All-carbon fiber-based chemical sensor: Improved reversible NO2 reaction kinetics
- All-carbon fiber-based chemical sensor: Improved reversible NO2 reaction kinetics
- 정현수; 이동명; 유하영; 최선진; 장지수; 김민혁; 강준영; 김일두
- Issue Date
- Sensors and actuators. B, Chemical
- VOL 290-301
- 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.
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