Characterization of CdSe quantum dots with bidentate ligands by capillary electrophoresis

Sławomir Oszwałdowski , Katarzyna Zawistowska-Gibuła , Kenneth P. Roberts


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.
Author Sławomir Oszwałdowski KChA
Sławomir Oszwałdowski,,
- Chair Of Analytical Chemistry
, Katarzyna Zawistowska-Gibuła
Katarzyna Zawistowska-Gibuła,,
, Kenneth P. Roberts
Kenneth P. Roberts,,
Journal seriesCentral European Journal of Chemistry, ISSN 1895-1066, 1644-3624
Issue year2011
Keywords in EnglishBiochemistry, general, Biophysics and Biological Physics, Capillary electrophoresis, Chemistry/Food Science, general, Dihydrolipoic acid, Geochemistry, Ligand exchange, Nanocrystals CdSe, Surfactants
Score (nominal)0
Citation count*9 (2016-05-30)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.