Anomalous behaviour of the electrical properties for PVA/TiO 2 nanocomposite polymeric films
- PDF / 2,229,781 Bytes
- 15 Pages / 439.37 x 666.142 pts Page_size
- 59 Downloads / 193 Views
Anomalous behaviour of the electrical properties for PVA/ TiO2 nanocomposite polymeric films Yasmin Khairy1 · H. I. Elsaeedy2 · M. I. Mohammed3 · H. Y. Zahran2,3 · I. S. Yahia2,3 Received: 1 June 2019 / Revised: 17 November 2019 / Accepted: 20 November 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract In the present study, the fabricated nanocomposites were prepared by the casting technique by adding titanium dioxide (TiO2) to polyvinyl alcohol (PVA) with different weight percentages (0.037, 0.185, 0.370, 1.852, 3.704 and 37.037 wt%). SEM micrographs declared that PVA polymer matrix contains a distributed set of cluster of TiO2 nanoparticles. AC electrical characteristics and dielectric relaxation of nanocomposite polymeric films in the frequency range 100 kHz–1 MHz were presented as temperature changes from 303 to 413 K. The results indicated that the dielectric performance and electrical properties of the nanocomposites differ anomalously with increasing TiO2 nanoparticles content. It was demonstrated that there is a stronger temperature-reliance of the dielectric properties of the 1.852 wt% of TiO2/PVA nanocomposite polymeric film. Moreover, there is an interfacial polarization effect, which obeys Arrhenius behaviour that increased nonlinearly with increasing temperature at a fixed frequency. The electrical relaxation dynamics containing dielectric was examined. The dielectric properties were investigated through the electric modulus. Keywords PVA–TiO2 nanocomposites · SEM morphology · Dielectric properties · AC electrical conductivity
* Yasmin Khairy [email protected]; [email protected] 1
Physics Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
2
Advanced Functional Materials and Optoelectronic Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
3
Nanoscience Laboratory for Environmental and Bio‑Medical Applications (NLEBA), Semiconductor Laboratory, Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt
13
Vol.:(0123456789)
Polymer Bulletin
Introduction Over the recent years, polymeric nanocomposites based on ceramic metal oxide have been shown great interest among the scientific community because of their outstanding achievement in electronic properties [1, 2] such as batteries, solar cells, sensors, supercapacitors and fuel cells. Ceramic materials are generally brittle and very hard to process [3]. Otherwise, polymer materials at low temperatures are flexible, easy to process and display very high dielectric breakdown [4]. Electrical properties such as conductivity, dielectric constant and dielectric loss can be improved by mixing polymers with ceramic nanomaterials in the composite structure. Titanium dioxide ( TiO2) is a transition metal oxide with three distinct crystallization structures such as rutile, anatase and brookite that can be used in many studies because of its excellent optical and electronic properties [5, 6].
Data Loading...
