Conductance Sensitivity Evaluation of Trilayer Graphene Nanoribbon-Based Electrochemical Biosensor for Charged Lipid Bilayer Detection

The performance of an electrolyte-gated field-effect transistor based on trilayer graphene nanoribbon (TGN) and adsorption effect on sensing parameters was investigated. In the proposed model, TGN carrier concentration as a function of electric charge and thickness of the charged lipid bilayer (CLB) is considered and to obtain the characteristics including quantum capacitance, conductance and current-voltage characteristic, the suitable control parameters are defined. Moreover, TGN conductance as a electrical detection platform of each electric charge membrane together with membrane thickness is analytically investigated. The obtained results confirm that the minimum level of conductance of the biosensor is decreased and V g- min is obviously left-shifted by increasing value of membrane thickness. In order to verify the performance of proposed biosensor, it is compared with recent theoretical and experimental reports of CLB biosensors. The analytical model of TGN-based electrochemical biosensor for CLB detection has not been performed until now, so computational investigation of the device performance and adsorption effect on the sensing parameters is one of the interesting steps in this study. As a result, the proposed TGN-based biosensor with significant conductance sensitivity and high current-voltage characteristic exposes relatively higher performance compared to those of CLB counterparts for analogous ambient conditions.