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Wafer-scale silver nanoislands with ∼5 nm interstitial gaps for surface-enhanced Raman scattering
Optical Materials Express ( IF 2.8 ) Pub Date : 2020-11-20 , DOI: 10.1364/ome.411419
Hefu Li , Nan Zhao , Yangzhi Wang , Ruibin Zou , Zhenshan Yang , Changqing Zhu , Minghong Wang , Huishan Yu

Nanogap-rich silver nanoislands with fascinating optical properties are desirable substrates for surface-enhanced Raman scattering (SERS). Here, we propose a simple and high-throughput approach through the laser molecular beam epitaxy (LMBE) technique for preparing silver nanoislands containing large numbers of intra-nanogaps on a silicon wafer (6×6 cm2). By optimizing the deposition time, the enlarged silver nanoislands with ∼5 nm interstitial gaps of abundance and homogeneity were formed. Remarkably, the optimized SERS substrate with high-density hotspots demonstrated a high analytical enhancement factor (AEF) as large as 1.17×105, excellent reproducibility with relative standard deviation (RSD) of 7.76% over the entire substrate, and good stability after storage for 21 days. The electromagnetic field distribution of the optimized SERS substrate was simulated using the software COMSOL Multiphysics based on the actual SEM image of the fabricated sample, and the calculated enhancement factor (EF) is as high as 109. Furthermore, it can enable sensitive and quantitative detection of malachite green at concentrations as low as 10−8 M. This simple fabrication of silver nanoislands with homogeneous ∼5 nm interstitial gaps provides a practical solution for wafer-scale, sensitive, and reproducible SERS substrates.

中文翻译:

具有~5 nm 间隙的晶圆级银纳米岛,用于表面增强拉曼散射

具有迷人光学特性的富含纳米间隙的银纳米岛是表面增强拉曼散射 (SERS) 的理想基材。在这里,我们提出了一种简单且高通量的方法,通过激光分子束外延 (LMBE) 技术在硅片 (6×6 cm2) 上制备包含大量内部纳米间隙的银纳米岛。通过优化沉积时间,形成了具有约 5 nm 丰度和均匀性间隙间隙的扩大银纳米岛。值得注意的是,优化后的具有高密度热点的 SERS 基板表现出高达 1.17×105 的高分析增强因子 (AEF),整个基板上的相对标准偏差 (RSD) 为 7.76%,具有良好的重现性,以及良好的存储稳定性21 天。
更新日期:2020-11-20
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