Dielectric Properties and AC Conductivity of Chitosan-La 2 O 3 Nanocomposite
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RESEARCH ARTICLE-PHYSICS
Dielectric Properties and AC Conductivity of Chitosan-La2 O3 Nanocomposite Ali H. Bashal1 · Mohammed Khalafalla2 · T. A. Abdel-Basset2,3 Received: 12 May 2020 / Accepted: 17 September 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract In this study, polymeric films based on chitosan (CS) doped with Lanthanum oxide nanoparticles at different weight percentages (5, 10, 15, and 20% La2 O3 /CS) were prepared using the simple solution cast transformation. The dielectric constant increases with increasing the La2 O3 content, and this could be attributed to the induced defects, as a result more dipoles are produced in the polymer matrix. Also, the values of Z and Z increase with La contents. On other hand, we noticed that the plot of the normalized-imaginary electric modulus versus the frequency shows a clear peak at high frequency for all samples. This peak is associated with ionic conduction. The AC conductivity increased by increasing the La2 O3 content. Furthermore, AC conductivity increases with frequency because the absorbed energy from the electric field can increase the number of charge carriers that are participating in the electric conduction. Moreover, the values of the universal exponents were larger than the unity and increase with increasing temperatures which means that the conduction process may be pertinent to reorientational (or localized) mechanism. Keywords Chitosan · La2 O3 · Nanocomposite film · Dielectric properties · AC conductivity
1 Introduction The synthesis of polymer-metal nanostructured materials is becoming an interesting field of research with great impact on the science and technology of materials at the nanoscale [1]. The addition of metal nanoparticles into a polymer matrix is regarded as a feasible means to manipulate and improve the polymer’s optical, catalytic, and electronic characteristics. On the other hand, the internal structure of host polymers can provide an environment for the in situ synthesis and preparation of nanoparticles with different morpholo-
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T. A. Abdel-Basset [email protected] Ali H. Bashal [email protected] Mohammed Khalafalla [email protected]
1
Department of Chemistry, Faculty of Science, Taibah University, Yanbu 46423, Saudi Arabia
2
Department of Physics, Faculty of Science, Taibah University, Yanbu 46423, Saudi Arabia
3
Department of Physics, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
gies [2]. Biopolymers, polysaccharide [3–6], and chitosan ([7, 8]) are among the examples of polymers that are used for controlling the synthesis of metal-based nanoparticles. In addition, nanocomposites for various technical purposes can be obtained by the choosing polymers with desirable photoluminescence and conductivity ([9, 10]). Recently, biopolymers have emerged as functional materials for research and industry due to their effective cost, and attractive environmental and ecological impacts. These polymers have intrinsic biological characteristics which make them suitable for various appli
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