Impact of nano-perovskite La2CuO4 on dc-conduction, opto-electrical sensing and thermal behavior of PVA nanocomposite films. Issue 5 (23rd March 2020)

• Record Type: Journal Article
• Authors: Al-Gunaid, Murad Q.A.; Saeed, Adel M. N.; H.M, Gayitri; Basavarajaiah, Siddaramaiah
• Is Part Of: Polymer-plastics technology and materials. Volume 59:Issue 5(2020)
• Page Start: 469
• Page End: 483
• Publication Date: 2020-03-23
• Subjects: Perovskite La2CuO4 -- scherrer length -- I-V mechanism -- relaxation time -- Tauc's gap; Polymers -- Periodicals; Polymerization -- Periodicals; Plastics -- Periodicals; Plastics; Polymerization; Polymers; Periodicals; 668
• DOI: 10.1080/25740881.2019.1669646
• Languages: English
• ISSNs: 2574-0881

Abstract

ABSTRACT: Nanocomposite (NC) films of poly vinyl alcohol (PVA) incorporated with varying amounts of perovskite lanthanum cuprate (La2 CuO4 ) nanoparticles (NPs) have been fabricated by solution intercalation technique. TEM result showed the size of NPs between 91-134nm. The effects of NPs content on structural and morphological behaviors of PVA have been established by XRD, FTIR and SEM methods. Electrical properties of NC films were performed using LCR-meter. Current (I)–voltage (V) data displayed dc-conductivity increased with increasing NPs content and trends of I–V indicate the dominant Ohmic behavior at voltage <5V and above that Poole–Frenkel emission is the dominant conduction mechanism. Ac-conductivity increases with increase in frequency and dosage of NPs. The maximum ac-conductivity obtained in this investigation is 2.43X10 −5 S/cm for PVA/2wt% La2 CuO4 with lowest activation energy of 0.147 eV at 25 ° C. Cyclic voltammetry (CV) revealed the specific capacitance of PVA-NC improved compared to pristine PVA. The reduction in Tg with increment NPs contents was observed. The optical behaviors of NCs were deduced by UV-visible spectroscopy where the result showed band gap energy was reduced from 5.23eV to 3.25eV whereas refractive index increased from 1.71 to 2.44 for pure PVA and PVA/2wt%La2 CuO4, respectively. Graphical abstract: