Magnetic and transport behavior of Fe 2O 3/polypyrrole nanocomposites
The effect of iron oxide nanoparticles on the physicochemical properties of polypyrrole (PPy) was investigated. Discrete nanoparticles were observed as compared with the network structure of the PPy synthesized without iron oxide nanoparticles. The electrical conductivity of the nanocomposites was observed to increase dramatically after the initial addition of nanoparticles due to the crystallinity and more condensed structure of the PPy. However, the higher nanoparticle loading was observed to decrease the conductivity due to the dominating 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 the acidic reactant. A tight polymer structure surrounds the magnetic nanoparticles, as compared to a complete loss of the magnetic nanoparticles during conventional mechanical stirring for the microparticle filled PPy composite fabrication.
Publication Source (Journal or Book title)
American Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation
Guo, Z., Shin, K., Karki, A., Young, D., Kaner, R., & Hahn, H. (2007). Magnetic and transport behavior of Fe 2O 3/polypyrrole nanocomposites. American Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation, 3, 1624-1638. Retrieved from https://digitalcommons.lsu.edu/physics_astronomy_pubs/5944