Simulations of Benzene and Hydrogen-Sulfide Gas Detector Based on Single-Walled Carbon Nanotube over Intrinsic 4H-SiC Substrate

Carbon nanotubes (CNTs)-based sensors have gained significant importance due to their tremendous electrical and physical attributes. CNT-based gas sensors have high sensitivity, stability, and fast response time compared to that of solid-state sensors. On exposure to a large variety of organic and i...

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Bibliographic Details
Published in:Micromachines (Basel) 2020-04, Vol.11 (5), p.453
Main Authors: Rashid, Muhammad Haroon, Koel, Ants, Rang, Toomas, Ziko, Mehadi Hasan
Format: Article
Language:English
Subjects:
Benzene
Carbon
carbon nanotube
Chromatography
detector
Electric currents
Electrical resistivity
Electrodes
Gas detectors
Gas sensors
Gases
Hydrocarbons
Hydrogen
hydrogen sulfide
Inorganic compounds
Medical equipment
Nanomaterials
photocurrent
Photoelectric effect
Photoelectric emission
Process controls
Response time
Selectivity
sensor
Simulation
Single wall carbon nanotubes
Software packages
Substrates
Target detection
Toolkits
User interface
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Summary:Carbon nanotubes (CNTs)-based sensors have gained significant importance due to their tremendous electrical and physical attributes. CNT-based gas sensors have high sensitivity, stability, and fast response time compared to that of solid-state sensors. On exposure to a large variety of organic and inorganic compounds, the conductivity of CNT changes. This change in electrical conductivity is being used as a detection signal to detect different target molecules. Hydrogen-sulfide and benzene are hazardous gases that can cause serious health issues in humans. Therefore, it is mandatory to detect their presence in industrial and household environments. In this article, we simulated CNT-based benzene and hydrogen-sulfide sensor with a nanoscale semiconductor device simulator-Quantumwise Atomistix Toolkit (ATK). The change in the device density of states, electric current, and photocurrent in the presence of target molecules have been calculated. The change in photocurrent in the presence of target molecules has been proposed as a novel detection mechanism to improve the sensor selectivity and accuracy. This change in photocurrent as well as electric current in the presence of target molecules can be used simultaneously as detection signals. Our intension in the future is to physically fabricate this simulated device and use photocurrent as well as electric current as detection mechanisms.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi11050453