纳米金对碳点荧光猝灭的研究

实验发现纳米金(AuNPs)能有效地猝灭碳点(CDs)的荧光.考察了CDs质量浓度、pH值、反应温度和时间等多种因素对荧光猝灭的影响,在最佳实验条件下猝灭常数为9.1×108 L/mol.此外,加入猝灭剂AuNPs前后CDs的荧光寿命基本不变;且随温度升高,猝灭常数减小.因此,推测AuNPs对CDs的荧光猝灭为静态猝灭.

A Study of Fluorescence Quenching of Carbon Dots by Gold Nanoparticles

We found in this study that gold nanoparticles (AuNPs) could effectively quench the fluorescence of car-bon dots (CDs) .The effects of CDs concentration ,pH ,temperature and inacbating time on fluorescence quenching were investigated .Under the optimal conditions a quenching constant of 9.1 × 108 L/mol was a-chieved .It is worth noting that with increasing inacbating temperature ,the quenching constant decreased . On the other hand ,the fluorescence lifetime of CDs hardly changed in the presence of AuNPs .Therefore , we speculated that the fluorescence quenching of CDs by AuNPs was static quenching .