Journal
SYNTHETIC METALS
Volume 158, Issue 6, Pages 251-258Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2008.01.012
Keywords
polyaniline; nanocomposites; TiO2; carbon nanotube; conductivity; microwave absorption property
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As nanomaterial possessing moderate conductivity, magnetic and dielectric property, novel hexanoic acid (HA)-doped polyaniline (PAni) nanocomposites containing TiO2 nanoparticles (dielectric filler) and carbon nanotubes, CNTs (magnetic fillers such as single-walled carbon nanotube, SWNT and multi-walled carbon nanotube, MWNT) were prepared by template free method. The PAni were characterized by UV, FTIR, X-ray diffraction (XRD), thermogravimetric (TGA) and scanning electron microscopy (SEM) analyses. Conductivity, magnetization, dielectric and microwave absorption properties of PAni were also investigated. The resulted nanorods/tubes as shown in SEM images clearly show that polymerization is proceeded in micelle/water interface through elongation. During template free method, TiO2 and CNT exist in the center of Ani/HA micelle. The SEM images show that some of the CNT enwrapped with PAni layer indicate CNT are just packed underneath the PAni and never attacked by PAni. PAni/HA/TiO2/SVVNT with 20% of SWNT exhibits the best microwave absorption property (similar to 99.2% absorption) with reflection loss of -21.7 dB at 6 GHz due to its moderate conductivity (1.27 S/cm), magnetization (M-s = 1.01 emu/g), highest tan 3 and heterogeneity. (C) 2008 Elsevier B.V. All rights reserved.
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