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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Enhanced Sensitivity of Anti-Symmetrically Structured Surface Plasmon Resonance Sensors with Zinc Oxide Intermediate Layers
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Enhanced Sensitivity of Anti-Symmetrically Structured Surface Plasmon Resonance Sensors with Zinc Oxide Intermediate Layers

机译：具有氧化锌中间层的反对称结构表面等离子体共振传感器的增强的灵敏度

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摘要

We report a novel design wherein high-refractive-index zinc oxide (ZnO) intermediary layers are used in anti-symmetrically structured surface plasmon resonance (SPR) devices to enhance signal quality and improve the full width at half maximum (FWHM) of the SPR reflectivity curve. The surface plasmon (SP) modes of the ZnO intermediary layer were excited by irradiating both sides of the Au film, thus inducing a high electric field at the Au/ZnO interface. We demonstrated that an improvement in the ZnO (002) crystal orientation led to a decrease in the FWHM of the SPR reflectivity curves. We optimized the design of ZnO thin films using different parameters and performed analytical comparisons of the ZnO with conventional chromium (Cr) and indium tin oxide (ITO) intermediary layers. The present study is based on application of the Fresnel equation, which provides an explanation and verification for the observed narrow SPR reflectivity curve and optical transmittance spectra exhibited by (ZnO/Au), (Cr/Au), and (ITO/Au) devices. On exposure to ethanol, the anti-symmetrically structured showed a huge electric field at the Au/ZnO interface and a 2-fold decrease in the FWHM value and a 1.3-fold larger shift in angle interrogation and a 4.5-fold high-sensitivity shift in intensity interrogation. The anti-symmetrically structured of ZnO intermediate layers exhibited a wider linearity range and much higher sensitivity. It also exhibited a good linear relationship between the incident angle and ethanol concentration in the tested range. Thus, we demonstrated a novel and simple method for fabricating high-sensitivity, high-resolution SPR biosensors that provide high accuracy and precision over relevant ranges of analyte measurement.
机译：我们报告了一种新颖的设计，其中高折射率氧化锌（ZnO）中间层用于反对称结构的表面等离子体共振（SPR）设备中，以增强信号质量并改善SPR的半峰全宽（FWHM）反射率曲线。 ZnO中间层的表面等离激元（SP）模式通过辐照Au膜的两面而激发，从而在Au / ZnO界面处产生高电场。我们证明了ZnO（002）晶体取向的改善导致SPR反射率曲线的FWHM降低。我们使用不同的参数优化了ZnO薄膜的设计，并对ZnO与常规铬（Cr）和铟锡氧化物（ITO）中间层进行了分析比较。本研究基于菲涅尔方程的应用，该方程为观察到的窄ZnR反射率曲线和（ZnO / Au），（Cr / Au）和（ITO / Au）器件显示的光透射光谱提供了解释和验证。 。暴露于乙醇中时，反对称结构在Au / ZnO界面上显示出巨大的电场，FWHM值降低2倍，角度询问的位移大1.3倍，高灵敏度位移4.5倍在强度审讯中。 ZnO中间层的反对称结构表现出更宽的线性范围和更高的灵敏度。在测试范围内，它在入射角和乙醇浓度之间也表现出良好的线性关系。因此，我们展示了一种新颖，简单的方法来制造高灵敏度，高分辨率的SPR生物传感器，该方法可在相关分析物测量范围内提供高精度和高精度。

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