Optical and dielectric properties of ZnO‐PVA nanocomposites

Abstract

Nanocomposites of polyvinyl alcohol and ZnO were prepared using the solution casting method. ZnO nanoparticles with hexagonal wurtzite structure and mean sizes of 59, 82 and 150 nm were prepared by thermal decomposition of zinc acetate dihydrate. The synthesized crystals were characterized by X‐ray diffraction (XRD), and scanning electron microscopy (SEM). Optical properties of the nanocomposites were determined using UV–visible absorption spectroscopy. The results showed that all samples appeared near band edge absorption close to the bulk value. Furthermore, broadband dielectric spectroscopy, at ambient temperature, was employed in order to investigate the effect of mean particle size upon interfacial relaxation phenomena. Dielectric data provide evidence that interfacial polarization, which is present in all three nanocomposite films, shifts to higher frequencies and its intensity is decreasing as the mean nanoparticle diameter is also decreasing. Finally, exploiting the Cole–Davidson approach, becomes evident, that interfacial polarization process acquires a more symmetric form, tending to a pure Debye relaxation. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Anomalous Peak in the Forward-Bias C–V Plot and Temperature-Dependent Behavior of Au/PVA (Ni,Zn-doped)/n-Si(111) Structures

“…8 PVA is an important water-soluble polymer and is widely used in synthetic fiber, paper, textile, coating, and binding industries because of its excellent chemical and physical properties, nontoxicity, processability, good chemical resistance, wide range of crystallinity, good film-formation capacity, complete biodegrability, high crystal modulus, etc. [7][8][9] PVA is normally a poor electrical conductor but can become conductive upon blending and doping with some polymer dopants. 10 When a polymer is doped, the dopant can induce modifications in the molecular structure as well as in the microstructural properties of the polymer.…”

“…[3][4][5][6][7] Also, many physicists and chemists have devoted their efforts to studying and improving the electrical properties of polymers doped with metal ions. 8,9 Over recent years, polyvinyl alcohol (PVA) has been extensively researched by chemists, physicists, and electrical engineers alike, owing to its potential applications and interesting properties. 8 PVA is an important water-soluble polymer and is widely used in synthetic fiber, paper, textile, coating, and binding industries because of its excellent chemical and physical properties, nontoxicity, processability, good chemical resistance, wide range of crystallinity, good film-formation capacity, complete biodegrability, high crystal modulus, etc.…”

Hybrid Pva-In2o3 Nano Thin Film for Transparent Optical Devices

“…Among hybrid materials, the polymer and inorganic oxide based thin films attracted the attention of researchers mainly because of their interesting physical and chemical properties [1][2][3][4]. It offers great prospects for the most efficient and cost effective utilization of a wide variety of applications.…”

Preparation and dielectric properties of polyvinyl alcohol (Co, Zn Acetate) Fiber/n-Si and polyvinyl alcohol (Ni, Zn Acetate)/n-Si Schottky diodes

“…They are expected to play an important role as both interconnects and functional components in the fabrication of nanoscale electronic and optoelectronic devices [1]. Polymer based nanocomposites is a subject of considerable research because of their ability to combine the advantages of both polymers and filler components [2]. There are several applications of polymeric nanocomposites based on their optical, electrical, mechanical and magnetic properties [3][4][5][6][7][8].…”