Surface-Enhanced Raman Spectroscopy for Molecule Characterization: HIM Investigation into Sources of SERS Activity of Silver-Coated Butterfly Scales.
Surface-Enhanced Raman Spectroscopy for Molecule Characterization: HIM Investigation into Sources of SERS Activity of Silver-Coated Butterfly Scales.
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DOI：
10.3390/nano11071741
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发表时间：
2021-07-01
期刊：
影响因子：
--
通讯作者：
Okamoto T
中科院分区：
文献类型：
--
作者：
Takei H;Nagata K;Frese N;Gölzhäuser A;Okamoto T
表面增强拉曼光谱（SERS）是一种获取低浓度溶液中分子结构信息的有力技术。虽然商用SERS基板是可用的，但高成本阻碍了它们在医疗领域的广泛应用。一种解决方案是利用天然纳米结构制备所需的贵金属纳米结构。作为仿生方法的一个例子，已经发现具有复杂纳米结构的蝴蝶翅膀鳞片在涂上银后表现出精美的SERS活性。从特定种类的蝴蝶中选择合适的鳞片并沉积一定厚度的银，可以产生显著的SERS活性。形态学观察我们使用扫描电子显微镜以及氦离子显微镜，非常适合于形态学表征的低导电性样品。在本文中，我们描述了一种基于蝴蝶翅膀尺度进行SERS测量的方案，并使用常见的拉曼报告器罗丹明6 g演示了其LOD。我们还强调了在此类测量中需要特别注意的事项。我们还试图通过仔细修改原始纳米结构来阐明是什么使鳞片作为SERS基底起作用。这样的研究使我们能够直接使用鳞片作为SERS衬底的原材料，或者为合成SERS衬底需要重建的纳米结构提供见解。
Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for obtaining structural information of molecules in solution at low concentrations. While commercial SERS substrates are available, high costs prevent their wide-spread use in the medical field. One solution is to prepare requisite noble metal nanostructures exploiting natural nanostructures. As an example of biomimetic approaches, butterfly wing scales with their intricate nanostructures have been found to exhibit exquisite SERS activity when coated with silver. Selecting appropriate scales from particular butterfly species and depositing silver of certain thicknesses leads to significant SERS activity. For morphological observations we used scanning electron microscopes as well as a helium ion microscope, highly suitable for morphological characterization of poorly conducting samples. In this paper, we describe a protocol for carrying out SERS measurements based on butterfly wing scales and demonstrate its LOD with a common Raman reporter, rhodamine 6 G. We also emphasize what special care is necessary in such measurements. We also try to shed light on what makes scales work as SERS substrates by carefully modifying the original nanostructures. Such a study allows us to either use scales directly as a raw material for SERS substrate or provides an insight as to what nanostructures need to be recreated for synthetic SERS substrates.
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