Dielectric and optical properties of PVA/PAN doped TiO 2 NPs
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Dielectric and optical properties of PVA/PAN doped TiO2 NPs T. A. Abdel‑Baset1,2 Received: 26 March 2020 / Revised: 16 July 2020 / Accepted: 3 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Titanium dioxide nanoparticles ( TiO2 NPs) were prepared by sol–gel method. The effect of T iO2 NPs on structure, dielectric and optical properties of PVA/PAN films was reported. The X-ray diffraction (XRD) and high resolution scanning electron microscopy (HR-SEM) it were used to characterize the prepared samples. The XRD result shows the phase formation of TiO2 as anatase, with average crystal size of about 50 nm. PVA/PAN-TiO2 nanocomposite films have an amorphous nature. In addition, the dielectric constant ε′, the electric modulus M″ and the ac conductivity (σac) were studied also. It was found that ε′ increases with temperature, dielectric relaxation observed by electric modulus M″, which may be associated with MicroBrownian motion of the main PVA/PAN chains. The ac conductivity supports hopping mechanism for the nanocomposite films. The optical investigations show that, increasing TiO2 content of the samples results in a decrease of the optical band gap accompanied with an increase of the refractive index and electric susceptibility of the nanocomposite films
1 Introduction Polyvinyl alcohol (PVA) is a semicrystalline polymer which has been extensively used due to its unique properties like a non-toxicity, low cost, high dielectric strength, good transparency, processability, biocompatibility, good chemical resistance, hydrophilicity, biodegradability and excellent solubility in water [1–3]. PVA consists of hydroxyl groups which are considered as sources for hydrogen bonds which simplify the preparation of PVA based nanocomposites. PVA is an excellent charge storing capacity, good thermal, chemical, mechanical stability and high dielectric strength. PVA was used in many different applications like artificial biomedical devices, electronic devices, membrane applications, electrochromic devices, paper coating, packaging and textile applications [4, 5]. Polymers blend is economical and an alternate process for gain composites for a various application with new physical and chemical properties [6–8]. Poly-acrylonitrile (PAN) is regarded the most preferable precursor material for the production of high strength, high modulus carbon fibers. It has a different physical properties * T. A. Abdel‑Baset [email protected]; [email protected] 1
Department of Physics, Faculty of Science, Taibah University, Yanbu 46423, Saudi Arabia
Department of Physics, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
2
good resistance [9], thermal stability [10], and mechanical strength [11]. PAN is completely non-toxic and suitable for biomedical applications [12, 13]. The dielectric properties of the compound depend on the host polymer dielectric constants and the inorganic filling. The Addition of nanoparticles improves the performance of polymeric materials. Many types o
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