Abstract
The films of chitosan (CS)-silane crosslinked-poly(vinyl alcohol) (PVA) with different weight % were prepared. The effect on conductivity of CS/PVA blended films due to change in the concentration of PVA and temperature was investigated by impedance spectroscopy and showed good conductance properties. The complex impedance plots revealed single semicircular arcs indicating the bulk contribution to overall electrical behavior of all synthesized samples. The ac conductivity obeyed the Jonscher's power law for all samples in the frequency range of 2 kHz to 2 MHz. The ionic conductivity of the films was increased with the increase in temperature for all synthesized samples which showed an increase in the number of effective charge carriers while it was decreased at a specific higher temperature for each film. The observed activation energy for CP4, CP8 and CP10 were 0.431, 0.610 and 0.425 eV, respectively. These properties showed that the films were promising materials to be employed for conducting properties.
Highlights
Biopolymer electrolytes have potential applications in electrochemical devices such as electrode coatings, fuel cells, biosensors, bioelectrodes, rechargeable batteries, super capacitors, biopolymer membranes[1,2,3,4,5,6] and turn out to be an interesting, cost effective and attractive devices
The Fourier Transform Infrared spectroscopic (FTIR) spectra of the blends membranes with chitosan and poly(vinyl alcohol) (PVA) are shown in Figure 1 which shows bands at 893 and 1155 cm–1 confirmed the presence of pyranose ring and saccharine structure of chitosan[11,27,29]
The effect of increase in PVA amount and elevated temperature on AC electrical properties of CS-silane crosslinked-PVA blend crosslinked by TEOS was studied
Summary
Biopolymer electrolytes have potential applications in electrochemical devices such as electrode coatings, fuel cells, biosensors, bioelectrodes, rechargeable batteries, super capacitors, biopolymer membranes[1,2,3,4,5,6] and turn out to be an interesting, cost effective and attractive devices. The inherent structure, morphology, biocompatibility and biodegradability of biopolymers make them discrete in these applications These electrochemical devices have high selectivity and ionic conductivity, acid, base and solvent resistance, excellent contact between synthetic and biological systems, pH sensitive and good mechanical properties[1,2,7]. Chitosan (poly-β(1,4)-D-glucosamine) is an abundant, naturally occurring cationic biopolymer with reactive hydroxyl and amino group and has many electrical, chemical, and biological properties[8,9,10,11] It has been used extensively for biomedical applications like drug delivery systems, tissue engineering, separation membranes, and artificial corneas, adhesives etc.[12,13,14,15]. PVA has non-polar carbon backbone and polar hydroxyl group and have good ionic
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