Numerical Investigation of Graphene-Gold Spr- Based Biosensor

Volume 1 - Issue 4

Saeideh Jafari¹, Jafar Mostafavi Amjad², Ramin Mohammadkhani¹ and Peyman Jahanshahi³*

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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