Spin-labelled Au nanoparticles

被引：64

作者：

Chechik, V ^{[1
]}

Wellsted, HJ

Korte, A

Gilbert, BC

Caldararu, H

Ionita, P

Caragheorgheopol, A

机构：

[1] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England

[2] Inst Phys Chem, Bucharest 77202, Romania

来源：

FARADAY DISCUSSIONS | 2004年 / 125卷

关键词：

D O I：

10.1039/b302730a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of Au nanoparticles functionalised with nitroxide spin labels has been prepared and studied by EPR spectroscopy. Samples with low coverage of the spin label were used to investigate the dynamics of the surface-attached labels at different distances from the Au surface. The rotational correlation times of spin labels vary from 10(-10) s to more than 3 x 10(-9) s, depending on the chain length of the label and the Surrounding ligand. The samples with higher coverage of the spin label show an increasing contribution of the exchange interaction between nitroxides adsorbed in a close proximity to each other on the same nanoparticle. Quantitative analysis of the EPR spectra of these samples suggests the presence of non-equivalent binding sites on the surface of Au nanoparticles. Additionally, EPR signals of isolated radical pairs were observed at intermediate coverage.

引用

页码：279 / 291

页数：13

共 29 条

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