Numerical Investigation of Graphene-Gold Spr-
Based Biosensor
Volume 1 - Issue 4
Saeideh Jafari1, Jafar Mostafavi Amjad2, Ramin Mohammadkhani1 and Peyman Jahanshahi3*
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- 1Department of physics, Faculty of Science, University of Zanjan, 45371-38791, Iran
- 2Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Iran
- 3Institute of Intelligent Manufacturing and Information Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University,
China
*Corresponding author:
Peyman Jahanshahi, School of Mechanical Engineering, Shanghai Jiao Tong University, China
Received: March 06, 2018; Published: March 13, 2018
DOI: 10.32474/OAJBEB.2018.01.000120
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Abstract
This short study is aimed to investigate the graphene-gold surface plasmon resonance (SPR)-based biosensor by optimizing
the graphene and gold layers respectively. Gold (Au) is used as a noble-metal material whereas graphene is used to avoid Au from
oxidation and enhance the reflectance intensity of biosensor as well as increase molecular absorbance on the sensor surface for
improving sensitivity. Numerical analysis is performed using finite-element method (FEM) by comparing the sensing performance
such as reflectance intensity that explains the sensor sensitivity. The measurements are presented with various graphene thin film
thicknesses in 3nm, 5nm, and 6nm with 800nm operating wavelength, and then considered the different gold thicknesses (10nm to
70nm). The proposed sensor shows that the five-layer graphene-40nm thick gold SPR-based sensor gave better performance with
narrower plasmonic spectrum line width. The obtained results also indicate that the graphene-gold SPR-based sensor is suitable for
medical diagnostics in immunoassays.
Keywords: Surface Plasmon Resonance; Biosensor; Graphene; Numerical Analysis
Abbrevations: SPR: Surface Plasmon Resonance; Au: Gold; Ti: Titanium; FEM: Finite-Element Method
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