Paper-based Volatile Organic Compound Sensor using MultiWalled Carbon Nanotubes on a Polytetrafluoroethylene Membrane
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Abstract
In this research, a paper-based volatile organic compound (VOC) sensor using multiwalled carbon nanotubes (CNTs) on a polytetrafluoroethylene (PTFE) membrane was successfully fabricated. The optimum of CNT amount and the responses to VOC vapors were investigated. Firstly, CNTs were functionalized with oxygen-containing function groups by oxygen plasma for 30 min, followed by dispersing the functionalized CNTs in ethanol with a concentration of 0.01 mg/mL. Finally, the paper-based sensor was fabricated by vacuum filtration of CNT suspension. The amounts of CNTs on a membrane were controlled by the volume of the CNT suspension in the range of 20 – 40 mL. The film resistance decreased with a volume of CNT suspension. The CNT sensor formed from 30 mL of CNT suspension exhibited the optimum amount of CNT for VOC sensing. Moreover, the paper-based sensor shows the highest response to methanol and the lowest response to benzene. Such a different sensitivity is essentially due to the different polarities of VOC molecules. These results imply a potential use of CNT on a paper as a low-cost, flexible, portable and disposable VOC sensor.
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