Hybrid GO/TiO₂ nanoparticles reinforced NaAlg/PVA blend: Nanocomposites for high‐performance energy storage devices

Abstract

In this study, novel flexible polymer nanocomposite films formed of polyvinyl alcohol (PVA), sodium alginate (NaAlg), titanium dioxide (TiO2) and graphene oxide (GO) as nanofiller are fabricated by using casting method. The PVA/NaAlg‐GO/TiO2 nanocomposite films are characterized using various techniques. The synergistic effects of GO/TiO2 on the electrical, dielectric properties, and the energy density efficiency of PVA/NaAlg blend have been investigated in the range of frequency from 10 Hz to 7 MHz. The XRD data showed that the intensity of the PVA/NaAlg‐GO/TiO2 nanocomposites films decrease with nanofiller concentration. The FTIR spectroscopy provides proof that the complex formed. The optical studies were carried out using UV–Vis. spectroscopy. The energy bandgap values of PVA/NaAlg‐GO/TiO2 nanocomposite films were calculated using Tauc's plot. It is shown that the host matrix's Eg value decreases from 4.97 to 4.29 eV for direct transitions and from 4.37 to 2.29 eV for indirect transitions. The electrical and dielectric parameters of the nanocomposites showed that the maximum electrical properties were observed for the composite with 8 wt% loading of GO/TiO2. The σdc increased from 2.45 × 10−9 to 5.02 × 10−7 S cm−1. In addition, frequency exponent S decreased from 0.82 to 0.54. These findings demonstrated that there are significant modifications in the fabricated samples, which open the road for utilizing the PVA/NaAlg‐GO/TiO2 nanocomposite as flexible films for solar cells and electrical energy storage applications.

Facile design of a low-cost laser CUT-OFF filter with PMMA polymer nanocomposite doped with Mg0.5Ni0.5Fe2O4: structural, optical, and dielectric properties

“…This results in an increase in AC conductivity due to the enhanced hopping frequency [27,52]. The values of Ac conductivity are comparable with the previous work [68][69][70][71].…”

Synthesis and characterization of PEG/CS‐AgNO3 polymer nanocomposites for flexible optoelectronic and energy storage applications

“…These flaws result in localized conditions that show an increase in the level of disorder in films 31 . According to a report, changes to the electrical structure could have an impact on PNCs' optical characteristics 32 . The XRD results (Figure 1) clearly demonstrate that the PNCs films have developed disorder.…”

“…31 According to a report, changes to the electrical structure could have an impact on PNCs' optical characteristics. 32 The XRD results (Figure 1) clearly demonstrate that the PNCs films have developed disorder. The observed decrease in the direct and indirect energy bandgaps (Eg) with rising AgNO 3 nanoparticles is a result of the complex interplay between the concentration of nanoparticles, the creation of new energy levels, increased disorder, and the interactions between the polymer matrix and AgNO 3 nanoparticles.…”

Fabrication and Characterization of Silver Nanoparticle-Doped Chitosan/Carboxymethyl Cellulose Nanocomposites for Optoelectronic and Biological Applications

“…The first region, known as the dispersion zone, is situated in the lower frequency range. In this region, ions have adequate time to accumulate on the electrode surface, resulting in lower conductivity levels at these frequencies . In contrast, the higher frequency zone appears relatively flat, suggesting that conductivity remains largely unaffected by increasing frequency.…”

“…In this region, ions have adequate time to accumulate on the electrode surface, resulting in lower conductivity levels at these frequencies. 41 In contrast, the higher frequency zone appears relatively flat, suggesting that conductivity remains largely unaffected by increasing frequency. The quantity of Ag NPs also influenced the spacing between localized states within the mixture, which, in turn, affected the potential barriers separating them.…”