Humidity sensor using surface adsorbed channel modulated Graphene nanoribbon: NEGF approach

Electronic transport properties of Graphene nanoribbon (GNR) are explored by self-consistent numerical simulation. The effects of vapour (H₂O) adsorption in GNR sheets on its current-voltage (I-V) characteristics, conductivity, electrostatic difference potential and device density of states were studied with necessary physical insight. We found that conductivity of GNR sheet increases in some particular energy range with the increase in number of H₂O molecules adsorbed. Then we encounter the effects of metal-GNR contact to investigate the practical performance of GNR as a medium of humidity sensing. Later we propose a simple schematic model for GNR Humidity Sensor (GNRHS) to investigate its performance in applied regime.