Synthesis and characteristics of poly(3-pyrrol-1-ylpropanoic acid) (PPyAA)-Fe(3)O(4) nanocomposite
2011 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 509, no 33, 8460-8468 p.Article in journal (Refereed) Published
Poly(3-pyrrol-1-ylpropanoic acid) (PPyAA)-Fe(3)O(4) nanocomposite was successfully synthesized by an in situ polymerization of 1-(2-carboxyethyl) pyrrole in the presence of synthesized Fe(3)O(4) nanoparticles. Evaluation of structural, morphological, electrical and magnetic properties of the nanocomposite was performed by XRD, FT-IR, TEM, TGA, magnetization and conductivity measurements, respectively. XRD analysis reveals the inorganic phase as Fe(3)O(4) and TGA shows about 90 wt% loading of Fe(3)O(4) in the nanocomposite. FT-IR analysis indicates a successful conjugation of Fe(3)O(4) particles with polypyrrole acetic acid. Magnetization measurements show that polypyrrole acetic acid coating decreases the saturation magnetization of Fe(3)O(4) significantly. This reduction has been explained by the pinning of the surface spins by the possible adsorption of non-magnetic ions during the polymerization process. The conductivity and dielectric permittivity measurements strongly depend on the thermally activated polarization mechanism and thermal transition of PPyAA in the nanocomposite structure. Large value of dielectric permittivity (epsilon') of the nanocomposite at lower frequency is attributed to the predominance of species like Fe(2+) ions and grain boundary defects (interfacial polarization).
Place, publisher, year, edition, pages
2011. Vol. 509, no 33, 8460-8468 p.
Conducting polymer, Fe(3)O(4), Nanocomposite, Magnetization, Dielectric properties, a.c./d.c. conductivity
IdentifiersURN: urn:nbn:se:kth:diva-37140DOI: 10.1016/j.jallcom.2011.06.002ISI: 000292746100035ScopusID: 2-s2.0-79960846407OAI: oai:DiVA.org:kth-37140DiVA: diva2:432344