Issue 62, 2020, Issue in Progress

Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

Abstract

Films of polyethylene oxide and sodium alginate polymer blend (50/50 wt%) embedded with different quantities of Au nanoparticles with size 3–32 nm were made using the casting process. The nanocomposite films were examined by XRD analysis, FT-IR spectroscopy, TEM, UV/vis spectroscopy, and AC conductivity and dielectric parameter measurements. The XRD spectra revealed the amorphous nature of the prepared films (PEO/SA–Au NPs). From the Fourier transform infrared spectra it can be seem that the intensity of the FT-IR bands decreased which depicted the existence of the interaction between (PEO/SA) virgin polymer and gold nanoparticles. The TEM micrographs showed a cubic-structure for Au NPs with an average size of 15–20 nm. The optical properties of the polymer composite were examined by ultraviolet-visible techniques. In a direct transition the optical energy gap (Eg) of the prepared films is decreased from 4.73 to 2.92 eV and in an indirect transition decreased from 2.95 to 1.50 eV. The dielectric and electrical spectra of the obtained films were examined via dielectric broad-band spectroscopy. The electrical and dielectric measurements are appropriate for the use of the polymer nanocomposite films in the fabrication of electroactive materials.

Graphical abstract: Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

Article information

Article type
Paper
Submitted
07 Sep 2020
Accepted
06 Oct 2020
First published
12 Oct 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 37621-37630

Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

M. O. Farea, A. M. Abdelghany and A. H. Oraby, RSC Adv., 2020, 10, 37621 DOI: 10.1039/D0RA07601E

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