合成了金纳米团簇（GSH-AuNCs）和碳量子点（CDs）2种荧光纳米材料，分别对其进行光学、形貌表征。进一步构建金纳米团簇/碳量子点比率型荧光探针，根据Pb²⁺对CDs/AuNCs荧光探针的高选择性荧光增强作用，将CDs作为参比探针，GSH-AuNCs作为响应探针，利用GSH-AuNCs（580 nm）与CDs（450 nm）的荧光强度比值（F=F₅₈₀/F₄₅₀）的变化情况来高灵敏度的检测Pb²⁺含量。在浓度为20~700 nmol/L围内，CDs/AuNCs荧光探针检测Pb²⁺的线性方程为F₅₈₀/F₄₅₀=0.008 97[Pb（Ⅱ）]+2.727 7（R²=0.994 6），LOD=3.9 nmol/L，并对该比率型荧光探针的构建和检测机制进行了探究。最后将该探针应用于实际水样中Pb²⁺的检测，加标回收率在90.7%~117.1%，说明该探针具有潜在的应用价值。

Gold nanoclusters (GSH-AuNCs) and carbon quantum dots (CDs) are synthesized,and their optical and morphology characterizations are performed.Furthermore,CDs/AuNCs ratio fluorescent probe is constructed to detect Pb²⁺ with high selectivity.According to the high selective fluorescence enhancement effect of Pb²⁺ on CDs/AuNCs fluorescent probe,CDs are used as reference probe and GSH-AuNCs as response probe.Changes of fluorescence intensity ratio (F=F₅₈₀/F₄₅₀) between GSH-AuNCs (580 nm) and CDs (450 nm) are utilized to detect Pb²⁺ content with high sensitivity.In the concentration range of 20 to 700 nmol·L^-1,the linear equation for the detection of Pb²⁺ by CDs/AuNCs fluorescence probe is F₅₈₀/F₄₅₀=0.008 97 [Pb(Ⅱ)]+2.727 7 (R²=0.994 6) and the low detection limit is 3.9 nmol·L^-1.The construction mechanism of this ratio fluorescent probe and its sensing mechanism for the detection of Pb²⁺ are explored.Recovery rate is between 90.7% and 117.1% when this probe is applied to detecting Pb²⁺ in actual water samples,indicating that this fluorescent probe has a very good application value in the detection of lead ions.

雷霞(1995-),女,硕士生