Anisotropic surface-enhanced Raman scattering in shape-controlled Ag microcoils
Anisotropic surface-enhanced Raman scattering in shape-controlled Ag microcoils
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DOI：
10.1016/j.matlet.2021.130178
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发表时间：
2021-06
影响因子：
3
通讯作者：
Xu Zhao;Kensuke Sakuma;M. Yamaguchi;M. Muraoka
中科院分区：
文献类型：
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作者：
Xu Zhao;Kensuke Sakuma;M. Yamaguchi;M. Muraoka
Ag纳米结构表面增强拉曼散射（SERS）衬底由于具有较大的比表面积，容易被硫化物氧化和腐蚀，导致严重的劣化。相比之下，微米大小的银结构在化学上更稳定。然而，由于银微结构缺乏热点，没有关于利用银微结构作为SERS底物的报道。本文首次在线圈直径和节距为微米级的螺旋Ag结构中观察到SERS。通过控制银微线圈的形状，研究了几何主导的各向异性SERS效应。提出了一个新的模型来解释银微线圈中热点形成的机理。这项研究的结果应该有助于开发改进的SERS底物。
Ag nanostructure-based surface-enhanced Raman scattering (SERS) substrates tend to be oxidized and corroded by sulfides owing to their large specific surface area, resulting in severe deterioration. Contrastingly, micrometer-sized Ag structures are more chemically stable. Nevertheless, no reports exist on the utilization of Ag microstructures as SERS substrates, as they lack hot spots. Herein, for the first time, SERS is observed in helical Ag structures with coil diameters and pitches of the micrometer order. The geometry-dominated anisotropic SERS effect is investigated by controlling the shape of Ag microcoils. A new model is proposed to elucidate the mechanism of hot spot formation in Ag microcoils. The results of this study should aid efforts to develop improved SERS substrates.