亮蓝与石墨烯/CdTe量子点复合物相互作用的荧光光谱性能研究

The Fluorescence Spectrum Properties of Interaction between Brilliant Blue with Graphene/CdTe Quantum Dots Composites

成功合成了石墨烯/CdTe量子点复合物,并基于亮蓝对石墨烯/CdTe量子点复合物的较强的荧光猝灭作用,研究了亮蓝与石墨烯/CdTe量子点复合物相互作用的光谱性能.研究发现,亮蓝的紫外吸收光谱和石墨烯/CdTe量子点复合物的荧光发射光谱相互重叠,亮蓝荧光发射强度的增加和石墨烯/CdTe量子点复合物荧光发射强度的降低,推断两者之间发生了荧光共振能量转移.此外,石墨烯/CdTe量子点复合物荧光强度的降低(F_0/F)与亮蓝的浓度之间具有良好的线性关系,线性范围为12.62～94.65 nmol·L^(-1),最低检出限为6.4 nmol·L^(-1),可用于溶液中亮蓝的定量分析,为建立新型荧光传感器提供了理论和实验基础.

In this paper,graphene/CdTe quantum dots composites had been successfully synthesized,the spectral properties of the interaction between Brilliant blue and graphene/CdTe quantum dot complexes were investigated based on the strong fluorescence quenching effect of Brilliant Blue on graphene/CdTe quantum dots composites.Results shown that the UV absorption spectra of Brilliant Blue overlapped with the fluorescence emission spectrum of graphene/CdTe quantum dot composites,and increasing of fluorescence emission intensity of Brilliant Blue and the decreasing of the fluorescence emission intensity of graphene/CdTe quantum dot complex,all these indicated that fluorescence resonance energy transfer between Brilliant Blue and graphene/CdTe quantum dot has been taken place.Also there is a good linear relationship between the decreasing of fluorescence intensity of graphene/CdTe quantum dots composites(F0/F)and the concentrations of Brilliant Blue,the linear range is 18.93~94.65 nmol·L^-1,the detection limit is 6.6nmol·L^-1,which could be used to quantitative analysis of Brilliant Blue solution,and could provide a theoretical and experimental basis for new fluorescence sensors.