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Journal of Nanomaterials
Volume 2013, Article ID 631350, 17 pages
Review Article

Shape-Controlled Metal Nanoparticles and Their Assemblies with Optical Functionalities

1Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi 441-8580, Japan
2Department of Frontier Materials, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

Received 26 September 2012; Revised 4 December 2012; Accepted 4 December 2012

Academic Editor: Yong Yang

Copyright © 2013 Go Kawamura 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.


Metal nanoparticles (NPs) possess excellent optical, optoelectronic, and optochemical properties based on their surface plasmon resonance. However, for practical use, the morphology and assembly of metal NPs need to be controlled. Here, we review facile control methods including seed-mediated growth accompanied with a comproportionation reaction of seeds to control their morphology and assembly. Several synthetic conditions have been modified to precisely control the morphology of metal NPs. Functionalized mesoporous oxides have also been used as hard templates to align metal nanorods and control their dimensions. The high performance of such metal nanorods in surface-enhanced Raman scattering, polarization of light, and photocatalysis has been measured, and the reasons for their high performance are discussed.