Investigation of the Effects of the Local Environment on the Surface-Enhanced Raman Spectra of Striped Gold/Silver Nanorod Arrays

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• 作者：Brandy L. Broglin ; Aja Andreu ; Neetu Dhussa ; Jerry A. Heath ; Jr. ; Jeff Gerst ; Bruce Dudley ; David Holland ; Mahnaz El-Kouedi
• 刊名：Langmuir
• 出版年：2007
• 出版时间：April 10, 2007
• 年：2007
• 卷：23
• 期：8
• 页码：4563 - 4568
• 全文大小：403K
• 年卷期：v.23,no.8(April 10, 2007)
• ISSN：1520-5827

文摘

The effects of the local environment on surface-enhanced Raman scattering (SERS) spectra utilizing gold, silver,and gold/silver striped nanorod array substrates was investigated. The arrays were fabricated using an electrochemicalmetal deposition into an anodic aluminum oxide template. The analyte chosen for this study was p-nitroso-N,N-dimethylaniline (p-NDMA), which has an electronic structure that is highly sensitive to its surrounding environment.Changes in the peak positions and peak ratios were used to probe the influence of water and the striping pattern onthe SERS signal of p-NDMA. We present the results of the fabrication and characterization of the nanorod arraysubstrates, as well as SERS spectra of p-NDMA in both polar and nonpolar environments and SERS spectra on avariety of striped nanorod arrays. The Raman data suggests that the p-NDMA molecule exists in a more polarizedstate when bound to the gold as compared to the silver rods. We have attempted to use these differences to determinewhether the SERS signal predominantly arises from the tips of the rods or from the interior of the array.