Journal of Nanoscience and Nanoengineering
Articles Information
Journal of Nanoscience and Nanoengineering, Vol.1, No.2, Aug. 2015, Pub. Date: Aug. 7, 2015
Simulation of Graphene Nanoribbon Based Gas Sensor
Pages: 66-73 Views: 1466 Downloads: 1246
Authors
[01] G. R. Ahmed Jamal, Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh.
[02] Mokter M. Chowdhury, Department of Electrical and Electronic Engineering, Bangaldesh University of Engineering and Technology, Dhaka, Bangladesh.
[03] Fahrin Rahman, Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh.
[04] M. Aminur Rahman, Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh.
[05] Sharika Shabnaz, Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh.
[06] Umma Habiba, Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh.
Abstract
Potential of Graphene nanoribbon (GNR) as a gas sensor is investigated in this work through a simulation based on semi empirical computations. The interactions between GNR (both pristine and defective) and three gas molecules (Ammonia, Mithane and Water) are deeply studied. A summary of some recent studies is presented so as to show that all GNRs, especially all sub-10 nm GNRs, exhibit semiconducting behavior with finite bandgap which is good to be used as a sensor. A sub-10 nm armchair-edged GNR is selected here to be used as sensing element for these three gases. All three gas molecules showed much stronger adsorption on the defective GNR than that on the pristine GNR. The change in density of state DOS diagram of pristine GNR before and after contacting gas molecules was found to be almost negligible near Fermi level. Change in GNR band feature due to donor type gas molecules was observed to be completely opposite of that for acceptor type gas molecules. The simulation result was compared with previous theoretical and experimental works so as to confirm that the observations from this work are consistent with relevant earlier works. Effect of distance and number of interacting gas molecules on Density of states of GNR was also shown. This work reveals that GNR can be a better sensor than graphene and the sensitivity of GNR-based chemical gas sensors could be drastically improved by introducing the appropriate defect.
Keywords
Graphene, GNR, Armchair, Adsorption, Gas Molecule, Density of States
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