Over the past years, carbon-based materials and especially graphene, have always been known as one of the most famous and popular materials for sensing applications. Graphene poses outstanding electrical and physical properties that make it favorable to be used as a transducer in the gas sensors structure. Graphene experiences remarkable changes in its physical and electrical properties when exposed to various gas molecules. Therefore, in this study, a set of new analytical models are developed to investigate energy band structure, the density of states (DOS), the velocity of charged carriers and I-V characteristics of the graphene after molecular (CO, NO2, H2O) adsorption. The results show that gas adsorption modulates the energy band structure of the graphene that leads to the variation of the energy bandgap, thus the DOS changes. Consequently, graphene converts to semiconducting material, which affects the graphene conductivity and together with the DOS variation, modulate velocity and I-V characteristics of the graphene. These parameters are important factors that can be implemented as sensing parameters and can be used to analyze and develop new sensors based on graphene material.

Department for Management of Science and Technology Development Ton Duc Thang University Ho Chi Minh City 758307 Vietnam

Faculty of Computing and Information Technology in Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia

Faculty of Electrical and Electronics Engineering Ton Duc Thang University Ho Chi Minh City 758307 Vietnam

Institute for Nanomaterials Advanced Technologies and Innovation Technical University of Liberec Studentska 2 461 17 Liberec Czech Republic

School of Electrical Engineering Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia

UTM MIMOS Center of Excellence in Telecommunication Technology School of Electrical Engineering Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia

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