Open AccessAn Efficient and Novel Ammonia Sensor Based on Polypyrrole/Tin Oxide/MWCNT Nanocomposite
Author(s) -
Ahmad Husain,
M. Shariq,
Anees Ahmad
Publication year - 2020
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2020.22648
Subject(s) - polypyrrole , nanocomposite , scanning electron microscope , transmission electron microscopy , chemistry , ammonia , chemical engineering , conductive polymer , tin oxide , conductivity , analytical chemistry (journal) , oxide , materials science , nanotechnology , polymer , composite material , organic chemistry , polymerization , engineering
In present study, the synthesis and characterization of a novel polypyrrole (PPy)/tin oxide(SnO2)/MWCNT nanocomposite along with pristine polypyrrole is reported. These materials havebeen studied for their structural and morphological properties by FT-IR spectroscopy, X-ray diffraction(XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques.PPy/SnO2/MWCNT nanocomposite has been converted into a pellet-shaped sensor, and its ammoniasensing studies were carried out by calculating the variation in the DC electrical conductivity at differentconcentration of ammonia ranging from 10 to 1500 ppm. The sensing response of the sensor wasdetermined at 1500, 1000, 500, 200, 100 and 10 ppm and found to be 70.4, 66.1, 62.2, 55.4, 50.8 and39.7%, respectively The sensor showed a complete reversibility at lower concentrations along withexcellent selectivity and stability. Finally, a sensing mechanism was also proposed involving polarons(charge carriers) of polypyrrole and lone pairs of ammonia molecules