Metamaterial for Hydrogen Sensing
Metamaterial for Hydrogen Sensing
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DOI：
10.1021/acssensors.9b00980
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发表时间：
2019-09-01
期刊：
影响因子：
8.9
通讯作者：
Nishijima, Yoshiaki
中科院分区：
文献类型：
--
作者：
Beni, Takaaki;Yamasaku, Naoki;Nishijima, Yoshiaki
一种基于等离子体准表面的氢传感器具有行业要求的10 S反应时间和灵敏度。它由夹在顶部钯纳米盘和底部金镜之间的Y或WO_3层组成。相变层(Y，WO_3)与氢发生反应，通过红外光谱窗口的共振反射谱移检测到相应的折射率(介电常数)的变化。这种由吸氢引起的介电常数变化的直接反射读出是快速的，并且通过延伸到相变体积的辐射场增强来促进。用数值模拟的方法解释了折射率的实部和虚部对共振光谱漂移的影响。概述了传感器性能的机理，并通过Pd纳米盘的直径和相变材料的厚度来调整其光谱工作范围，使该设计适用于其他分子检测应用，包括表面增强型红外吸收。
A hydrogen sensor based on plasmonic metasurfaces is demonstrated to exhibit the industry-required 10 s reaction time and sensitivity. It consists of a layer of either Y or WO3 sandwiched between a top Pd nanodisk and a Au mirror at the base. The phase change layer (Y, WO3) reacts with hydrogen, and the corresponding change of the refractive index (permittivity) is detected by the spectral shift of the resonance dip in reflectance at the IR spectral window. This direct reflectance readout of the permittivity change due to hydrogen uptake is fast and is facilitated by radiation field enhancement extending into the phase change volume. Numerical modeling was used to elucidate the effects that real and imaginary parts of the refractive index exert on the spectral shifts of resonance. The mechanism of sensor performance is outlined, and a possibility to tune its spectral range of operation by the diameter of the Pd nanodisk and thickness of the phase change material makes this design applicable to other molecular detection applications including surface enhanced IR absorption.