Electrochemical Growth of Gold Nanostructures for Surface-Enhanced Raman Scattering

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• 作者：Yu-Cheng Yang ; Ting-Kai Huang ; Yu-Liang Chen ; Jean-Yves Mevellec ; Serge Lefrant ; Chi-Young Lee ; Hsin-Tien Chiu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：1932-1939
• 全文大小：1102K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1932-7455

文摘

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鈭? 渭m in width and 150鈭?00 nm in thickness. The Au NTs were 1鈭? 渭m in height, 300鈭?00 nm in bottom side width, and 20 nm at the apex. The Au NWs were 30鈭?0 nm in diameter and about 20 渭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 鈥渉ot spot鈥?generated at the crossing of the Au NWs. With the Au NWs, Rhodamine 6G can be detected at a concentration as low as 10^鈭? M.