Investigation of triplex CaAl(2)ZnO(5)nanocrystals on electrical permittivity, optical and structural characteristics of PVA nanocomposite films

Gayitri, H. M. and AL-Gunaid, Murad and Siddaramaiah and Gnana Prakash, A. P. (2020) Investigation of triplex CaAl(2)ZnO(5)nanocrystals on electrical permittivity, optical and structural characteristics of PVA nanocomposite films. Polymer Bulletin, 77 (9). pp. 5005-5026. ISSN 1436-2449

Text Gayitri2020_Article_InvestigationOfTriplexCaAl2ZnO (1).pdf - Published Version Restricted to Repository staff only Download (4MB) | Request a copy

Abstract

Nanocomposite (NC) films of polyvinyl alcohol (PVA)/calcium aluminum-doped zincate (CaAl2ZnO5) have been fabricated with varying amounts, namely 2, 4, 6 and 8 wt% of CaAl(2)ZnO(5)nanoparticles (NPs) by solution casting technique. TEM data showed that an average particle size of CaAl(2)ZnO(5)NPs is \~ 25 nm. The effect of CaAl(2)ZnO(5)content on structural and morphological behaviors has been established by Fourier-transform infrared spectroscopy and scanning electron microscopy, respectively. The photo-response of NCs was derived by UV-visible spectroscopy where the band gap energy (E-g) reduced from 5.25 eV for PVA to 2.82 eV for PVA/8 wt% CaAl2ZnO5NC film. The dielectric permittivity and current-voltage (I-V) characteristics were studied using LCR-meter in frequency range of 50 Hz-5000 kHz. The relative dielectric constant (epsilon `) was increased from 15 to 65 with increase in NPs content from 0 to 8 wt%. The PVA NC with 8 wt% CaAl(2)ZnO(5)NPs raises the ac conductivity to 3.35 x 10(-5) S cm(-1)at room temperature. The cyclic voltammetry (CV) tests have been performed to calculate the specific capacitance of the NCs as a positive electrode against Ag/AgCl as reference electrode. The specific capacitance increases from 1. Fg(-1)for PVA to 3.69 Fg(-1)for PVA/8 wt% CaAl2ZnO5NC. These behaviors will support the possible applications in optical display devices and micro-electrical and electronic applications

Item Type:	Article
Uncontrolled Keywords:	CaAl(2)ZnO(5)NPs; Band gap; Dispersion energy; Dielectric permittivity; Specific capacitance
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	Mr Umendra uom
Date Deposited:	05 Mar 2021 06:32
Last Modified:	05 Mar 2021 06:32
URI:	http://eprints.uni-mysore.ac.in/id/eprint/15525

Actions (login required)

View Item