Characterization of CdSe nanocrystals coated with amphiphiles. A capillary electrophoresis study |
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Authors: | S?awomir Oszwa?dowski Katarzyna Zawistowska-Gibu?a Kenneth P Roberts |
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Institution: | 1. Faculty of Chemistry, Department of Analytical Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664, Warsaw, Poland 2. Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, OK, 74104, USA
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Abstract: | We have synthesized CdSe nanocrystals (NCs) possessing a trioctylphosphine surface passivation layer and modified with amphiphilic molecules to form a surface bilayer. The NCs covered with single amphiphiles are not stable in aqueous solution, but a mixed amphiphilic system is shown to provide stability in solution over several months. The solutions of the modified NCs were characterized by UV-Vis absorbance, photoluminescence, and transmission electron microscopy. An electrophoretic study revealed two operational modes. The first relies on the enrichment of NCs using a micellar plug as a tool. The accumulation of NCs at the plug-electrolyte buffer interface results in a sharp peak. By controlling the electrophoretic conditions, nanocrystals were forced to exit a micellar plug into an electrolyte buffer. We conclude that a system consisting of modified nanocrystals and a micellar plug can act as a mixed pseudomicellar system, where modified nanocrystals play the role of pseudomicelles.FigureElectrophoretic focusing of amphiphile coated CdSe nanocrystals using a micellar plug. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00604-011-0727-8) contains supplementary material, which is available to authorized users. |
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