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Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles

Wellsted, H., Sitsen, E., Caragheorgheopo, A. and Chechik, V. (2004) Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles. Analytical Chemistry, 76 (7). pp. 2010-2016. ISSN 0003-2700

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Using EPR spectroscopy and spin-labeled ligands, we have studied product distribution in the ligand exchange reactions of Au nanoparticles. When the incoming ligand was used in excess, the exchanged nanoparticles had uniform composition of the organic shell. Preparative GPC was employed to fractionate these materials according to the diameter of the Au core, as confirmed by TEM, UV, and EPR measurements. When the exchange reaction was carried out with less than a stoichiometric amount of the incoming ligand, nanoparticles with polydisperse composition of the organic shell were formed. This was established by the EPR analysis of the exchange reaction mixtures following their GPC fractionation. The GPC separation of these mixtures is controlled by both Au core size and shell composition.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Chemistry (York)
Depositing User: York RAE Import
Date Deposited: 12 Aug 2009 15:57
Last Modified: 12 Aug 2009 15:57
Published Version: http://dx.doi.org/10.1021/ac035465x
Status: Published
Publisher: ACS American Chemical Society
Identification Number: 10.1021/ac035465x
URI: http://eprints.whiterose.ac.uk/id/eprint/5478

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