麦芽糖在CdS量子点表面吸附的荧光光谱

doi:10.3969/j.issn.1000-1565.2016.01.009

河北大学学报(自然科学版) ›› 2016, Vol. 36 ›› Issue (1): 52-57.DOI: 10.3969/j.issn.1000-1565.2016.01.009

麦芽糖在CdS量子点表面吸附的荧光光谱

杜保安,王晓薇,王妍,高亚超

收稿日期:2015-08-20 出版日期:2016-01-25 发布日期:2016-01-25
作者简介:杜保安(1963—),男,河北安国人,河北大学教授,主要从事量子点合成与应用研究. E-mail:baoandu@sina.com
基金资助:
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)

Adsorption of maltose on the CdS QDs surface by the fluorescence spectrum

DU Baoan,WANG Xiaowei,WANG Yan,GAO Yachao

key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Mimistry of Education, College of Chemistry and Environment Science, Hebei University, Baoding 071002, China

Received:2015-08-20 Online:2016-01-25 Published:2016-01-25

摘要/Abstract

摘要： 用巯基丙酸作稳定剂,合成了水溶性好、单分散的CdS量子点,利用麦芽糖对CdS量子点的荧光猝灭效应,研究了麦芽糖在CdS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pH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CdS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.

关键词: 麦芽糖, CdS量子点, 荧光光谱, Langmuir等温吸附

Abstract: 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/ΔF 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 ΔF 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 compounds was also studied.

Key words: maltose, CdS quantum dots, fluorescence, Langmuir isotherm equation

中图分类号:

杜保安,王晓薇,王妍,高亚超. 麦芽糖在CdS量子点表面吸附的荧光光谱[J]. 河北大学学报(自然科学版), 2016, 36(1): 52-57.

DU Baoan,WANG Xiaowei,WANG Yan,GAO Yachao. Adsorption of maltose on the CdS QDs surface by the fluorescence spectrum[J]. Journal of Hebei University (Natural Science Edition), 2016, 36(1): 52-57.

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麦芽糖在CdS量子点表面吸附的荧光光谱

Adsorption of maltose on the CdS QDs surface by the fluorescence spectrum

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