Journal
PHYSICA B-CONDENSED MATTER
Volume 406, Issue 5, Pages 1114-1120Publisher
ELSEVIER
DOI: 10.1016/j.physb.2010.12.059
Keywords
Nanomaterials; Dielectric properties; Spinel structure; AC/DC conductivity; Mn3O4
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Funding
- Fatih University
- Research Project Foundation [P50020803-2]
- Turkish Ministry of Industry
- TUBITAK [1101487]
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Polyaniline (PANI)-Mn3O4 nanocomposite was synthesized by a combination of sonochemical synthesis of Mn3O4 NP's and in-situ polymerization of aniline. Structural characteristics were evaluated by XRD, FT-IR, TGA, VSM, TEM and SEM analysis, and conduction characteristics were evaluated by total conductivity measurements in the temperature range of 20-100 degrees C and frequency range of 0.1 Hz-1 MHz. Our findings show that PANI is successfully coated on nanoparticles surface and overall conductivity of nanocomposite is approximately 50-1000 times higher than that of uncapped Mn3O4 or PANI base with increase in temperature. Morphology of the synthesized powder was observed to be thin nanosheets with a thickness of 2-3 nm based on SEM analysis. Room temperature magnetization curves for nanocomposite show no hysteresis, indicating the super-paramagnetic character of the sample in the region of measured field strength. sigma(AC) increased after polyaniline coating. (C) 2011 Elsevier B.V. All rights reserved.
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