Please use this identifier to cite or link to this item: https://doi.org/10.1088/0957-4484/20/42/425102
Title: Positively charged and pH self-buffering quantum dots for efficient cellular uptake by charge mediation and monitoring cell membrane permeability
Authors: Wang, S. 
Song, H. 
Ong, W.Y.
Han, M.Y.
Huang, D. 
Issue Date: 2009
Citation: Wang, S., Song, H., Ong, W.Y., Han, M.Y., Huang, D. (2009). Positively charged and pH self-buffering quantum dots for efficient cellular uptake by charge mediation and monitoring cell membrane permeability. Nanotechnology 20 (42) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0957-4484/20/42/425102
Abstract: Positively charged and pH self-buffering quantum dots (Tren-QDs) were achieved by surface functionalization with tris(2-aminoethyl)amine (Tren) derivatives, which are attached to the inorganic cores of QDs through bidentate chelating of dithiocarbamates. The Tren-QDs exhibit pH buffering capability by absorbing or releasing protons due to the surface polyamine groups as the surrounding pH fluctuates. Such self-buffering capability stabilizes the photoluminescence of the Tren-QDs against acid. The Tren-QDs bear positive charges through protonation of the surface polyamine groups under physiological conditions and the surface positive charges improve their cellular uptake efficiency by charge mediation, which has been demonstrated by BV-2 microglia cells. The photoluminescence of Tren-QDs shows a selective Stern-Volmer response to copper ions and this property has been preliminarily evaluated for investigating the BV-2 cell membrane structure by monitoring the photoluminescence of intracellular Tren-QDs. © 2009 IOP Publishing Ltd.
Source Title: Nanotechnology
URI: http://scholarbank.nus.edu.sg/handle/10635/94582
ISSN: 09574484
DOI: 10.1088/0957-4484/20/42/425102
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