Surface-enhanced Raman scattering with gold-coated silicon nanopillars arrays: The influence of size and spatial order
Surface-enhanced Raman scattering with gold-coated silicon nanopillars arrays: The influence of size and spatial order
复制标题
镀金硅纳米柱阵列的表面增强拉曼散射：尺寸和空间顺序的影响
DOI：
10.1016/j.saa.2021.120582
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ping Gao
中科院分区：
文献类型：
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作者：
Weisheng Yue;Yimin Fan;Tao Zhang;Tiancheng Gong;Xiyu Long;Yuefei Luo;Ping Gao
纳米柱由于其高灵敏度和优异的再现性，被广泛地用作表面增强拉曼散射（SERS）的有前途的衬底。目前的研究大多集中在纳米柱的制备方法上，很少研究SERS效应与几何尺寸和空间顺序的关系。本文研究了不同尺寸（115 ~ 185 nm）和不同空间顺序（方形和菱形）纳米柱的SERS特性。研究表明，纳米柱不仅具有高的增强能力和高的信号再现性，而且增强对尺寸和空间顺序不敏感。测量的增强因子（EFs）为2.3-4.0 × 106，信号重现性（相对标准偏差，RSD）为~ 5.2%-6.9%，是同类SERS底物中最好的。在115、135、145 ~ 160 nm范围内，随着柱尺寸的变化，SERS强度的变化幅度约为4.8%。纳米柱的低灵敏度和高重现性归因于局部表面等离子体共振（LSPR）和传播表面等离子体共振（SPPs）的联合激发。通过实验和数值研究了纳米柱的光学特性，以了解SERS性能背后的物理原理。
Nanopillars have been extensively explored as promising substrates for surface-enhanced Raman scattering (SERS) owing to their high sensitivity and excellent reproducibility. Most of the researches have been focused on the fabrication methods of nanopillars, and the dependences of SERS effects on geometrical size and spatial order are rarely investigated. In this work, SERS properties of nanopillars with different sizes (115–185 nm) and spatial orders (square and rhombus orders) have been studied. The work has shown that the nanopillars not only have high enhancement capability and high signal reproducibility, but also the enhancement is insensitive to the size and spatial orders. The measured enhancement factors (EFs) are 2.3–4.0 × 106and signal reproducibility (relative standard deviation, RSD) are ∼ 5.2%–6.9%, which are among the best of the similar SERS substrates reported. The variation of SERS intensity was as low as approximately 4.8% with the variation of pillar size from 115, 135, 145, to 160 nm. The insensitiveness and high reproducibility have been ascribed to the combined excitation of localized surface plasmon resonance (LSPR) and propagating surface plasmons (SPPs) of the nanopillars. Optical properties of the nanopillars are studied both experimentally and numerically to understand the physics behind the SERS performance.