Abstract
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.
Highlights
Electronics and sensors are required to provide valuable advantages for humanity in different vital areas such as life sciences, health care, and security
Basedtoonthethe results, was shown that energy dispersion relation of the graphene varies when exposed results, it was shown that the energy dispersion relation of the graphene varies when exposed to the gas molecules
density of states (DOS) in after molecular adsorption of the gasesmodel were was monitored
Summary
Electronics and sensors are required to provide valuable advantages for humanity in different vital areas such as life sciences, health care, and security. Electrical sensors are electronic devices capable of detecting physical quantities in their environment and convert them into measurable electrical signals that can be displayed by the monitor [1,2,3]. Sensors can be designed, fabricated, and employed for various applications subject to the physical quantity to be measured [4,5,6,7,8]. Sensors can measure specific changes in the properties of different materials such as liquids and gases. One of the most important applications of sensors is the detection of specific gases [9,10,11].
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