Title: Electrochemical Growth of Gold Nanostructures for Surface-Enhanced Raman Scattering
Authors: Yang, Yu-Cheng
Huang, Ting-Kai
Chen, Yu-Liang
Mevellec, Jean-Yves
Lefrant, Serge
Lee, Chi-Young
Chiu, Hsin-Tien
Department of Applied Chemistry
Issue Date: 10-Feb-2011
Abstract: We demonstrate a facile fabrication of gold nanostructures including Au nanoplates (NPs), Au nanothorns (NTs), and Au nanowires (NWs) on indium tin oxide substrates via electrochemical growth. A simple two-electrode electrochemical deposition system was applied for the fabrication process. Dense Au nanostructures were grown directly on an Au seeding layer on the substrate. After 48 h, the Au NPs were 2-5 mu m in width and 150-200 nm in thickness. The Au NTs were 1-3 mu m in height, 300-500 nm in bottom side width, and 20 nm at the apex. The Au NWs were 30-80 nm in diameter and about 20 mu m in length. The entire process was template-free and economical. We investigated the correlation between surface plasmon resonance (SPR) and surface enhanced scattering (SERS) effects of the Au nanostructures with different excitation wavelengths. By using the SPR absorption maxima of the nanostructures as the excitation wavelengths for SERS, the highest SERS enhancements were achieved. SERS effects of the Au NWs were investigated further. We discovered that the length and the density of the Au NWs affected the SERS performance significantly. The result is rationalized by the amount of "hot spot" generated at the crossing of the Au NWs. With the Au NWs, Rhodamine 6G can be detected at a concentration as low as 10(-9) M.
URI: http://dx.doi.org/10.1021/jp1073544
ISSN: 1932-7447
DOI: 10.1021/jp1073544
Volume: 115
Issue: 5
Begin Page: 1932
End Page: 1939
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