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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, Jeonhyeong; Jang, Il Ryu; Lee, Kyungtaek; Kim, Hoe Joon
- DGIST Authors
- Kim, Hoe Joon
- Issue Date
- 2019-09
- Citation
- Sensors, 19(18)
- Type
- Article
- Article Type
- Article
- Author Keywords
- carbon nanotubes; crumpled CNTs; joule heating; hydrogen sensing; gas sensing
- Keywords
- GAS SENSORS; THIN-FILMS; AU; SENSITIVITY; SHEET
- 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
-
-
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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