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

Electrodeposition of Polypyrrole Films: Influence of Fe3O4 Nanoparticles and Platinum Co-Deposition

“…When the spherical structure of PPy-Fe 3 O 4 nanocomposites was formed, the characteristic peak assigned to the polaron-p transition was slightly shifted to a smaller wavelength with increasing Fe 3 O 4 , suggesting the interaction between the quinoid rings of PPy and Fe 3 O 4 . This is also consistent with the results observed for us by Raman spectroscopy in a recent study (Montoya et al, 2010) and also with the fact that magnetite preserves the PPy film to further oxidation and the PPyFe 3 O 4 could preserve the conductive state for longer time due to the stabilization of the polaronic form of the oxidized state.…”

“…Some works have reported composite films obtained by galvanostatic method on several substrates as: iron, stainless steel, carbon steel, platinum, etc. (Garcia et al, 2002;Montoya et al, 2010;Wencheng and Iroh, 1998). Instead, other electrochemical techniques as constant or variable electric potential have been imposed in order to synthesize the composite coatings.…”

“…A recent study examined the effect of the magnetite particles on the structure of the polymer matrix. Films of polypyrrole were synthesized on stainless steel in the presence of magnetite particles (Montoya et al, 2010). The effect of the magnetite particles on the structure of the polymer matrix was determined using Raman spectroscopy and Scanning Electron Microscopy (SEM).…”

“…A novel strategy have been reported to improve its properties and extend the application range of these materials, this is the incorporation of inorganic particles of metallic oxides such as MnO 2 , V 2 O 5 , TiO 2 , Fe 2 O 3 , Fe 3 O 4 and WO 3 or metallic particles of Zn, Cu, Au, Pt into the conductive polymer (Demets et al, 2000;Ferreira et al, 2001;Kawai et al, 1990;Kuwabata et al, 2000;Lenz et al, 2003;Montoya et al, 2010;Vishnuvardhan et al, 2006). For example we have recently demonstrated that the incorporation of magnetite into polypyrrole (PPy) decreases the electric resistance of the polymeric film and not only stabilize the polaronic form of the polypyrrole, but also preserve the polymer from further oxidation (Montoya et al, 2010). Polypyrrole (PPy) exhibits interesting properties such as high conductivity, relatively good environmental stability, and wide technological applications.…”

Influence of the Incorporation of CeO2 Nanoparticles on the Ion Exchange Behavior of Dodecylsulfate Doped Polypyrrole Films: Ac-Electrogravimetry Investigations

“…In particular, among other parameters, increased nanoparticle loading was also shown to improve the electrical conductivity, dielectric permittivity, and thermal stability of the resulting nanocomposites [7]. One should also notice that magnetite incorporation stabilizes the polaronic form of polypyrrole matrices and also preserves it from further oxidation [8] or allows production of unexpected 1 µm wide stripe-like microstructures resulting from the self-assembly of magnetic components [9].…”