麦芽糖在CdS量子点表面吸附的荧光光谱  

Adsorption of maltose on the Cd S QDs surface by the fluorescence spectrum

作　　者：杜保安[1] 王晓薇[1] 王妍[1] 高亚超[1] 

机构地区：[1]河北大学化学与环境科学学院药物化学与分子诊断教育部重点实验室,河北保定071002

出　　处：《河北大学学报（自然科学版）》2016年第1期52-57,共6页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(21075027);教育部科学技术研究重点项目(211014);国家自然科学青年基金资助项目(21405032)

摘　　要：用巯基丙酸作稳定剂,合成了水溶性好、单分散的Cd S量子点,利用麦芽糖对Cd S量子点的荧光猝灭效应,研究了麦芽糖在Cd S量子点表面的吸附行为.结果表明:量子点的荧光猝灭效应受到p H值和量子点浓度的显著影响,并且与吸附在量子点表面的麦芽糖分子数有关,麦芽糖分子在Cd S量子点表面吸附符合Langmuir等温吸附方程.c/ΔF与浓度c成很好的直线关系,浓度的变化范围达到3个数量级.根据Langmuir等温吸附方程式,在较低的浓度范围内,ΔF与浓度c也成很好的直线关系,利用这种直线关系可以建立麦芽糖的定量分析方法,检出限达到nmol级.Mercaptopropionic acid（MPA） was used as the stabilizer,the mono-dispersed CdS quantum dots （QDs）were synthesized in water. The fluorescence of the CdS QDs could be effectively quenched by the maltose molecules, and the quenching effect was used to study the absorption behavior of the maltose on the QDs＇ surface. The result showed that the quenching effect was strongly influenced by the pH value and the QDs concentration,and involved the number of the maltose molecules absorbed on the QDs＇ surface. The absorption behavior of the maltose molecules was consistent with the Langmuir isotherm equation,the relationship between the c/△F and c was linearity, the concentration of the maltose was ranged between 10-6 and 10-3 mol/L. According to the Langmuir isotherm equation, the relationship of the AF and c was also linearity at the low maltose concentration, and it was possible to determining the maltose concentration by using the line as the standard line,the detect limit was as low as nmol. The interference of some corn-pounds was also studied.

关 键 词：麦芽糖 CDS量子点 荧光光谱 Langmuir等温吸附 

分 类 号：O65[理学—分析化学]