Chemical synthesis, characterization, and direct‐current conductivity studies of polypyrrole/γ‐Fe₂O₃ composites

Abstract

ABSTRACT:The in situ polymerization of pyrrole was carried out in the presence of g-Fe 2 O 3 to synthesize polypyrrole/gFe 2 O 3 composites by a chemical oxidation method. The polypyrrole/g-Fe 2 O 3 composites were synthesized with various compositions, including 10, 20, 30, 40, and 50 wt % g-Fe 2 O 3 in pyrrole. The polypyrrole/g-Fe 2 O 3 composites were characterized with X-ray diffractometry and infrared spectroscopy. The surface morphology of these composites was studied with scanning electron microscopy. The direct-current conductivity was studied from 40 to 2008C. The dimensions of the g-Fe 2 O 3 particles in the matrix had a greater influence on the conductivity values.

Evidence of redox interactions between polypyrrole and Fe3O4 in polypyrrole–Fe3O4 composite films

“…This behavior has also been found by other researchers in PPy-iron oxides composites. Murugendrappa and Ambika [27] observed that the values of the conductivity increase up to 40 wt% ␥-Fe 2 O 3 in PPy and decrease thereafter. According to these authors, this may be due to the extended chain length of PPy, which facilitates the hopping of charge carriers when the concentration of ␥-Fe 2 O 3 is as high as 40%.…”

Ac Conductivity and Dielectric Studies of Polypyrrole Copper Zinc Iron Oxide Nanocomposites

“…The pellets of the synthesized composites are coated with silver paste on either side of the surfaces to obtain better contacts for conductivity measurements [8].…”

Conducting Polymers and Their Applications to Biosensors: Emphasizing on Foodborne Pathogen Detection

“…In polyacetylene, anions and cations are produced during charge transfer. Most practical types of Polypyrrole have conductivities in the range of 1-100 S/cm [9]. The structure of polypyrrole is shown in Fig.…”

“…Moreover, the relative stability is increased due to efficient bonding of biomolecule on the transducer surface which improves reproducibility. These materials are especially important because of their bridging role between the world of conducting polymers and that of nanoparticles [9]. The promising features of conducting polymer nanocomposites are also discussed in literature [10]- [15].…”