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. 2021 Oct 11;13(20):3484.
doi: 10.3390/polym13203484.

Characteristics of PEO Incorporated with CaTiO3 Nanoparticles: Structural and Optical Properties

Shujahadeen B Aziz  1   2 , Muaffaq M Nofal  3 , Mohamad A Brza  1 , Sarkawt A Hussein  1 , Khaled H Mahmoud  4 , Zeinhom M El-Bahy  5 , Elham M A Dannoun  6 , Wrya O Kareem  7 , Ahang M Hussein  1
Affiliations

Characteristics of PEO Incorporated with CaTiO3 Nanoparticles: Structural and Optical Properties

Shujahadeen B Aziz et al. Polymers (Basel). .

Abstract

In this research, direct band gap polymer composites with amorphous phase, which are imperative for optoelectronic devices applications were synthesized. The solution cast technique was used to produce polyethylene oxide (PEO)/calcium titanate (CaTiO3) nanocomposite (NC) films. The X-ray diffraction (XRD) confirms the growth of amorphous nature within PEO with CaTiO3 addition. The optical band gaps of pure PEO and PEO/CaTiO3 NC films were calculated using analysis of ultraviolet-visible (UV-Vis) spectra. The change in absorption edge toward lower photon energy is evidence of polymer modification. The dispersion behavior of the refractive index of PEO was manipulated to a higher wavelength upon doping with CaTiO3. Upon adding CaTiO3 to the pure PEO polymer, the dielectric constant and refractive index were considerably modified. The band gap shifts from 4.90 eV to 4.19 eV for the PEO incorporated with an optimum portion of 8 wt. % of CaTiO3. The types of the electronic transition in composite samples were specified, based on the Taucs model and the optical dielectric loss. The alteration of UV/Vis absorption spectra of the NC film was considered a suitable candidate to be applied in nanotechnology-based devices. The spherulites ascribed to the crystalline phase were distinguished through the optical microscopy (OM) study.

Keywords: PEO; XRD test; band gap study; optical properties; polymer nanocomposites; refractive index.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flowchart of the composite preparation process and picture of composite membrane.
Figure 2
Figure 2
XRD spectra for (a) Pure PEO, (b) NCP-1, and (c) NCP-2.
Figure 2
Figure 2
XRD spectra for (a) Pure PEO, (b) NCP-1, and (c) NCP-2.
Figure 3
Figure 3
Absorption spectra of NCP-0 and composite samples.
Figure 4
Figure 4
The transmittance of NCP-0 and composite samples.
Figure 5
Figure 5
Absorption coefficient against photon energy for NCP-0 and composite films.
Figure 6
Figure 6
Refractive index v wavelength for NCP-0 and composite films.
Figure 7
Figure 7
Dielectric loss spectra v wavelength for NCP-0 and composite films.
Figure 8
Figure 8
(αhυ)2 v photon energy for NCP-0 and composite samples.
Figure 9
Figure 9
(αhυ)2/3 v photon energy for NCP-0 and composite samples.
Figure 10
Figure 10
(αhυ)1/2 v photon energy for NCP-0 and composite samples.
Figure 11
Figure 11
(αhυ)1/3 v photon energy for NCP-0 and composite samples.
Figure 12
Figure 12
Dielectric constant vs. wavelength for NCP-0 and composite films.
Figure 13
Figure 13
Urbach plot for NCP-0 and composite films.
Figure 14
Figure 14
Optical microscopy images for (a) Pure PEO, (b) NCP-1, and (c) NCP-2 composite films.
Figure 14
Figure 14
Optical microscopy images for (a) Pure PEO, (b) NCP-1, and (c) NCP-2 composite films.
See this image and copyright information in PMC

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