Graphene-MoS2 hybrid nanostructures enhanced surface plasmon resonance biosensors

SENSORS AND ACTUATORS B-CHEMICAL

卷:207

Article

Zeng, Shuwen^1,2  Hu, Siyi^2,4  Xia, Jing³  Anderson, Tommy²  Dinh, Xuan-Quyen¹  Meng, Xiang-Min³  Coquet, Philippe^1,5  Yong, Ken-Tye^1,2 

[1] CINTRA CNRS NTU THALES, UMI 3288, Singapore 637553, Singapore

[2] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

[3] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing, Peoples R China

[4] Changchun Univ Sci & Technol, Sch Sci, Changchun 130022, Jilin, Peoples R China

[5] Univ Lille 1, CNRS UMR 8520, Inst Elect Microelect & Nanotechnol, F-59650 Villeneuve Dascq, France

关键词: Surface plasmon resonance;    Optical sensor;    Graphene;    MoS2;    Differential phase;    Enhanced biosensing;   

DOI  :  10.1016/j.snb.2014.10.124

来源: Elsevier

【 摘 要 】

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.

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