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Synthesis, Characterization and Interaction of Water-soluble CdSe/CdS Nanocrystals with Bovine Serum Albumin

Author: LinChengFang
Tutor: HuangFengHua
School: Fujian Normal University
Course: Inorganic Chemistry
Keywords: core-shell CdSe/CdS/Cys cysteine nanocrystals BSA
CLC: R318.08
Type: Master's thesis
Year: 2007
Downloads: 138
Quote: 2
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Abstract


With the improvement of synthesis of semiconductor nanocrystals (quantum dots, QDs), QDs appear many advantages as labels, compared with existing organic dyes. This has led to practicability of the new nanotechnology. For this reason, the development of a successful synthesis of nanocrystals with high fluorescent quantum yield is very important.The main content in this thesis:l、CdSe and CdSe nanocrystals capped by CdS were synthesized in the aqueous solution at room temperature using cysteine (L-Cys) as stabilizer. X-ray powder diffraction and transmission electron microscopy were used to analyze the core/shell nanocrystals structure and determine their average size, size distribution and shape. Uv-vis spectrum and Fluorescence (PL)were used to analyze the optic properties of CdSe and CdSe/CdS nanocrystals.FT-IR was used to analyze cysteine and CdSe/CdS stabilized by cysteine. The results indicated that the CdSe/CdS nanocrystals were coated by the cysteine, which made nanocrystals water-soluble and biocompatible. The luminescence intensity of core/sheU CdSe/CdS/Cys nanocrystals were enhanced when compared with the uncoated CdSe/Cys nanocrystals. Using L-tryptophan as a standard, for which a fluorescent quantum yield of 0.14 has been reported, the quantum yield of CdSe/CdS/Cys nanocrystals was measured to be 0.40.2、The effects of refluxed time, pH, quantity of shell, molar ratios of core to shell, temperature of water-bath and the quantity of Cysteine on the spectral characterization of CdSe/CdS/Cys were studied. The optimized conditions for preparing CdSe/CdS/Cys were obtained.3、The changes of fluorescence spectra and absorption spectra of nanocrystals before and after labeling with BSA were investigated, and found that the fluorescence spectra of the nanocrystals after coupling with BSA were enhanced markedly.

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