Graphene Based Surface Plasmon Resonance (SPR) Sensors : An Approach to Enhance the Performance

Abstract

In surface plasmon resonance (SPR) sensors, compared to most metals silver (Ag) produces narrow reflectance curve resulting in high sensitivity. However, silver is highly susceptible to oxidation. Graphene on silver substrate provides high sensitivity and also protects undesired oxidation of silver. In this work graphene on silver configuration is further enhanced by integrating a titanium (Ti) layer for better adherence of silver on prism glass. Its performance has been measured in terms of sensitivity factor (SF), sensor merit (SM), full-width at half-maximum (FWHM) values and combined sensitivity factor (CSF). SF and CSF of the proposed sensor are 66.190/RIU and 258.59 RIU−1, respectively. These performances are far better than graphene on silver configuration without any adherence layer.