An Investigation of Ac Impedance and Dielectric Spectroscopic Properties of Conducting Chitosan-silane Crosslinked-poly (Vinyl Alcohol) Blended Films

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.

Investigation of Temperature- and Frequency- Dependent Dielectric Study of LiNi0.3Co0.3Mn0.3O2 and LiNi0.3Co0.3Mn0.3Ba0.1O2 for Cathode Materials

“…The frequency hopping was observed to shift toward higher-frequency regions with the increase in the temperature. At each temperature run, there were two regions with respect to frequency dependency: a frequency-independent region that was followed by a frequency-dependent region, concluding that our conductivity graphs obeyed Jonscher’s universal power law. , …”

“…At each temperature run, there were two regions with respect to frequency dependency: a frequency-independent region that was followed by a frequency-dependent region, concluding that our conductivity graphs obeyed Jonscher's universal power law. 32,36 A s…”

Novel Maleic Acid, Crosslinked, Nanofibrous Chitosan/Poly (Vinylpyrrolidone) Membranes for Reverse Osmosis Desalination

“…The infrared spectra of NF-TFC membranes were studied in the range of 4000–500 cm −1 as shown in Figure 1 . The FTIR spectra shows bands at 893 and 1155 cm −1 , and confirmed the pyranose ring and saccharine structure of chitosan [ 22 , 23 ]. The bands at 1653 cm −1 and 1322 cm −1 exhibited the characteristics of chitin and chitosan, respectively, and are reported as amide I and amide III peaks, respectively.…”

Effect of SWCNT Filler on Mechanical Properties and Electrical Conductivity of PVA/CS/GA/SWCNT Nanocomposite Thin Film

“…3A represents the FTIR spectra of PVA/CS/GA and PVA/CS/GA/SWCNT. In PVA/CS/GA spectrum, the absorption peak at 3200-3600 cm -1 indicates the overlaps between symmetric -NH and stretching -OH vibrations from intramolecular and intermolecular hydrogen bonds in PVA/CS/GA [23], while the peak at 2919 cm -1 typically corresponds to the vibration of C-H stretching. The evidence of chemically crosslinking between CS and GA is characterized by absorption bands at 1660 cm -1 and 1550 cm -1 which refer to imine (-C=N-) and amine (NH2) groups, respectively [24].…”