[show abstract][hide abstract] ABSTRACT: The effect of iron oxide nanoparticle addition on the physicochemical properties of the polypyrrole (PPy) was investigated.
In the presence of iron oxide nanoparticles, PPy was observed in the form of discrete nanoparticles, not the usual network
structure. PPy showed crystalline structure in the nanocomposites and pure PPy formed without iron oxide nanoparticles. PPy
exhibited amorphous structure and nanoparticles were completely etched away in the nanocomposites formed with mechanical stirring
over a 7-h reaction. The thermal stability of the PPy in the nanocomposites was enhanced under the thermo-gravimetric analysis
(TGA). The electrical conductivity of the nanocomposites increased greatly upon the initial addition (20wt%) of iron oxide
nanoparticles. However, a higher nanoparticle loading (50wt%) decreased the conductivity as a result of the dominance of
the insulating iron oxide nanoparticles. Standard four-probe measurements indicated a three-dimensional variable-range-hopping
conductivity mechanism. The magnetic properties of the fabricated nanocomposites were dependent on the particle loading. Ultrasonic
stirring was observed to have a favorable effect on the protection of iron oxide nanoparticles from dissolution in acid. A
tight polymer structure surrounds the magnetic nanoparticles, as compared to a complete loss of the magnetic iron oxide nanoparticles
during conventional mechanical stirring for the micron-sized iron oxide particles filled PPy composite fabrication.
Journal of Nanoparticle Research 04/2012; 11(6):1441-1452. · 2.18 Impact Factor