Characterization of CdSe quantum dots with bidentate ligands by capillary electrophoresis

• Authors: Sławomir Oszwałdowski , Katarzyna Zawistowska-Gibuła , Kenneth Roberts
• Languages of publication: EN

Abstracts

EN

The CdSe quantum dots (QDs) with bidentate ligands: a-diimine (NN) and dihydrolipoic acid (DHLA) were synthesized and characterized by UV-Vis, particle size and capillary electrophoretic techniques. Two systems were analyzed: CdSe with one ligand (CdSe/ligand) and CdSe with two different ligands (CdSe//ligand1/ligand2), where ligand = α-diimine or DHLA. Hydrodynamic features of functionalized QDs were characterized by zone capillary electrophoretic (CZE), and particle size techniques and these methods were consistent. It was established that CZE, micellar (MEKC) and microemulsion (MEEKC) modes were suitable for separating charged CdSe QDs and that no peaks were obtained for QDs passivated with electrically neutral ligands. For CdSe QDs with neutral (NN) ligands, a preconcentration method with the use of a micellar plug was introduced for visualizing these QDs. A sharp peak representing neutral QDs was obtained within the zone of micellar plug of a non-ionic surfactant, Here, a ligand character used for CdSe modification and the type of the electrophoretic method applied were the determining factors for the QDs peak visualization. Moreover, examples of visualization of charged and neutral QDs on the same run were presented, and for this purpose, dual mechanism (separation/preconcentration) was proposed. [...]

Keywords

EN

Nanocrystals CdSe; Capillary electrophoresis; Ligand exchange; Dihydrolipoic acid; Surfactants

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 4
• Pages: 572-584

Dates

published

1 - 8 - 2011

online

4 - 6 - 2011

Contributors

author

Sławomir Oszwałdowski

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

author

Katarzyna Zawistowska-Gibuła

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

author

Kenneth Roberts

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

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Identifiers

DOI

10.2478/s11532-011-0037-3