纳米金增强拉曼散射。

IF 1.5 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Jeonghwan Kim, Kyung-Nam Kang, Anirban Sarkar, Pallavi Malempati, Dooyoung Hah, Theda Daniels-Race, Martin Feldman
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引用次数: 5

摘要

传统的拉曼散射是检测和鉴定复杂分子样品的主要技术。在表面增强拉曼散射中,靠近样品的纳米级金属表面极大地增强了拉曼信号。在这项工作中,表面是在一个透明的环氧基板上。环氧树脂被浇铸在硅片上,使用20纳米的金作为脱模剂。这个单步过程已经产生了有用的增强拉曼信号。然而,拉曼信号通过(1)在环氧基板上沉积额外的金和(2)在铸造环氧基板之前使用干湿蚀刻的组合来粗糙硅基板来进一步增强。透明衬底的优点是,拉曼信号可以通过光通过衬底获得,不透明的样品简单地放置在表面上。结果是在去离子水中的罗丹明6G溶液在1 nM到1 mM的浓度范围内得到的。在所有情况下,信噪比均大于10:1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanorough gold for enhanced Raman scattering.

Nanorough gold for enhanced Raman scattering.

Nanorough gold for enhanced Raman scattering.

Conventional Raman scattering is a workhorse technique for detecting and identifying complex molecular samples. In surface enhanced Raman scattering, a nanorough metallic surface close to the sample enhances the Raman signal enormously. In this work, the surface is on a clear epoxy substrate. The epoxy is cast on a silicon wafer, using 20 nm of gold as a mold release. This single step process already produces useful enhanced Raman signals. However, the Raman signal is further enhanced by (1) depositing additional gold on the epoxy substrate and (2) by using a combination of wet and dry etches to roughen the silicon substrate before casting the epoxy. The advantage of a clear substrate is that the Raman signal may be obtained by passing light through the substrate, with opaque samples simply placed against the surface. Results were obtained with solutions of Rhodamine 6G in deionized water over a range of concentrations from 1 nM to 1 mM. In all cases, the signal to noise ratio was greater than 10:1.

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来源期刊
CiteScore
2.70
自引率
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发文量
146
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