Journal
ANALYTICA CHIMICA ACTA
Volume 647, Issue 2, Pages 219-225Publisher
ELSEVIER
DOI: 10.1016/j.aca.2009.06.004
Keywords
Capillary electrophoresis; Polymeric additive; Quantum dots; Sieving medium; Size determination; Size separation
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Funding
- National Natural Science Foundation of China [30670553]
- Foundation of Wuhan National Laboratory for Optoelectronics [P080017]
- Graduate Innovation Fund of Huazhong University of Science and Technology [HF05222007170]
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This paper describes a highly efficient method for size determination of water-soluble CdSe/ZnS core-shell quantum dots (QDs) by capillary electrophoresis (CE) using polymer additive as sieving medium. The influence of some factors, such as kinds and concentrations of the sieving medium, pH, concentrations of the background electrolyte (BGE) and applied voltage, on the separation of QDs was investigated. Under the optimal separation conditions, four different sized QDs were successfully separated, and the relative standard deviation (RSD) of the migration times for these QDs was below 1.013%. In addition, an equation was fit by taking into account the correlation existing between the electrophoretic mobilities and the sizes of a set of QDs. The feasibility of this equation to measure the sizes of other QDs was confirmed by comparison with the sizes obtained by transmission electron microscopy (TEM) experiment. This work offers a novel method for size determination of QDs, and provides an important reference on the study of QDs based on CE. (C) 2009 Elsevier B.V. All rights reserved.
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