Structural, optical, electrical properties, and relative humidity sensor application of PVA/Dextrin polymeric blend loaded with silicon dioxide nanoparticles

In the current study, polymer composite films (PCFs) of polyvinyl alcohol (PVA) and Dextrin (60/40) wt% without and with 0.03 and 0.06 wt% silicon dioxide nanoparticles (SiO 2 NPs) were synthesized via casting way. The structural properties of the matrix polymer blend (MPB) were investigated using X...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-08, Vol.33 (23), p.18199-18208
Main Author: Abdali, Karar
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dextrin
Electrical properties
Electrical resistivity
Energy dissipation
Energy gap
Functional groups
Humidity
Materials Science
Nanoparticles
Optical and Electronic Materials
Optical microscopes
Optical properties
Polymer blends
Polymer films
Polymer matrix composites
Polymers
Polyvinyl alcohol
Relative humidity
Silica
Silicon dioxide
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Summary:In the current study, polymer composite films (PCFs) of polyvinyl alcohol (PVA) and Dextrin (60/40) wt% without and with 0.03 and 0.06 wt% silicon dioxide nanoparticles (SiO 2 NPs) were synthesized via casting way. The structural properties of the matrix polymer blend (MPB) were investigated using X-ray diffraction and revealed an amorphous structure. However, some kind of crystallinity has appeared after embedding the SiO 2 NPs. The chemical functional groups were analyzed via FTIR spectra. The surface morphology characteristics were performed utilizing an optical microscope (OPM), and the images showed that SiO 2 NPs were well diffused in MPB without any agglomerations. The optical properties were studied in the wavelength range between 190 and 1100 nm. Up to 97% of UV rays were blocked by PCFs at λ  = 270 nm and the absorption edges decreased from 4.05 to 3.80 eV. The values of the allowed and forbidden energy gap ( E g ) decreased from 4.18 to 3.75 eV and from 3.98 to 3.73 eV, respectively, with the existence of the NPs. In addition, the electrical conductivity ( σ ac ) values were increased with the increase in frequency f and NPs content. The use of SiO2NPs has shown highly improved dielectric and energy dissipation characteristics and has a high sensitivity to relative humidity in various NPs ratios, temperatures, time and RH ranges.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-08676-x