Title: Isotachophoretic measurements of luminescent semiconductor nanocrystals

Authors: Wendelin Bucking, Jurgen Riegler, Christian Rettenmaier, Thomas Nann

Addresses: Freiburg Materials Research Center (FMF), Albert-Ludwig University Freiburg, Stefan-Meier-Strasse 21, D–79104 Freiburg, Germany. ' Freiburg Materials Research Center (FMF), Albert-Ludwig University Freiburg, Stefan-Meier-Strasse 21, D–79104 Freiburg, Germany. ' Freiburg Materials Research Center (FMF), Albert-Ludwig University Freiburg, Stefan-Meier-Strasse 21, D–79104 Freiburg, Germany. ' Freiburg Materials Research Center (FMF), Albert-Ludwig University Freiburg, Stefan-Meier-Strasse 21, D–79104 Freiburg, Germany

Abstract: Luminescent semiconductor nanocrystals were derivatised by mercaptocarboxylic acids. A direct synthesis in the solution of the ligand and a post-synthesis ligand exchange method was used. The two methods were compared and evaluated by isotachophoresis. The electrophoretic mobility, as well as the colloidal stability and the coverage with the ligand, were determined. An alternative method for concentration estimation of nanocrystals by isotachophoresis was introduced.

Keywords: semiconductor nanocrystals; isotachophoresis; laser-induced fluorescence detection; surface coverage; ligand; colloidal stability; nanocrystal solutions concentration; security; nanotechnology; luminescence; electrophoretic mobility.

DOI: 10.1504/IJNT.2007.013475

International Journal of Nanotechnology, 2007 Vol.4 No.3, pp.298 - 308

Published online: 01 May 2007 *

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