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Journal of Nanomaterials
Volume 2011, Article ID 405853, 7 pages
Research Article

Controlled Aspect Ratios of Gold Nanorods in Reduction-Limited Conditions

1School of Chemistry, Seoul National University, NS60, Seoul 151-747, Republic of Korea
2Electronics and Telecommunications Research Institute, Daejeon 305-700, Republic of Korea

Received 13 December 2010; Revised 5 March 2011; Accepted 28 April 2011

Academic Editor: Ping Xiao

Copyright © 2011 Jong-Yeob Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aspect ratios of gold nanorods have been finely modified in reduction-limited conditions via two electrochemical ways: by changing the amount of a growth solution containing small gold clusters in the presence of already prepared gold nanorods as seeds or by changing electrolysis time in the presence or absence of a silver plate. While the atomic molar ratio of gold in the growth solution to gold in the seed solution is critical in the former method, the relative molar ratio of gold ions to silver ions in the electrolytic solution is important in the latter way for the control of the aspect ratios of gold nanorods. The aspect ratios of gold nanorods decrease with an increase of electrolysis time in the absence of a silver plate, but they increase with an increase of electrolysis time in the presence of a silver plate.