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Electrical Control of LSPR from Gold Nanoparticles Using Electrochemical Oxidation

Published online by Cambridge University Press:  31 January 2011

Takashi Miyazaki ,
Rei Hasegawa ,
Hajime Yamaguchi ,
Hitoshi Nagato ,
Haruhi Oh-oka ,
Isao Amemiya  and
Shuichi Uchikoga
Takashi Miyazaki
Affiliation:
takashi5.miyazaki@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Rei Hasegawa
Affiliation:
ray.hasegawa@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Hajime Yamaguchi
Affiliation:
hajime.yamaguchi@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Hitoshi Nagato
Affiliation:
hitoshi.nagato@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Haruhi Oh-oka
Affiliation:
haruhi.oooka@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Isao Amemiya
Affiliation:
isao.amemiya@toshiba.co.jp, Toshiba Corporation, Corporate Research & Development Center, Kawasaki, Japan
Shuichi Uchikoga
Affiliation:
shuichi.uchikoga@toshiba.co.jp, Toshiba Corporation, Toshiba Research Europe Limited, Cambridge, United Kingdom
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Abstract

Large shift of localized surface plasmon resonance (LSPR) spectrum of gold nanoparticles was attained by electrochemical oxidation of the nanoparticle surface. This oxidation occurred in a cell consisting of a pair of indium tin oxide (ITO) electrodes with water medium between the electrodes. On one side of the ITO electrode, the gold nanoparticles were adsorbed. The LSPR spectrum was moved consecutively to the red by increasing the applied positive voltage. By the application of 5 V to the cell, the spectrum shift as large as 55 nm was obtained. Though the spectrum shift has already been observed by changing liquid crystal (LC) orientation surrounding gold nanoparticles, the amount of the shift was not large (11 nm). That was because the variation of the effective refractive index of LC was rather small. Our large shift due to electrochemical oxidation resulted from the large refractive index of Au-O. The upper limit of the LSPR spectrum shift by our method is estimated to be 138 nm.

Keywords

Aunanostructureoptical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1208: Symposium O – Excitons and Plasmon Resonances in Nanostructures II , 2009 , 1208-O10-04
Copyright
Copyright © Materials Research Society 2010

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