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Metal ion (silver, cadmium and zinc ions) modified CdS quantum dots for ultrasensitive copper ion sensing

机译:金属离子(银,镉和锌离子)修饰的CdS量子点,用于超灵敏的铜离子感测

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Metal ion (Ag~+, Cd~+, Zn~(2+)) modified CdS quantum dots (QDs) were synthesized and used for Cu~(2+) sensing. Modification by these metal ions could enhance the PL intensity of CdS QDs with the extent of the PL enhancement being related to the concentration of the metal ions. Different metal ion (Ag~+, Cd~(2+), Zn~(2+)) modified CdS QDs also showed different analytical characteristics for Cu ~(2+) sensing. In particular, Ag+ modified CdS QDs showed greatly enhanced sensitivity for Cu~(2+) determination than did the unmodified CdS QDs. A limit of detection (LOD) of 2.0 × 10~(-10) M was obtained for Ag~+ modified CdS QDs, which is the lowest LOD obtained using QDs as fluorescence probes for Cu~(2+) sensing. This study demonstrates the important role of surface state of QDs in fluorescence sensing.
机译:合成了金属离子(Ag〜+,Cd〜+,Zn〜(2+))修饰的CdS量子点(QDs)并将其用于Cu〜(2+)传感。这些金属离子的修饰可以增强CdS QD的PL强度,而PL增强的程度与金属离子的浓度有关。不同的金属离子(Ag〜+,Cd〜(2 +),Zn〜(2+))修饰的CdS量子点对Cu〜(2+)的传感​​也表现出不同的分析特性。尤其是,Ag +修饰的CdS QD与未修饰的CdS QDs相比,对Cu〜(2+)测定的灵敏度大大提高。对于Ag〜+修饰的CdS QD,检测限(LOD)为2.0×10〜(-10)M,这是使用QD作为Cu〜(2+)传感的荧光探针获得的最低LOD。这项研究证明了量子点表面状态在荧光传感中的重要作用。

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