Polydisperse composition of mixed mono layer-protected, spin-labeled Au nanoparticles

H Wellsted; E Sitsen; A Caragheorgheopol; V Chechik

doi:10.1021/ac035465x

Polydisperse composition of mixed mono layer-protected, spin-labeled Au nanoparticles

H Wellsted, E Sitsen, A Caragheorgheopol, V Chechik

Chemistry

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	2010-2016
Number of pages	7
Journal	Analytical Chemistry
Volume	76
Issue number	7
DOIs	https://doi.org/10.1021/ac035465x
Publication status	Published - 1 Apr 2004

Keywords

SIZE-EXCLUSION CHROMATOGRAPHY
CLUSTER MOLECULES
PARTICLES
DYNAMICS
GROWTH
SHAPE

Access to Document

10.1021/ac035465x

http://dx.doi.org/10.1021/ac035465x

Cite this

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title = "Polydisperse composition of mixed mono layer-protected, spin-labeled Au nanoparticles",

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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T1 - Polydisperse composition of mixed mono layer-protected, spin-labeled Au nanoparticles

AU - Wellsted, H

AU - Sitsen, E

AU - Caragheorgheopol, A

AU - Chechik, V

PY - 2004/4/1

Y1 - 2004/4/1

N2 - 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.

AB - 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.

KW - SIZE-EXCLUSION CHROMATOGRAPHY

KW - CLUSTER MOLECULES

KW - PARTICLES

KW - DYNAMICS

KW - GROWTH

KW - SHAPE

U2 - 10.1021/ac035465x

DO - 10.1021/ac035465x

M3 - Article

SN - 0003-2700

VL - 76

SP - 2010

EP - 2016

JO - Analytical Chemistry

JF - Analytical Chemistry

IS - 7

ER -