Sensors, Vol. 19, Pages 3878: High Efficiency Crumpled Carbon Nanotube Heaters for Low Drift Hydrogen Sensing

Sensors, Vol. 19, Pages 3878: High Efficiency Crumpled Carbon Nanotube Heaters for Low Drift Hydrogen Sensing Sensors doi: 10.3390/s19183878 Authors: Jeonhyeong Park Il Ryu Jang Kyungtaek Lee Hoe Joon Kim 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.
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research