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Dielectric Property and Conductivity Study of Polyaniline – CaF2 Nanocomposites |
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PP: 9-17 |
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Author(s) |
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Sohan M. Chauhan,
Jayveer Mahida,
B. S. Chakrabarty,
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Abstract |
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| Polyaniline – CaF2 nanocomposite samples were synthesized by a combination of precipitation synthesis of CaF2 nanocrystals and in – situ polymerization of aniline. Structural characteristics were investigated by XRD and FTIR spectroscopy. Optical properties were measured by UV – Visible spectroscopy. Conduction studies were done by using four – probe method. Dielectric measurements were done in the frequency range of 100 Hz – 1000 KHz at room temperature. XRD results show that the samples are crystalline in nature. It indicates the formation of cubic phase of CaF2.The crystallite size of composite samples decrease with increase in the concentration of CaF2 nanocrystals. FTIR spectroscopy shows the presence of different functional groups. UV – Visible spectrum of the samples show a strong absorption edge at 331 nm and 664 nm and a decrease in band gap with increase in precursor concentration. Electrical conductivity study shows decrease in the conductivity of the samples with an increase in the concentration of CaF2. Dielectric measurements show that dielectric constant decreases with increase in the frequency. The highest value of dielectric constant at 100 Hz is 71415.18 and 25577.14 in the case of pure Polyaniline and Polyaniline – CaF2 (20 wt %) respectively. |
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