Electrical and magnetic properties of the composite pellets containing DBSA-doped polyaniline and Fe nanoparticles

• Published in: Synthetic metals Vol. 156; no. 11; pp. 833 - 837
• Main Authors: Xue, Wenyan, Qiu, Hong, Fang, Kun, Li, Jing, Zhao, Jingwei, Li, Mei
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.06.2006; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Composite; Composites; Conductivity; DBSA-doped polyaniline; Exact sciences and technology; Fe nanoparticles; Forms of application and semi-finished materials; Magnetization; Polymer industry, paints, wood; Technology of polymers; Conductivity; Composite; Magnetization; DBSA-doped polyaniline; Fe nanoparticles; Electrical conductivity; Electrical properties; Temperature effect; Iron; Experimental study; Composite particles; Metal particle; Sulfonic acid; Conducting polymers; Magnetization curve; Magnetic particles; Concentration effect; Doped polymer; Magnetic properties; Saturation magnetization; Aniline polymer
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2006.05.002

DBSA-doped polyaniline powder (DBSA-PANI) was mixed with Fe nanoparticles to obtain the DBSA-PANI-Fe composite. Powder of the composite was compacted to the pellets to study the electrical property and magnetization characteristic by measuring the conductivity in 100–300 K and the magnetization curve at room temperature. The conductivity of the composite pellet is linearly decreased from 0.25 ± 0.02 to 0.07 ± 0.01 S/cm with increasing the Fe nanoparticle content from 0 to 70 wt.%. For the pellets containing the Fe nanoparticles less than 70 wt.%, the variation of conductivity with temperature reveals that the charge transport mechanism can be considered to be one-dimensional variable-range-hopping (1D-VRH). For the pellet with 70 wt.%-Fe nanoparticles, however, the charge transport mechanism cannot be well understood in terms of the VRH model. All the DBSA-PANI-Fe composite pellets show a magnetic hysteresis loop and a hard magnetization characteristic. The saturation magnetization monotonously increases from 32 to 78 emu/g with increasing the Fe nanoparticle content from 30 to 70 wt.%. The saturation field and the coercivity are estimated to be about 5500 and 385 Oe, respectively, independent of the Fe nanoparticle content.