Versatile Side-Illumination Geometry for Tip-Enhanced Raman Spectroscopy at Solid/Liquid Interfaces.
Versatile Side-Illumination Geometry for Tip-Enhanced Raman Spectroscopy at Solid/Liquid Interfaces.
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DOI：
10.1021/acs.analchem.6b01080
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发表时间：
2016-06
影响因子：
7.4
通讯作者：
Natalia Martín Sabanés;Leonie Driessen;Katrin F. Domke
中科院分区：
文献类型：
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作者：
Natalia Martín Sabanés;Leonie Driessen;Katrin F. Domke
用尖端增强拉曼光谱（TERS）对表面进行原位表征，提供了具有高空间分辨率和亚单层化学灵敏度的化学和形貌信息。为了进一步的多功能性的TERS方法对更复杂的系统，如生物膜或能量转换装置，该技术的适应固体/液体的工作条件是必不可少的。在这里，我们提出了一个自制的侧照明TERS设置设计的基础上，商业扫描隧道显微镜（STM）作为一个通用的，具有成本效益的解决方案，TERS在固/液界面。有趣的是，从展示共振染料和非共振苯硫酚单层吸附在Au单晶上得到的结果表明，由于水相的存在，激发光束像差足够小，不限制TER信号检测。STM参数被发现起着至关重要的作用，固体/液体TERS灵敏度。在μW激光功率下的拉曼增强因子为10（5），表明该实验装置在固/液界面光谱研究中具有很大的潜力。
In situ characterization of surfaces with tip-enhanced Raman spectroscopy (TERS) provides chemical and topographic information with high spatial resolution and submonolayer chemical sensitivity. To further the versatility of the TERS approach toward more complex systems such as biological membranes or energy conversion devices, adaptation of the technique to solid/liquid working conditions is essential. Here, we present a home-built side-illumination TERS setup design based on a commercial scanning tunneling microscope (STM) as a versatile, cost-efficient solution for TERS at solid/liquid interfaces. Interestingly, the results obtained from showcase resonant dye and nonresonant thiophenol monolayers adsorbed on Au single crystals suggest that excitation beam aberrations due to the presence of the aqueous phase are small enough not to limit TER signal detection. The STM parameters are found to play a crucial role for solid/liquid TERS sensitivity. Raman enhancement factors of 10(5) at μW laser power demonstrate the great potential the presented experimental configuration holds for solid/liquid interfacial spectroscopic studies.