All-carbon fiber-based chemical sensor: Improved reversible NO2 reaction kinetics

Title
All-carbon fiber-based chemical sensor: Improved reversible NO2 reaction kinetics
Authors
정현수이동명유하영최선진장지수김민혁강준영김일두
Issue Date
2019-07
Publisher
Sensors and actuators. B, Chemical
Citation
VOL 290-301
Abstract
All-carbon fiber-based chemiresistor is fabricated by assembling reduced graphene oxide (RGO) fiber and carbon nanotube (CNT) fiber as reversible NO2 sensing layer and flexible heater, respectively. Both graphene oxide (GO) and CNT fibers were synthesized by wet-spinning technique facilitating lyotropic nematic liquid crystal (LC) property. Randomly entangled CNT fiber-based heater, which is embedded in one surface of colorless polyimide (cPI) film with thickness of ˜ 200  μm, exhibits high bending stability and heating property up to 100  °C. Single reduced graphene oxide (RGO) fiber obtained after heat treatment at 900  °C in H2/N2 ambient was integrated on the CNT fiber-embedded cPI heater, thereby establishing a new type of all-carbon fiber sensing platform. As a result, accelerated NO2 adsorption and desorption kinetics were achieved with RGO fiber at an elevated temperature. In particular, a 9.22-fold enhancement in desorption kinetic (kdes  =  8.85  ×  10– 3 s– 1) was observed at 100  °C compared with the desorption kinetic (kdes  0.96  1) at 50  °C, which was attributed to the effective heating by CNT fiber networks. This work pioneered a research on the use of emerging carbonaceous fibers for potential application in wearable chemical detectors.
URI
http://pubs.kist.re.kr/handle/201004/69232
ISSN
0925-4005
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KIST Publication > Article
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