Graphene-MoS2 hybrid nanostructures enhanced surface plasmon resonance biosensors
Graphene-MoS2 hybrid nanostructures enhanced surface plasmon resonance biosensors
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DOI：
10.1016/j.snb.2014.10.124
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发表时间：
2015-02-01
影响因子：
8.4
通讯作者：
Yong, Ken-Tye
中科院分区：
文献类型：
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作者：
Zeng, Shuwen;Hu, Siyi;Yong, Ken-Tye
在这项工作中，我们提出了一种基于石墨烯-MoS_2杂化结构的表面等离子体共振(SPR)传感器的新结构，用于超灵敏的分子检测。与无石墨烯-MoS_2涂层的SPR传感方案或仅有石墨烯涂层的SPR传感方案相比，所提出的系统具有500多倍的相敏性增强因子。我们的假设是MoS2层的光吸收效率(接近5%)远高于石墨烯层的光吸收效率(接近2.3%)。基于我们的发现，MoS2层的电子能量损失与石墨烯相当，这将使光能成功(类似于100%)转移到石墨烯-MoS2涂层的传感衬底上。这样的处理将导致SPR信号的显著增强。我们的模拟表明，在这种条件下可以实现反射光的亚类暗点，这导致了我们新提出的SPR系统的共振角的陡峭的相位跳跃。更重要的是，我们发现基于石墨烯-MoS_2混合结构传感系统的相位询问检测方法比常规角度询问方法更灵敏，我们的理论分析表明，45 nm的Au膜厚度和3层MoS_2纳米片是获得最高检测灵敏度所需的优化参数。(C)2014爱思唯尔B.V.保留所有权利。
In this work, we propose a new configuration of surface plasmon resonance (SPR) sensor based on graphene-MoS2 hybrid structures for ultrasensitive detection of molecules. The proposed system displays a phase-sensitivity enhancement factor of more than 500-fold when compared to the SPR sensing scheme without the graphene-MoS2 coating or with only graphene coating. Our hypothesis is that themono layer MoS2 has a much higher optical absorption efficiency (similar to 5%) than that of the graphene layer(similar to 2.3%). Based on our findings, the electron energy loss of MoS2 layer is comparable to that of graphene and this will allow a successful (similar to 100%) of light energy transfer to the graphene-MoS2 coated sensing substrate. Such process will lead to a significant enhancement of SPR signals. Our simulation shows that aquasi dark point of the reflected light can be achieved under this condition and this has resulted in a steep phase jump at the resonance angle of our newly proposed SPR system. More importantly, we found that phase interrogation detection approach of the graphene-MoS2 hybrid structures-based sensing system is more sensitive than that of using the regularly angular interrogation method and our theoretical analysis indicates that 45 nm of Au film thickness and 3 coating layers of MoS2 nanosheet are the optimized parameters needed for the proposed SPR system to achieve the highest detection sensitivity range. (C) 2014 Elsevier B.V. All rights reserved.