We report a flexible and room temperature ammonia sensor
based
on polypyrrole/functionalized multiwalled carbon nanotubes (Ppy/f-MWCNTs).
This nanocomposite has been synthesized by the in-situ chemical oxidative
polymerization method and finally loaded on a transparent poly(vinylidene
fluoride) (PVDF) membrane substrate. The entire flexible sensor fabrication
process was cost-effective and easy to operate, making it ideal for
commercial production on a wide scale. The optimized Ppy/f-MWCNT-based
flexible sensor demonstrates improved sensing characteristics (26.5%
for 100 ppm) with a low response time of 16 s and high response toward
ammonia compared with pristine Ppy. In addition, high repeatability
and long-term stability were also observed over a concentration range
of 5–200 ppm. It shows high response toward ammonia among various
gaseous analytes. Furthermore, the flexible sensor was mechanically
robust and could produce a high response value even in extreme bending
conditions. The flexible Ppy/f-MWCNT-based flexible sensors offer
potential applications in advanced wearable devices to detect ammonia
in the ambient environment.
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