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Title: DC conductivity studies of doped polyaniline tungsten oxide nanocomposites
Authors: Sastry, D Nagesa
Revanasiddappa, M
Basavaraja, C
Suresh, T
Raghavendra, S C
Keywords: Doped polyaniline;Tungsten oxide;DC conductivity;Positive temperature coefficient
Issue Date: Oct-2013
Publisher: NISCAIR-CSIR, India
Abstract: Camphor sulfonic acid (CSA) doped polyaniline (PANI) and tungsten oxide (WO3) composites (PANI/CSA/WO3) have been prepared by in situ deposition technique by placing different wt% of fine grade nano powder of WO3(PANI/CSA/WO­3 -10, -20, -30, -40 and -50%) during polymerization of polyaniline. The polymerization of aniline is carried by using ammonium peroxydisulfate as oxidizing agent. The composites are characterized by various physical methods such as Fourier transform infrared spectra (FTIR), X-ray diffractogram (XRD), thermo-gravimetric analysis (TGA), scanning electron micrograph (SEM) and transmission electron micrographs (TEM). The FTIR spectral data shows the homogeneous distribution of WO3 nano particles in PANI/CSA polymer matrix. The TGA reveals that PANI interacted strongly with the WO3-SO3H, enhancing the thermal stability of polyaniline. The SEM images indicate that increase of WO3 wt% in PANI/CSA/WO3 composites, enhances the compactness of the matrix. The TEM image clearly shows the size distribution of WO3 nanoparticles formed during the reaction and ranges from 150 to 200 nm. The temperature dependent DC conductivity of PANI/CSA/WO3 composites is studied in the temperature range 308-433 K. The results of PANI/CSA/WO3 indicate strong interaction of PANI/CSA with WO3 in the composites. The study of DC conductivity shows an evidence for the transport properties of the composites. Due to the positive temperature coefficient of resistance of WO3, these composites can signify in development of new materials in temperature dependent applications.
Page(s): 435-442
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.20(5) [October 2013]

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