Microwave absorption behavior of a polyaniline magnetic composite in the X-band

• Published in: Physica. B, Condensed matter Vol. 407; no. 16; pp. 3168 - 3171
• Main Authors: Aphesteguy, J.C., Damiani, A., DiGiovanni, D., Jacobo, S.E.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.08.2012; Elsevier
• Subjects: Condensed matter; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conducting polyaniline; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic Nanocomposites; Magnetic properties and materials; Materials science; Microwave absorption; Microwave and radio-frequency interactions (excluding resonances); Microwaves; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other interactions of matter with particles and radiation; Physics; Polyanilines; Scanning electron microscopy; Small particles and nanoscale materials; SQUIDs; Studies of specific magnetic materials; Superconducting quantum interference devices; X-band; Conducting polyaniline; Magnetic Nanocomposites; Microwave absorption; Scanning electron microscopy; Inorganic compounds; Iron oxide; Transition element compounds; Magnetic field effects; Epoxy resin; XRD; Thickness; Nanoparticles; Magnetite; Composite materials; Transmission electron microscopy; SQUID magnetometers; Magnetic materials; Polyanilines
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2011.12.055

The development of nanosized materials is a subject of considerable interest both for understanding of the fundamental properties of magnetic materials for new technological applications. Polyaniline, composites Fe3O4/(PANI) with conducting, magnetic and electromagnetic properties with different amounts of Fe3O4 were successfully prepared. The samples were structurally characterized by scanning electron microscopy (SEM), X-ray diffraction and transmission electron microscopy (TEM) and magnetically, with a superconducting quantum interference device (SQUID) magnetometer. In order to explore microwave-absorbing properties in X-band, the composite nanoparticles were mixed with an epoxy resin to be converted into a microwave-absorbing composite. Microwave behavior with different Fe3O4/(PANI)-epoxy resin ratio was studied using a microwave vector network analyzer (VNA) in the range 7.5 to 13GHz. For a constant thickness of 1.5mm, absorption increases with the magnetite contents in the composites and in the oriented samples by the application of a magnetic field.