CysA) through a simple one-pot method. The bi-ligand Cu NC not only have high quantum yield (> 18.9 %) and good photostability but also can been adjusted their fluorescence intensities and surface properties by changing the ratio of the two ligands. These advantages allow the bi-ligand Cu NC has a strong potential in the development of fluorescent probes. The fluorescent of the bi-ligand Cu NC can be quenched by Cr(VI) through an inner filter effect (IFE). The bi-ligand Cu NC can be applied to the detection of Cr(VI) with a wide linear range of 0.1 – 1000 μM and a low detection limit (LOD, signal-to-noise ratio = 3) of 0.03 μM is less than the guideline limit of the WHO, EU and TW (0.96 μM). Compared with other metal ions in the environment, the bi-ligand Cu NC have good selectivity for Cr(VI) that make it can been applied to the determination of Cr(VI) in mineral water samples. The recoveries were between 98.3 to 105.0 % and the relative standard deviations (RSD) were below 4.54% for three replicate measurements, suggesting the good repeatability of this method.
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