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Preparation and Bioanalysis of Quantum Dots and Their Nanocomposites

Author: WangSheng
Tutor: ShiJianJun
School: Anhui University of Technology
Course: Applied Chemistry
Keywords: CdTe quantum dots sonoelectrochemistry graphene quantum dots photoluminescence cell imaging
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Type: Master's thesis
Year: 2013
Downloads: 21
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Abstract


This thesis mainly focuses on the synthesis of some fluorescent nanomaterials, including CdTe quantum dots (CdTe QDs), graphene quantum dots (GQDs), and some nanocomposites such as HBN-GQDs are prepared by using HBN as the templates. Techniques such as powder X-ray diffraction (XRD), photoluminescence spectra (PL), UV-Vis absorption spectroscopy (UV-vis), energy dispersive spectrometry (EDS), transmission electron micrographs (TEM), scanning electron micrographs (SEM) and high resolution transmission electron micrographs (HRTEM) were used to characterize the obtained products. The bioimaging applications of some materials were investigated. The main results can be summarized as follows:1. Sonoelectrochemical synthesis of water-soluble CdTe quantum dotsAiming at a facile and fast one-pot method has been developed to synthesize CdTe quantum dots (QDs) with PL emission of509nm to565nm in aqueous phase by sonoelectrochemical method without the protection of N2. The experiments demonstrated that the parameters of current intensity, current pulse width, reaction temperature and the photoluminescence (PL) could adjust the wavelengths of QDs. This method is expected to prepare other semiconductor QDs.2. Sonoelectrochemical fast synthesis of near-infrared-emitting CdTe quantum dots for fluorescent cell imagingAiming at the complex synthesis routes and low photoluminescence quantum yield (PL QY), a facile and fast method has been developed to synthesize CdTe quantum dots (QDs) precursor in aqueous phase by sonoelectrochemical method without the protection of N2; Then the CdTe QDs precursor obtained from different conditions were refluxed in oil bath to synthesis water-soluble, near-infrared-emitting CdTe QDs. The morphology, structure and composition of the as-prepared products were investigated by TEM and XRD. By controlling the current pulse width, reaction time and reaction temperature, the size and morphology controlled CdTe QDs precursor were obtained. By forward refluxing, CdTe QDs with different emission wavelengths were obtained. The CdTe QDs with emission of602nm was succeeded using in Hela cell imaging.3. Fabrication of graphene quantum dots and hexagonal boron nitride nanocomposites for fluorescent cell imaging Graphene quantum dots (GQDs) with green fluorescence were incorporated onto hexagonal boron nitride sheets (HBN) through electrostatic interaction by using poly (diallyldimethylammonium)(PDDA) as a bridge to fabricate the novel nanocomposites (HBN-GQDs). The HBN-GQDs nanocomposites exhibited strong green fluorescent property, high stability, water solubility, very low cytotoxicity on Hela cells. These properties make the HBN-GQDs nanocomposites as good candidate materials for biological applications. The results for the imaging of live cells indicated that the cell-penetrating HBN-GQDs could be promising nanoprobes for intracellular imaging and therapeutic applications.

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