Vapor adsorption limitation of graphene nanoribbons in quasi conductance increment: a NEGF approach

Shifur Rahman Shakil, Fatema Tuz Zohra, P. Pramanik, R. I. Tushar, S. Atanu Kumar and M. Belal Hossain Bhuian, "Vapor adsorption limitation of graphene nanoribbons in quasi conductance increment: A NEGF approach," 10th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, Xi'an, China, 2015, pp. 366-371, doi: 10.1109/NEMS.2015.7147445.

Abstract

The adsorption of H2O molecules on Armchair Graphene Nanoribbons (A-GNR) was theoretically studied using Non Equilibrium Green Function (NEGF) formalism to determine Device Density of States (DDOS), Electrostatic Effective Potential (EDP), Conductivity (G) and Current-Voltage (I-V) characteristics. This paper analyzed the performance of semiconducting graphene nanoribbon (N=10), metallic graphene nanoribbon (N=11) and cascade hetero-graphene nanoribbon to consider the effect of H2O adsorption on GNR and conclude that for low voltage application semiconducting A-GNR will be a better choice over metallic A-GNR and cascade A-GNR. The optimum area for adsorbing maximum number of H2O molecules on A-GNR has been studied. It has been observed that the increment of quasi conductance resulting sensing performance for limited number of H2O adsorption. To overcome this problem, a new device model has been proposed.