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Wellsted H, Sitsen E, Caragheorgheopol A, et al. Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles. Anal Chem. 2004;76(7):2010-6doi: 10.1021/ac035465x.
Wellsted, H., Sitsen, E., Caragheorgheopol, A., & Chechik, V. (2004). Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles. Analytical chemistry, 76(7), 2010-6. https://doi.org/10.1021/ac035465x
Wellsted, Helen, et al. "Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles." Analytical chemistry vol. 76,7 (2004): 2010-6. doi: https://doi.org/10.1021/ac035465x
Wellsted H, Sitsen E, Caragheorgheopol A, Chechik V. Polydisperse composition of mixed monolayer-protected, spin-labeled Au nanoparticles. Anal Chem. 2004 Apr 01;76(7):2010-6. doi: 10.1021/ac035465x. PMID: 15053665.
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Anal Chem. 2004 Apr 01;76(7):2010-6. doi: 10.1021/ac035465x.

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

Analytical chemistry

Helen Wellsted, Esther Sitsen, Agneta Caragheorgheopol, Victor Chechik

Affiliations

  1. Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K.

PMID: 15053665 DOI: 10.1021/ac035465x

Abstract

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.

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