Light-Trapping SERS Substrate with Regular Bioinspired Arrays for Detecting Trace Dyes
Light-Trapping SERS Substrate with Regular Bioinspired Arrays for Detecting Trace Dyes
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DOI：
10.1021/acsami.1c00702
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发表时间：
2021-02-24
影响因子：
9.5
通讯作者：
Shi, Gang
中科院分区：
文献类型：
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作者：
Jin, Xuan;Zhu, Qunyan;Shi, Gang
近年来，关于硅微锥与银(或金)结合的光俘获表面增强拉曼散射(SERS)衬底的研究很少。然而，硅微锥体没有有序的周期，这不仅影响了SERS信号的重复性，也影响了理论探索。本文利用非常规纳米球光刻技术和各向异性湿法刻蚀技术制备了具有较强捕光能力的有序微金字塔。然后，利用液-固界面自组装和转移技术，将银纳米球组装在有序的微金字塔上，形成具有仿生复眼结构的SERS衬底。特别是首次提出了抗反射硅微锥体对拉曼增强的贡献。对于这种生物激发的SERS底物，单分子水平下可以检测到的最低R6G浓度为10(-13)M，相对标准偏差(RSD)为3.68%。同时，可以实现定量分析和定性分析。特别是实现了对食品中四种常见染料(R6G、CV、MG和MB)的同时痕量检测，表明该SERS衬底在光学传感器领域具有良好的应用前景。
Recently, few studies have focused on the light-trapping surface-enhanced Raman scattering (SERS) substrate combined with Si micropyramids and Ag (or Au). However, the Si micropyramids possess no ordered period, which not only affects the repeatability of the SERS signal but also affects the theoretical exploration. Here, the ordered micropyramids with strong light-trapping capability were fabricated by utilizing unconventional nanosphere lithography and anisotropy wet etching technique. Then, the Ag nanobowls were assembled on the ordered micropyramids to form the SERS substrate with bioinspired compound-eyes structure by utilizing the liquid-solid interface self-assembly and transfer technique. Especially, the evidence for the contribution of antireflective Si micropyramids to Raman enhancement was first presented. For this bioinspired SERS substrate, the lowest concentration of R6G that can be detected is 10(-13) M with the level of a single molecule, and the relative standard deviation (RSD) is 3.68%. Meanwhile, the quantitative analysis and qualitative analysis can be realized. Especially, simultaneous trace detection of four common dyes (R6G, CV, MG, and MB) in food can be realized, suggesting that this SERS substrate will have a good application prospect in the field of optical sensors.