Abstract
In this work, we have prepared polyvinyl alcohol (PVA) coated multiwall carbon nanotube (MWCNT) film by an in situ chemical oxidative preparation technique. The thermogravimetric analysis clearly explains the thermal degradation of pure polymer and polymer nanocomposite film. We have studied the AC electrical transport properties and current–voltage (I–V) characteristic of PVA–MWCNT composites within the temperature range 300 ≤ T ≤ 423 K and frequency range 150 Hz ≤ f ≤ 2 MHz. It is observed that the dielectric constant of the composite film increases significantly. The frequency variation of AC conductivity follows the power law (\( \omega^{S} \)) and a sharp transition from small polaron tunneling to correlated barrier hopping model is found. The imaginary part of electric modulus shows non-Debye type asymmetric behaviour. The impedance spectroscopy shows the negative temperature coefficient of resistance of the composite film. Nyquist plot of the composite film at different temperatures is established from impedance measurement. The current–voltage characteristic (under ± 20 V) shows hysteresis behaviour and field dependent resistance. We simulate the experimentally observed current density–electric field data with the established theory.
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Acknowledgements
The authors thank to the CSIR (Project No. 03/1278/13/EMR-II), Govt. of India for financial support during this work.
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Das, A.K., Meikap, A.K. Current–voltage hysteresis and dielectric properties of PVA coated MWCNT film. Indian J Phys 92, 685–693 (2018). https://doi.org/10.1007/s12648-017-1148-2
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DOI: https://doi.org/10.1007/s12648-017-1148-2
Keywords
- Polymer nanocomposites
- Optical properties
- AC conductivity
- Dielectric response
- Current–voltage characteristics