A new type of polyethyleneimine-protected copper nanoclusters (PEI-CuNCs) is favorably developed by a one-pot method under mild conditions. The obtained PEI-CuNCs is characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, Fourier-transform infrared (FTIR) spectroscopy and other techniques. It is worth noting that the proposed PEI-CuNCs demonstrate a selective response to chromium(VI) over other competitive species. Fluorescence quenching of PEI-CuNCs is determined to be chromium(VI) concentrations dependence with a low limit of detection of 8.9 nM. What is more, the as-developed PEI-CuNCs is further employed in building a detection platform for portable recognition of chromium(VI) in real samples with good accuracy. These findings may offer a distinctive strategy for the development of methods for analyzing and monitoring chromium(VI) and expand their application in real sample monitoring.

中文翻译：

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基于聚乙烯亚胺保护的铜纳米簇的荧光传感平台用于检测实际样品中的铬（VI）

在温和条件下通过一锅法顺利开发出一种新型聚乙烯亚胺保护的铜纳米簇（PEI-CuNCs）。通过X射线衍射、X射线光电子能谱、透射电子显微镜、傅里叶变换红外(FTIR)光谱等技术对所得PEI-CuNCs进行了表征。值得注意的是，与其他竞争物种相比，所提出的 PEI-CuNC 表现出对六价铬的选择性响应。PEI-CuNC 的荧光猝灭被确定为铬 (VI) 浓度依赖性，检测下限为 8.9 nM。更重要的是，所开发的PEI-CuNCs还进一步用于构建便携式识别实际样品中六价铬的检测平台，具有良好的准确度。这些发现可能为分析和监测六价铬的方法的开发提供独特的策略，并扩大其在实际样品监测中的应用。