Capillary electrophoretic separation and characterizations of CdSe quantum dots

• Authors: Sławomir Oszwałdowski , Katarzyna Zawistowska , Laura Grigsby , Kenneth Roberts
• Languages of publication: EN

Abstracts

EN

We have developed a capillary electrophoresis method to characterize the QD surface ligand interactions with various surfactant systems. The method was demonstrated with 2–5 nm CdSe nanoparticles surface-passivated with trioctylphosphine oxide (TOPO). Water solubility was accomplished by surfactant-assisted phase transfer via an oil-in-water microemulsion using either cationic, anionic, or non-ionic surfactants. Interaction between the QD surface ligand (TOPO) and the alkyl chain of the surfactant molecule produces a complex and dynamic surface coating that can be characterized through manipulation of CE separation buffer composition and capillary surface modification. Additional characterization of the QD surface ligand interactions with surfactants was accomplished by UV-VIS spectroscopy, photoluminescence, and TEM. It is anticipated that studies such as these will elucidate the dynamics of QD surface ligand modifications for use in sensors. [...]

Keywords

EN

Nanoparticles; Size separation; Dynamic coating; Capillary electrophoresis; Surfactant coated CdSe nanoparticles

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2010
• Volume: 8
• Issue: 4
• Pages: 806-819

Dates

published

1 - 8 - 2010

online

17 - 6 - 2010

Contributors

author

Sławomir Oszwałdowski

• Faculty of Chemistry, Department of Analytical Chemistry, Warsaw University of Technology, 00-664, Warsaw, Poland

author

Katarzyna Zawistowska

• Faculty of Chemistry, Department of Analytical Chemistry, Warsaw University of Technology, 00-664, Warsaw, Poland

author

Laura Grigsby

• Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, OK, 74104, USA

author

Kenneth Roberts

• Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, OK, 74104, USA

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Identifiers

DOI

10.2478/s11532-010-0052-9