Abstract
Nanocomposite films were fabricated from polyethylene oxide (PEO) and polyvinyl alcohol (PVA) incorporated with variant contents of multi-walled carbon nanotubes (MWCNTs) deposited on the glass substrates. FTIR and XRD techniques determined the chemical and structural characteristics of (PEO-PVA)/MWCNTs nanocomposite films. The optical properties, including refractive index, extinction coefficient, and dielectric functions, were comprehended via UV-Vis spectroscopy's transmittance and reflectance spectra. Classical and quantum models, including Al-Bataineh, Urbach, Spitzer-Fan, and Drude models, are employed to determine optical and optoelectronic characteristics. The optical bandgap energy of the PEO-PVA film was found to be 4.032 eV. Introducing MWCNTs to PEO-PVA films leads to a decrease in bandgap energy. The effective medium models (EMMs) described the diluted MWCNTs in the host PEO-PVA matrix. Our samples obey the Maxwell-Garnett model indicating a considerable distance between the MWCNTs in the polymer matrix with predicted possible interactions between the nanotubes and the host polymer chain. In addition, electrical conductivity increased as increasing MWCNT in PEO-PVA films.
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