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

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

Abstract

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

CLC Number:

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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