The effect of the oxidant-to-monomer (O/M) molar ratio on the morphological, magnetic, optical, and surface potential performance of polypyrrole nanofibers (PPy NFs) has been studied. PPy NFs were prepared by chemical polymerization of pyrrole at 5 ˚C, then the structure of nanofibers with various diameters was determined by field-emission scanning electron microscopy (FESEM). X-ray diffraction analysis and energy-dispersive x-ray spectroscopy were used to determine the composition of the PPy NFs in the prepared nanostructures. The magnetic hysteresis loop of PPy NFs showed soft ferromagnetic behavior. The surface potential of PPyNFs was measured by Kelvin probe force microscopy, revealing that the sample with a MO:Py: FeCl3 molar ratio equal to 1: 5.6: 4 showed excellent surface potential behavior. The H2S gas sensing performance of the PPy NFs thin films with each molar ratio was also tested, revealing an enhancement with increasing oxidant concentration.
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