Synthesis, conductivity and dielectric characterization of salicylic acid–Fe3O4 nanocomposite

• Published in: Materials chemistry and physics Vol. 123; no. 1; pp. 184 - 190
• Main Authors: Unal, B., Durmus, Z., Kavas, H., Baykal, A., Toprak, M.S.
• Format: Journal Article
• Language: English
• Published: 01-09-2010
• Subjects: Chemical engineering; Chemical process and manufacturing engineering; Dielectric constant; Dielectric properties; Kemisk process- och produktionsteknik; Kemiteknik; Materialkemi; Materials chemistry; Nanocomposites; Nanomaterials; Nanoparticles; Nanostructure; Nanostructures; Permittivity; Powder diffraction; Precipitation; Salicylic acid; Semiconductors; Synthesis; TECHNOLOGY; TEKNIKVETENSKAP
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2010.03.080

We report on the synthesis of water dispersible salicylic acid -Fe3O4 nanocomposites via a co-precipitation route by using Fe(III) and Fe(II) chloride salts, and salicylic acid. Crystalline phase was identified as Fe3O4 and the crystallite size was obtained as 13A plus or minus 6nm from X-ray line profile fitting. As compared to the particle size of 20nm obtained from TEM analysis these particles show polycrystalline nature. The capping of salicylic acid around Fe3O4 nanoparticles was confirmed by FTIR spectroscopy, the interaction being via bridging oxygens of the carboxylate and the nanoparticle surface. ac and dc conductivity measurements performed on the nanocomposite revealed semiconductor characteristics and varying trends with temperature due to reorganization of the nanocomposite. Permittivity measurements showed increasing dielectric constant with increasing temperature as expected from semiconductors. Analysis of electrical modulus and dielectric permittivity functions suggest that ionic and polymer segmental motions are strongly coupled in the nanocomposite.