Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/47553
Title: TOWARDS THE PREPARATION OF HIGHLY LUMINESCENT WATER-SOLUBLE QUANTUM DOTS
Authors: DAI MENGQIAO
Keywords: Quantum dot, surface ligand, synthesis, surface engineering, DNA conjugation
Issue Date: 10-Apr-2013
Source: DAI MENGQIAO (2013-04-10). TOWARDS THE PREPARATION OF HIGHLY LUMINESCENT WATER-SOLUBLE QUANTUM DOTS. ScholarBank@NUS Repository.
Abstract: Quantum dots (QDs) are the semiconductor crystals of three dimensions in nanometer scale exhibiting quantum confinement effect. The size-dependent optical properties trigger numerous applications based on QDs. In biological research, highly luminescent water-soluble QDs are inevitably required. The investigations described in this study bridge the gap between the as-synthesized QDs in the organic phase and the ones ready for biological application. Firstly, an aqueous synthetic route of CdTe/CdS core/shell QDs under ambient air atmosphere without inert gas protection throughout the entire fabrication process was developed. The obtained QDs were highly luminescent with a widely tunable photoluminescence emission window of 535-815 nm. Secondly, a facile and general method was devised to transfer oleophilic QDs to aqueous media with high transfer efficiency (~100%) and essentially retained PLQY (> 80%). The transfer is based on ligand exchange mediated by ethylenediamine. This method was further employed to assemble DNA strands on QDs.
URI: http://scholarbank.nus.edu.sg/handle/10635/47553
Appears in Collections:Ph.D Theses (Open)

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