Abstract
Poly(aniline co-pyrrole) (PAP), polyaniline (PAN) and polypyrrole (PPY) nanostructures were fabricated by template less chemical oxidative polymerization of aniline and pyrrole at low temperature and evaluated as chemiresistive ammonia sensor. The structural analysis was done by Fourier transform infrared spectroscopy (FTIR), which confirms the formation of respective polymers whereas, field effect scanning electron microscopy (FE-SEM) revealed the formation of PAP nanospeheres with diameter around 100nm, PAN nanofibres with diameter around 50nm and PPY nanospheres with diameter around 500nm. It is observed that PAP sensors showed excellent sensing towards low concentration (10ppm) of ammonia, as compared to its homopolymers based sensors at room temperature. PAP sensor was found to be reliable in terms of low cost, recovery time, selectivity, reproducibility, detection range and stability.
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