期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 75, 期 5, 页码 1571-1576出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2010.02.021
关键词
CdTe QDs; Nile blue; UV-vis absorption spectroscopy; Resonance Rayleigh scattering; Fluorescence quenching; Binding molar ratio
类别
资金
- National Natural Science Foundation of China [20875078]
- Chongqing Municipal Key Laboratory on Luminescence and Real-Time Analysis, Southwest University (CSTC) [2006CA8006]
Thioglycolic acid (TGA) capped CdTe quantum dots (QDs) with the diameter of 2-3 nm were synthesized. The interaction between CdTe QDs and Nile blue (NB) was investigated by ultraviolet-visible (UV-vis) absorption, resonance Rayleigh scattering (RRS) and fluorescence spectroscopy. UV-vis absorption spectrum of CdTe QDs and NB obviously changed, showing that CdTe QDs could associate with NB to form a new complex. At pH 6.8, NB effectively quenched the fluorescence of CdTe QDs. It was proved that the fluorescence quenching of CdTe QDs by NB was mainly result of the formation of CdTe QDs-NB complex, electrostatic attraction and hydrophobic forces played a major role in stabilizing the complex. The binding molar ratio of CdTe QDs and NB was 5:1 by a mole-ratio method. The interaction between CdTe QDs and NB lead to the remarkable enhancement of RRS and the enchantments were in proportional to the concentration of NB in a certain range. The mechanism of the interaction between CdTe QDs and NB, reasons for the enhancement of RRS intensity were also discussed. The obtained results suggested the more satisfactory mechanism for the interaction between CdTe QDs and NB. (C) 2010 Elsevier B.V. All rights reserved.
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