Abstract
Flexible gas sensors have been widely used in environmental and human health monitoring due to their flexibility and compatibility with electronic device substrates. Herein, we prepared a porous polypropylene/carbon nanotube/polyaniline (p-PP/CNT/PANI) nanocomposite gas sensor using disposable surgical masks as a flexible substrate. The CNT aqueous solution with a surfactant was drop-coated on the porous polypropylene fibers (p-PP) of the mask, followed by in-situ polymerization of aniline on the p-PP/CNT composite. The fabricated flexible p-PP/CNT/PANI gas sensor exhibited fast response (93 s) and recovery times (36 s), low detection limit (500 ppb), high response value (452% towards 70 ppm NH3), and good stability at room temperature. The excellent sensing performance was mainly attributed to the p-PP/CNT/PANI network with a higher specific surface area and their conductive channels. Moreover, the composite sensor in a disposal mask can detect breathing patterns in real-time for potential noninvasive monitoring of respiratory rate.
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