金属离子对二巯基辛酸修饰CdSe/ZnS量子点荧光的无规则影响
Ruleless Effect of Metal Ions on the Fluorescence of Dihydrolipoic Acid Capped CdSe/ZnS Quantum Dots
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摘要: 以二巯基辛酸为修饰试剂制备了水溶性CdSe/ZnS量子点.报道了Pb~(2+),Cu~(2+),Cd~(2+)和Ag~+对DHLA-QDs荧光的无规则影响.初步探讨了金属离子对二巯基辛酸修饰的CdSe/ZnS量子点荧光强度无规则影响的机理,推测量子点能否用作金属离子探针与其表面修饰基团密切相关.
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关键词:
- 量子点,金属离子,荧光探针,修饰基团
Abstract: Water-soluble dihydrolipoic acid capped CdSe/ZnS quantum dots (DHLA-QDs) were prepared by a slight modification of the procedure of precursors. DHLA-QDs are widely used in biological labeling for Water-soluble and biocompatible. Herein, we reported that Pb~(2+) , Cu~(2+) , Cd~(2+) and Ag~+ had great effects on the fluorescence of the DHLA-QDs, but these effects were ruleless. It was speculated that the modified ligands on the surface of QDs played an important role in whether water-soluble QDs were suitable to detect metal ions as fluorescence probes.The possible reason was discussed. -
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