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High Efficiency Crumpled Carbon Nanotube Heaters for Low Drift Hydrogen Sensing

Title
High Efficiency Crumpled Carbon Nanotube Heaters for Low Drift Hydrogen Sensing
Authors
Park, JeonhyeongJang, Il RyuLee, KyungtaekKim, Hoe Joon
DGIST Authors
Kim, Hoe Joon
Issue Date
2019-10
Citation
Sensors, 19(18)
Type
Article
Article Type
Article
Author Keywords
carbon nanotubescrumpled CNTsjoule heatinghydrogen sensinggas sensing
Keywords
GAS SENSORSTHIN-FILMSAUSENSITIVITYSHEET
ISSN
1424-8220
Abstract
This work presents the fabrication of crumpled carbon nanotubes (C-CNTs) thin film heaters and their application towards high sensitivity and low drift hydrogen gas sensing. Utilizing a spray coating of pristine multi-walled carbon nanotubes (MWCNTs) and thermal shrinkage of polystyrene (PS) substrate, we have fabricated C-CNTs with closely packed junctions. Joule heating of C-CNTs gives higher temperature at a given input voltage compared to as-deposited CNTs. In addition, temperature coefficient of resistance (TCR) is analyzed for accurate temperature control and measurement of the heater. The C-CNT heaters are capable of hydrogen gas sensing while demonstrating higher measurement sensitivities along with lower drift compared to as-deposited CNT devices. In addition, the self-heating of C-CNT heaters help rapid desorption of hydrogen, and thus allowing repetitive and stable sensor operation. Our findings reveal that both CNT morphologies and heating temperatures affect the hydrogen sensing performances.
URI
http://hdl.handle.net/20.500.11750/10840
DOI
10.3390/s19183878
Publisher
MDPI AG
Related Researcher
  • Author Kim, Hoe Joon Nano Materials and Devices Lab
  • Research Interests MEMS/NEMS; Micro/Nano Sensors; Piezoelectric Devices; Nanomaterials; Heat Transfer; Atomic Force Microscope
Files:
Collection:
Department of Robotics EngineeringNano Materials and Devices Lab1. Journal Articles


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