Universiti Teknologi Malaysia Institutional Repository

A carrier velocity model for electrical detection of gas molecules

Pourasl, Ali Hosseingholi and Syed Ariffin, Sharifah Hafizah and Ahmadi, Mohammad Taghi and Ismail, Razali and Gharaei, Niayesh (2019) A carrier velocity model for electrical detection of gas molecules. Beilstein Journal of Nanotechnology, 10 . pp. 644-653. ISSN 2190-4286


Official URL: http://dx.doi.org/10.3762/BJNANO.10.64


Nanomaterial-based sensors with high sensitivity, fast response and recovery time, large detection range, and high chemical stability are in immense demand for the detection of hazardous gas molecules. Graphene nanoribbons (GNRs) which have exceptional electrical, physical, and chemical properties can fulfil all of these requirements. The detection of gas molecules using gas sensors, particularly in medical diagnostics and safety applications, is receiving particularly high demand. GNRs exhibit remarkable changes in their electrical characteristics when exposed to different gases through molecular adsorption. In this paper, the adsorption effects of the target gas molecules (CO and NO) on the electrical properties of the armchair graphene nanoribbon (AGNR)-based sensor are analytically modelled. Thus, the energy dispersion relation of AGNR is developed considering the molecular adsorption effect using a tight binding (TB) method. The carrier velocity is calculated based on the density of states (DOS) and carrier concentration (n) to obtain I-V characteristics and to monitor its variation in the presence of the gas molecules. Furthermore, the I-V characteristics and energy band structure of the AGNR sensor are simulated using first principle calculations to investigate the gas adsorption effects on these properties. To ensure the accuracy of the proposed model, the I-V characteristics of the AGNR sensor that are simulated based both on the proposed model and first principles calculations are compared, and an acceptable agreement is achieved.

Item Type:Article
Uncontrolled Keywords:armchair graphene nanoribbons, carrier velocity, gas sensor
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:88793
Deposited By: Yanti Mohd Shah
Deposited On:29 Dec 2020 12:25
Last Modified:29 Dec 2020 12:25

Repository Staff Only: item control page