Fast Nitrogen Dioxide Sensing with Ultralow‐Power Nanotube Gas Sensors
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Date
2024-01
Publication Type
Journal Article
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yes
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Abstract
The study reports fast, ultralow-power operation of carbon nanotube-based nitrogen dioxide (NO₂) sensors enabled by nanotube self-heating and transient sensing. The self-heating effect in the nanotube channel significantly accelerates the desorption of gas molecules, reducing the sensor recovery time to a minute. As gas molecules re-adsorb on the nanotube after cooling, the initial rate of the sensor transient is used to determine NO₂ concentration within a few minutes. To accelerate and optimize the operation of the sensor, the study considered temperature profiles along the self-heated carbon nanotube, their effect on different sensing regions, and a physical model-based fit. As a result, the nanotube-based NO₂ sensor demonstrates recovery and readout times below 5 min and an extrapolated limit of detection below 10 ppb. The peak power consumption of this operation mode is below 6 μW. The combination of fast readout, fast recovery, low limit of detection, and ultralow power consumption demonstrated in this work shows strong promise of carbon nanotube-based NO₂ sensors in mobile or Internet-of-Things (IoT) applications.
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Publication status
published
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Journal / series
Volume
3 (1)
Pages / Article No.
2300081
Publisher
Wiley-VCH
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Date collected
Date created
Subject
carbon nanotube; nitrogen dioxide (NO2); sensor recovery; transient sensing; ultralow-power
Organisational unit
03609 - Hierold, Christofer / Hierold, Christofer
Notes
Funding
170224 - FRICTIONLESS ENERGY EFFICIENT CONVERGENT WEARABLES FOR HEALTHCARE AND LIFESTYLE APPLICATIONS (SNF)
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