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Large-Scale, Lithography-Free Production of Transparent Nanostructured Surface for Dual-Functional Electrochemical and SERS Sensing
ACS Sensors ( IF 8.2 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acssensors.7b00783 Kuldeep Sanger 1 , Onur Durucan 1 , Kaiyu Wu 1 , Anil Haraksingh Thilsted 1 , Arto Heiskanen 1 , Tomas Rindzevicius 1 , Michael Stenbæk Schmidt 1 , Kinga Zór 1 , Anja Boisen 1
ACS Sensors ( IF 8.2 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acssensors.7b00783 Kuldeep Sanger 1 , Onur Durucan 1 , Kaiyu Wu 1 , Anil Haraksingh Thilsted 1 , Arto Heiskanen 1 , Tomas Rindzevicius 1 , Michael Stenbæk Schmidt 1 , Kinga Zór 1 , Anja Boisen 1
Affiliation
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In this work, we present a dual-functional sensor that can perform surface-enhanced Raman spectroscopy (SERS) based identification and electrochemical (EC) quantification of analytes in liquid samples. A lithography-free reactive ion etching process was utilized to obtain nanostructures of high aspect ratios distributed homogeneously on a 4 in. fused silica wafer. The sensor was made up of three-electrode array, obtained by subsequent e-beam evaporation of Au on nanostructures in selected areas through a shadow mask. The SERS performance was evaluated through surface-averaged enhancement factor (EF), which was ∼6.2 × 105, and spatial uniformity of EF, which was ∼13% in terms of relative standard deviation. Excellent electrochemical performance and reproducibility were revealed by recording cyclic voltammograms. On nanostructured electrodes, paracetamol (PAR) showed an improved quasi-reversible behavior with decrease in peak potential separation (ΔEp ∼ 90 mV) and higher peak currents (Ipa/Ipc ∼ 1), compared to planar electrodes (ΔEp ∼ 560 mV). The oxidation potential of PAR was also lowered by ∼80 mV on nanostructured electrodes. To illustrate dual-functional sensing, quantitative evaluation of PAR ranging from 30 μM to 3 mM was realized through EC detection, and the presence of PAR was verified by its SERS fingerprint.
中文翻译：
大规模，无光刻的透明纳米结构表面的双功能电化学和SERS传感
在这项工作中，我们提出了一种双功能传感器，可以执行基于表面增强拉曼光谱（SERS）的识别和电化学（EC）定量分析液体样品中分析物的功能。利用无光刻的反应性离子刻蚀工艺来获得高纵横比的纳米结构，该纳米结构均匀分布在4英寸熔融石英晶片上。该传感器由三电极阵列组成，该三电极阵列通过随后通过荫罩在选定区域中的纳米结构上进行电子束金的随后电子束蒸发而获得。通过表面平均增强因子（EF）评估SERS性能，该因子约为6.2×10 5，以及EF的空间均匀性，相对标准偏差约为13％。记录的循环伏安图显示了优异的电化学性能和可重复性。上纳米结构的电极，对乙酰氨基酚（PAR）表现出与在峰电势隔离下降的改进的准可逆的行为（Δ Ë p〜90毫伏）和更高的峰值电流（我PA /我的电脑〜1），相对于平面电极（Δ Ë p〜560 mV）。在纳米结构电极上，PAR的氧化电势也降低了约80 mV。为了说明双功能传感，通过EC检测实现了对PAR范围从30μM到3 mM的定量评估，并通过其SERS指纹验证了PAR的存在。
更新日期：2017-12-06
中文翻译：
大规模，无光刻的透明纳米结构表面的双功能电化学和SERS传感
在这项工作中，我们提出了一种双功能传感器，可以执行基于表面增强拉曼光谱（SERS）的识别和电化学（EC）定量分析液体样品中分析物的功能。利用无光刻的反应性离子刻蚀工艺来获得高纵横比的纳米结构，该纳米结构均匀分布在4英寸熔融石英晶片上。该传感器由三电极阵列组成，该三电极阵列通过随后通过荫罩在选定区域中的纳米结构上进行电子束金的随后电子束蒸发而获得。通过表面平均增强因子（EF）评估SERS性能，该因子约为6.2×10 5，以及EF的空间均匀性，相对标准偏差约为13％。记录的循环伏安图显示了优异的电化学性能和可重复性。上纳米结构的电极，对乙酰氨基酚（PAR）表现出与在峰电势隔离下降的改进的准可逆的行为（Δ Ë p〜90毫伏）和更高的峰值电流（我PA /我的电脑〜1），相对于平面电极（Δ Ë p〜560 mV）。在纳米结构电极上，PAR的氧化电势也降低了约80 mV。为了说明双功能传感，通过EC检测实现了对PAR范围从30μM到3 mM的定量评估，并通过其SERS指纹验证了PAR的存在。
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