Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement
Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement
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DOI：
10.1002/jrs.4920
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发表时间：
2016-09
影响因子：
2.5
通讯作者：
F. Mohaghegh;Alireza Mazaheri Tehrani;A. Materny
中科院分区：
文献类型：
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作者：
F. Mohaghegh;Alireza Mazaheri Tehrani;A. Materny
使用基于 Kretschmann 配置的设置，在尼罗蓝单层上进行了表面增强拉曼散射 (SERS) 实验。该实验已被优化以达到可重复的条件。激光激发导致拉曼线强度快速衰减，最终达到稳定的信号水平。我们具体分析了这种强度变化模式。发现不同振动模式的拉曼失活率不同，其中高波数振动比低波数模式组显示出更慢的衰减。获得的 SERS 光谱排除了激发激光束不同入射角的失活过程的贡献。涂覆在 Kretschmann 配置的棱镜表面上的银薄膜中表面等离子体激元激发的变化导致不同拉曼模式的相对增强截然不同，这表明单层 SERS 实验中化学增强机制的主要贡献。发现增强功能是特定于模式的。高波数模式比低波数组表现出更强的增强。版权所有 © 2016 约翰·威利父子有限公司
Using a Kretschmann configuration-based setup, surface-enhanced Raman scattering (SERS) experiments have been performed on a monolayer of Nile blue. The experiment has been optimized to achieve reproducible conditions. Laser excitation resulted in a fast decay of the Raman line intensities ending at a stable signal level. We have analyzed this intensity variation mode specifically. The Raman deactivation rate was found to be different for different vibrational modes where high-wavenumber vibrations showed slower decay than the group of low-wavenumber modes. SERS spectra were obtained excluding the contribution of this deactivation process for different angles of incidence of the exciting laser beam. The variation of the surface plasmon excitation in the thin silver film coated onto the prism surface of the Kretschmann configuration resulted in drastically different relative enhancements of the different Raman modes pointing to a major contribution of the chemical enhancement mechanism in the single-layer SERS experiment. The enhancement was found to be mode-specific. High-wavenumber modes showed a stronger enhancement than the low-wavenumber group. Copyright © 2016 John Wiley & Sons, Ltd.