Effect of MWCNT addition on the optical band gap of PVA/CS transient biocomposites

Abstract

In recent years, as a result of increasing environmental concerns, biodegradable materials have gained great attention. With the rapid development of electronic technology, the importance of innovation and development of low-cost, sustainable, transient bioelectronics materials is increasing. In this research, the preparation of Poly(Vinyl Alcohol) (PVA), Chitosan (CS), and Multi-Walled Carbon nanotube (MWCNT) biocomposite films have been described. The solution mixing, ultrasonic mixing, and spin coating techniques were used to prepare the PVA/CS/MWCNT biocomposite thin films. UV–Vis absorption spectroscopy and two-point probe resistivity measurement techniques were used to study the optical and electrical properties of the biocomposite thin films. Optical band gap energies ( Eg) of PVA/CS/MWCNT biocomposites were obtained using the Tauc and Absorbance Spectrum Fitting (ASF) methods. Results obtained with both methods were found to be exactly the same. Experimental results have shown that with increasing MWCNT concentration, electrical conductivity (σ) increases from 1.75x10−16 S to 2.94x10−3 S, and Eg decreases significantly. At the same time, the fundamental optical parameters such as band tail (Urbach) energy ( Eu), refractive index ( n), absorption ( α), and extinction ( k) coefficient of the PVA/CS/MWCNT biocomposites were investigated in the UV-VIS range. The improvement observed in the optical and electrical properties of PVA/CS/MWCNT biocomposite films shows that these composites could be used as bioelectronics materials.

Improvement of optical, dielectric and mechanical properties of a new nanocomposite based on polyvinyl alcohol and layered double hydroxide

“…Poly (vinyl alcohol) polymer used in this work has been the subject of several investigations: Choudhary et al 14 reported improved dielectric properties of a polyvinyl alcohol/polyethylene oxide (PVA/PEG) composite upon reinforcement with graphene oxide. Mergen et al 15 developed the optical properties of PVA, Chitosan (CS), and Multi-Walled Carbon nanotube (MWCNT) biocomposite films. Abdallh et al 16 improve that the optical band gap and optical activation energy have been investigated for pure and doped PVA films with different cupper chloride concentrations.…”

Optical and Dielectric Features of PVA/CMC/PVP/ZnMn2O4/CuCo2O4/x wt% MWCNTs Blended Polymers for Optoelectronic Applications

“…These properties make MWCNTs an ideal material for creating an appropriate holding medium for various dopants, as well as for use in energy storage systems. [12][13][14] Researchers have widely utilized multi-walled carbon nanotubes (MWCNTs) owing to their low price, lack of toxicity, and widespread availability. By combining MWCNTs with other transition metal nano-oxides or nano-sulfides, it is possible to create a nanohybrid material with exceptional characteristics and a typically stable structure.…”

“…By combining MWCNTs with other transition metal nano-oxides or nano-sulfides, it is possible to create a nanohybrid material with exceptional characteristics and a typically stable structure. 15 The impact of multi-walled carbon nanotubes (MWCNTs) on the optical characteristics of polyvinyl alcohol/ chitosan nanocomposites was investigated by Mergen et al 13 for potential use in biological applications. Altalhi et al created blends with polyaniline (PANI), MWCNTs and zinc sulphide (ZnS) nanoparticles for the purpose of using them in biofuel uses.…”

Influence of Zinc Manganite Nano Fillers on the Optical and Dielectric Features of Poly-Methyl Methacrylate/Multi-Walled Carbon Nanotubes Nanocomposites

“…27 Mergen et al investigated the influence of MWCNTs on the optical characteristics of PVA/CS nanocomposites, specifically for bio-applications. 28 Blends created for polyaniline, ZnS and MWCNT nanoparticles were prepared by Altalhi et al 29 for use in biofuel applications. To facilitate rapid charging and discharging, Yin et al 30 created a novel MWCNT-and copper nanowire-based 3D nanocomposite anode.…”