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Time dependent spectral change upon potential step perturbation for Au nanoparticles immobilized on an organic monolayer-modified ITO electrode


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タイトル: Time dependent spectral change upon potential step perturbation for Au nanoparticles immobilized on an organic monolayer-modified ITO electrode
著者: Toyota, Ayumi / Sagara, Takamasa
発行日: 2006年 9月 1日
出版者: Elsevier B.V.
引用: Colloids and Surfaces A 286(1-3), pp.62-69; 2006
抄録: Time dependent spectral change of Au nanoparticles immobilized on an ITO electrode upon the change of electrode potential was investigated. Au nanoparticles of a diameter of 11 nm were immobilized on a monolayer of alkylsiloxane with an amine or thiol end group on an ITO electrode. In addition to the previously clarified charging–discharging process of the particles in response to the sine-wave potential modulation at frequencies higher than 8 Hz, very slow relaxation of visible light absorption after a potential step was found in the present work. The transient of absorbance in response to the potential step was a sum of a fast component within 1 s and a slow single exponential component with a half-life of the order of 30–150 s. The half-life of the slow component and the magnitude ratio of the two components depended on the incident light wavelength and the direction of the potential step. These results suggested that the absorption spectrum of the Au nanoparticles after the potential change is time dependent. The relative magnitude of the slow relaxation in the total spectral change was enhanced in the presence of adsorptive electrolyte anions such as Cl− and Br−, especially at positive potentials, at the expense of the fast component. Implications of these results were discussed, and the possibility of the presence of a slow surface process on the Au nanoparticle surface in the presence of adsorptive anions was invoked.
キーワード: Au nanoparticles / ITO electrode / Plasmon absorption / Potential step transient / Anion effect
URI: http://hdl.handle.net/10069/20947
ISSN: 09277757
DOI: 10.1016/j.colsurfa.2006.03.003
権利: Copyright © 2006 Elsevier B.V. All rights reserved.
資料タイプ: Journal Article
原稿種類: author
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/20947

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