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A Study of the Resonance Raleigh Scattering Spectra, Fluorescence, UV-absorption of the Adsortption of Dyes on the Mono-6-thio-β-cyclodextrin Capped CdTe Qudantum Dots

Author: WangLei
Tutor: HeYouQiu
School: Southwestern University
Course: Physical and chemical
Keywords: Resonance Rayleigh Scattering Spectra Fluorescence spectroscopy UV - visible absorption spectrum CdTe quantum dots
CLC: O647.3
Type: Master's thesis
Year: 2010
Downloads: 160
Quote: 1
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Abstract


In recent years, due to its special optical and electrical properties of the quantum dots caused widespread concern. Modified of photoactive dye molecule on the surface of the quantum dot can enhance the photophysical properties of quantum dots, making this hybrid nanomaterials in solar energy conversion, optical devices, biological monitoring and imaging has shown great application prospects. Such hybrid construction of nanomaterials, at the molecular level interaction between the dye molecules and quantum dots and the surface of the quantum dot adsorption morphology. Currently, however, research in this area is also very small. This article by fluorescence spectroscopy, UV - visible absorption spectroscopy, resonance Rayleigh scattering (RRS) spectroscopy combined with transmission electron microscopy, and quantum chemistry calculation method to research from the molecular level neutral red, methylene blue / methylene green, malachite green / crystallization The purple the three categories dye molecules in single - (6 - mercaptopurine)-β-cyclodextrin-coated CdTe quantum dot surface adsorption behavior, and to explore the mechanism of the reaction, the reaction model. Based on a single - (6 - mercaptopurine)-β-cyclodextrin-coated CdTe quantum dot fluorescent reversible regulation. The main system is as follows: single - (6 - mercapto)-β-cyclodextrin inclusion the CdTe QDs its interaction studies with neutral red thioglycolic acid (TGA) and single - (6 - mercapto)-β-cyclodextrin (mono-6-thio-β-CD) in a mixed stabilizer by optimization TGA/mono-6-thio-β-CD ratio and reflux time, synthesized a uniform particle size distribution, a fluorescent CdTe quantum dots (QDs), quantum yields of up to 81.3% of the mono-6-thio-β-CD package is to establish a new method of aqueous phase synthesis of β-CD-coated CdTe QDs. By fluorescence spectroscopy, UV - visible absorption spectroscopy, resonance Rayleigh scattering (RRS) spectra of mono-6-thio-β-CD-CdTe QDs neutral red interaction. By comparing the TGA-CdTe QDs and mono-6-thio-β-CD-CdTe QDs and neutral red interactions, combined with transmission electron microscopy (TEM) discussed the reaction mechanism and the reaction model. BR buffer solution of pH 6.1 in which sexual red concentration of 7.5 × 10-6mol / L, neutral red-ionic body HNR and molecular body NR mono-6-thio-β-CD-CdTe of QDs the the surface-SCH2COO-and mono-6-thio-of β-CD combination reached saturation among sex red concentration greater than 7.5 × 10-6 mol / L, the neutral red mono-6-thio-β-CD- CdTe QDs surface aggregation, resulting in mono-6-thio-β-CD-CdTe QDs particle diameter increases, fluorescence quenching sharp, RRS significantly enhanced. Interaction 2. Single - (6 - mercaptopurine)-β-cyclodextrin inclusion CdTe quantum dots with methylene blue and methylene green fluorescence Feng.Reversible thioglycolic acid (TGA) and single - (6 - mercaptopurine )-β-cyclodextrin (mono-6-thio-β-CD) as a mixed stabilizer synthesis of mono-6-thio-β-CD package of CdTe quantum dots (QDs). By fluorescence spectroscopy, UV - visible absorption spectroscopy, resonance Rayleigh scattering (RRS) spectra of the mono-6-thio-β-CD-CdTe QDs with methylene blue (MB) / methylene green (MG) interactions. Interactions by comparing TGA-CdTe QDs and mono-6-thio-of β-the CD-CdTe QDs with the MB / MG, combined with transmission electron microscopy (TEM) discussed the reaction mechanism and the reaction model. In pH 7.0 phosphate buffer solution, MB / MG the molecular monomers with mono-6-thio-β-CD-CdTe QDs binding, resulting in mono-6-thio-β-CD-CdTe QDs conduction band excitation states The transfer of electrons to the ground state MB / MG, so that the fluorescence quenching of mono-6-thio-β-CD-CdTe QDs. MB primarily with the combination of β-CD of the surface of the mono-6-thio-β-CD-CdTe QDs, and MG is mainly mono-6-thio-β-CD-CdTe QDs surface-SCH2COO-binding. Was added to the reaction system hsDNA, hsDNA, MB / MG detached from the surface of the mono-6-thio-β-CD-CdTeQDs, resulting in mono-6-thio-β-CD-CdTe QDs excited electrons to the transfer process of the MB / MG suppressed, mono-6-thio-β-CD-CdTe QDs fluorescence recovery. The the fluorescence Feng.Reversible of mono-6-thio-β-CD-CdTe QDs. The thiol 3. Single - (6 - mercaptopurine)-β-cyclodextrin inclusion CdTe quantum dots with malachite green and crystal violet interaction thioglycolic acid (TGA) and single - (6 -)-β-ring a mixed stabilizer dextrin (mono-6-thio-β-CD), synthesis of mono-6-thio-β-CD package of CdTe quantum dots (QDs), fluorescence spectroscopy, UV - visible absorption spectrum, resonance Rayleigh scattering (RRS) spectra of the mono-6-thio-β-CD-CdTe QDs malachite green (MG) / crystal violet (CV) of the interaction. By the comparative TGA-CdTe QDs and mono-6-thio-of β-the CD-CdTe QDs with the interaction of MG / CV, and transmission electron microscopy (TEM) discussed the reaction mechanism and the reaction model. PH 7.4 phosphate buffer solution, the CV / mg the molecular monomers with mono-6-thio-β-CD-CdTe QDs binding, resulting in mono-6-thio-β-CD-CdTe QDs conduction band excited state The transfer of electrons to the ground state MB / MG, so that the fluorescence quenching of mono-6-thio-β-CD-CdTe QDs. The MG and mono-6-thio-β-CD-CdTe QDs combination of unlike CV, MG mono-6-thio-β-CD-CdTe QDs fluorescence quenching constant is much larger than the CV, and mono-6-thio -β-the CD-CdTe-MG system of RRS was significantly enhanced, and the mono-6-thio-β-CD-CdTe-CV system of RRS without significantly with changes to achieve a mono-6-thio-β-CD-CdTe QDs RRS identification of the selectivity of the probe MG.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Adsorption
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