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

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Abstract

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 (SiO2NPs) 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 SiO2NPs. 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 SiO2NPs 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 (Eg) 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 (σac) 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.

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Acknowledgements

The author would like to thank Dr. Hikmat Banimuslem for editing.

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  1. Iraq Ministry of Education, Baghdad, Iraq

    Karar Abdali

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Abdali, K. Structural, optical, electrical properties, and relative humidity sensor application of PVA/Dextrin polymeric blend loaded with silicon dioxide nanoparticles. J Mater Sci: Mater Electron 33, 18199–18208 (2022). https://doi.org/10.1007/s10854-022-08676-x

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