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SERS using two-photon polymerized nanostructures for mycotoxin detection

机译：使用双光子聚合纳米结构进行霉菌毒素检测的SERS

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摘要

Improved chemical- and bio-sensing with Surface Enhanced Raman Spectroscopy (SERS) requires nanostuctures that can be flexibly designed and fabricated with different physical and optical properties. Here, we present nano-pillar arrays ranging from 200 nm to 600 nm as SERS substrates for mycotoxin detection that are fabricated by means of two-photon polymerization. We built a nominal shape and a voxel-based model for simulating the enhancement of the electric field of the nano-pillar arrays using the Finite-Difference Time-Domain (FDTD) method. A new model was built based on the Atomic Force Microscopy (AFM) data obtained from the fabricated nanostructures and introduced into a FDTD model. We demonstrated the enhancement behavior by measuring the Raman spectrum of Rhodamine B solutions. Both the simulations and experimental results suggest that the 200 nm nano-pillar array has the highest Enhancement Factor (EF). Besides, we determined the limit of detection of the 200 nm pillar array by performing Raman measurements on Rhodamine B solutions with different concentrations. The detection limit of our 200 nm nano-pillar array is 0.55 mu M. Finally we discriminated 1 ppm deoxynivalenol and 1.25 ppm fumonisin b1 in acetonitrile solutions by our SERS substrate in combination with principal component analysis. This versatile approach for SERS substrates fabrication gives new opportunities for material characterization in chemical and biological applications.
机译：利用表面增强拉曼光谱（SERS）改进了化学和生物感应，需要纳米瘘管，可以灵活地设计和制造不同的物理和光学性质。这里，我们将纳米柱阵列从200nm至600nm的纳米柱阵列中呈现为肌毒素毒素检测的SERS基材，其通过双光子聚合制备。我们建立了一种标称形状和基于体素的模型，用于使用有限差分时域（FDTD）方法模拟纳米柱阵列的电场的增强。基于从制造的纳米结构获得的原子力显微镜（AFM）数据构建了一种新模型，并引入FDTD模型。通过测量罗丹明B溶液的拉曼光谱，我们证明了增强行为。模拟和实验结果表明，200nm纳米柱阵列具有最高的增强因子（EF）。此外，我们通过对具有不同浓度的罗丹明B溶液进行拉曼测量来确定200nm柱阵列的检测极限。我们的200nm纳米柱阵列的检出限为0.55μm。最后，我们通过我们的SERS底物与主要成分分析相结合地将1ppm脱氧苯酚和1.25ppm fumonisin b1区别在乙腈溶液中。对于SERS基材制造的这种多功能方法为化学和生物学应用中的材料表征提供了新的机会。

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  • 来源
    《RSC Advances》 |2020年第24期|共9页
  • 作者

    Liu Qing; Vanmol Koen; Lycke Sylvia; Van Erps Juergen; Vandenabeele Peter; Thienpont Hugo; Ottevaere Heidi;

  • 作者单位

    Vrije Univ Brussel Dept Appl Phys &

    Photon Brussels Photon Pl Laan 2 B-1050 Brussels Belgium;

    Vrije Univ Brussel Dept Appl Phys &

    Photon Brussels Photon Pl Laan 2 B-1050 Brussels Belgium;

    Univ Ghent Dept Chem Krijgslaan 281-S3 B-9000 Ghent Belgium;

    Vrije Univ Brussel Dept Appl Phys &

    Photon Brussels Photon Pl Laan 2 B-1050 Brussels Belgium;

    Univ Ghent Dept Chem Krijgslaan 281-S3 B-9000 Ghent Belgium;

    Vrije Univ Brussel Dept Appl Phys &

    Photon Brussels Photon Pl Laan 2 B-1050 Brussels Belgium;

    Vrije Univ Brussel Dept Appl Phys &

    Photon Brussels Photon Pl Laan 2 B-1050 Brussels Belgium;

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  • 正文语种 eng
  • 中图分类 化学;
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