The polyethyleneimine-capped copper nanoclusters (PEI-Cu NCs) were prepared by using polyethyleneimine as protective agent and hydrazine hydrate as reducing agent. The PEI-Cu NCs possessed strong fluorescence intensity, excellent water solubility, good stability and high dispersion. The sample’s fluorescence could be selectively quenched by the addition of fluazinam. There was a good linear relationship between the relative fluorescence intensity of PEI-Cu NCs and concentrations of fluazinam in the range of 0.5-70 μM. The quenching mechanism might be dynamic quenching and inner filter effect (IFE). Significantly, the PEI-Cu NCs could be used to detect fluazinam as fluorescent probe in environmental water samples.

以聚乙烯亚胺为保护剂，水合肼为还原剂，制备了聚乙烯亚胺封端的铜纳米簇（PEI-Cu NCs）。PEI-Cu NCs具有较强的荧光强度，优异的水溶性，良好的稳定性和高分散性。样品的荧光可以通过添加氟喹南来有选择地淬灭。PEI-Cu NCs的相对荧光强度与氟喹那南的浓度在0.5-70μM之间存在良好的线性关系。淬灭机理可能是动态淬灭和内部过滤效应（IFE）。值得注意的是，PEI-Cu NCs可用于检测氟济南作为环境水样品中的荧光探针。