Magnetic field sensor based on a maghemite/polyaniline hybrid material

• Published in: Journal of materials science Vol. 45; no. 18; pp. 5012 - 5021
• Main Authors: de Souza, Fernando Gomes, Marins, Jéssica Alves, Pinto, José Carlos, de Oliveira, Geiza Esperandio, Rodrigues, Cezar Manzini, Lima, Luis Mauricio T. R.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.09.2010; Springer; Springer Nature B.V
• Subjects: Aqueous solutions; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Electrical conductivity; Electrical resistivity; Icam 2009; Iron oxides; Magnetic fields; Magnetism; Magnetization; Materials Science; Particle size; Polyanilines; Polymer Sciences; Polymerization; Powders; Resistivity; Sensors; Sodium dodecylbenzenesulfonate; Solid Mechanics; Electrical Resistivity; Polyaniline; Hybrid Material; Magnetic Force; Maghemite
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-010-4321-y

A hybrid material containing maghemite and polyaniline (PAni) doped with dodecylbenzenesulfonic acid (DBSA) was prepared through in situ polymerization in aqueous medium. The pure maghemite powder presented average particle diameter of 10 nm and magnetization force of 14 mN. The obtained maghemite/PAni hybrid material also presented nanometric dimensions, associated with reasonable electrical conductivity (260 times larger than the electrical conductivity of the pure maghemite) and about 60% of the original magnetic force. Additionally, the electrical conductivity of the hybrid powder showed significant sensitivity to changes of the magnetic field, indicating that these materials can be useful as magnetic field sensors.