Improving the Detection Accuracy of an Ag/Au Bimetallic Surface Plasmon Resonance Biosensor Based on Graphene

被引：19
|
作者：
Wang, Qi [1 ]
Cao, Shuhua [1 ]
Gao, Xufeng [1 ]
Chen, Xinrui [1 ]
Zhang, Dawei [1 ]
机构：
[1] Univ Shanghai Sci & Technol, Sch Opt Elect & Comp Engn, Engn Res Ctr Opt Instrument & Syst, Shanghai Key Lab Modern Opt Syst, 516 Jungong Rd, Shanghai 200093, Peoples R China
来源：
CHEMOSENSORS | 2022年 / 10卷 / 01期
基金：
中国国家自然科学基金;
关键词：
surface plasmon resonance; chalcogenide prism; graphene; detection accuracy; chemical potential; SENSITIVITY; PERFORMANCE; ENHANCEMENT; SENSOR; WS2;
D O I：
10.3390/chemosensors10010010
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A theoretical study was conducted with the aim of improving the detection accuracy of graphene-based surface plasmon resonance (SPR) biosensors. We studied the effect of applying a bias voltage to the sensor surface on its detection accuracy. The optimum thicknesses of silver and gold layers in the biosensor of 47 nm and 3 nm, respectively, were determined. Graphene layers deposited on these thin silver and gold films formed a sensor surface system, on which the surface plasmons were excited. The real and imaginary parts of the refractive index of graphene were controlled by the bias voltage. When the chemical potential was increased from 36 meV to 8 eV, the detection accuracy of the sensor was correspondingly increased by 213%.
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页数：13
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