Effect of PANI rate percentage on morphology, structure and charge transport mechanism in PANI–PVDF composites above percolation threshold
| Autor: | Hassen Derouiche, Sami Saïdi, Fethi Gmati, Abdellatif Belhadj Mohamed, Aymen Mannaî, Mouna Bouzitoun |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Scanning electron microscope Percolation threshold Atmospheric temperature range Conductivity Condensed Matter Physics Electric charge Variable-range hopping Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrical resistivity and conductivity Fourier transform infrared spectroscopy Composite material |
| Zdroj: | Journal of Physics D: Applied Physics. 46:355101 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | Polyaniline–Poly(vinylidene) fluoride (PANI–PVDF) composites were prepared by adding PANI to the PVDF by different weight percentages p % (p = 0, 5, 10, 20, ... until 100%). The dc and ac electrical conductivity were studied as a function of PANI percentage in the temperature range 303–453 K. The percolation threshold was found to be equal to 2.95%. When the amount of PANI varies from 5 to 30%, the charge transport mechanism was found to be governed by Mott's three-dimensional variable range hopping model and the dc conductivity decreases within this range. For p > 30%, the conductivity increases and the charge transport mechanism are better fitted by a fluctuation induced tunnelling model (FIT). By calculating the distance 's' between two successive clusters (the distance between two active imines centres (=N+H–) of PANI) from the FIT model, we deduce that electron charge transfer is done by inter-chain hopping for the range [p = 40 to 60%] and by intra-chain hopping for p = 70 to 90%. Some insights about the contribution of the ionic charge transport for PANI concentrations in the interval 5% < p < 30% were obtained using impedance measurements at different frequencies. X-ray diffraction measurements, Fourier transform infrared spectroscopy and scanning electron microscopy were used to investigate the effect of PANI on the structure and morphology of composites. |
| Databáze: | OpenAIRE |
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