Tuning the bandgap and absorption behaviour of the newly-fabricated Ultrahigh Molecular weight Polyethylene Oxide- Polyvinyl Alcohol/ Graphene Oxide hybrid nanocomposites

Abstract

Graphene nanosheets are promising nanofillers to the tunable structure, properties of materials, and optical bandgap. This search focuses on investigating the new nanocomposites of Ultra-high molecular weight polyethylene oxide (UHMWPEO) with different loading ratios of polyvinyl alcohol (PVA) reinforced with graphene oxide (GO) by applying the modified solution-sonication-casting method. Fourier-transform infrared spectroscopy (FTIR) shows strong interfacial interaction between the blended polymers and GO nanosheets in the nanocomposites. X-Ray diffraction (XRD) reveals a significant shifting in the PEO and reduction in the crystallinity. Optical microscopy (OM) images exhibit fine homogeneity of the polymer in the matrix with excellent dispersal of GO in nanocomposites as supported by scanning electron microscopy (SEM). Attractively, the samples with a higher ratio of UHMWPEO exhibit better optical behavior, and great improvements were presented after the contribution of GO. UV-visible spectroscopy has characterized the absorption, absorption coefficient, real and imaginary, bandgap, and other parameters. The allowed bandgap was significantly enhanced by reducing up to 80%, whereas the forbidden bandgap was improved by up to 160% of the nanocomposites. Additionally, nanocomposites exhibited significant adsorption of radiation-ray, especially after the contribution of GO. The findings are promising as various applications could come to the fore: radiation protection, spectroscopy devices, and other applications.

Transparent ultrahigh-molecular-weight polyethylene/MXene films with efficient UV-absorption for thermal management

“…For example, the σ, ε, and E values of the 0.1M2B film were 22 MPa, 554%, and 129.89 MPa, respectively, which are much higher than those of the pure UHMWPE film (14.2 MPa, 218.5%, and 74.3 MPa, respectively). This is due to the fact that when strain is applied, the tension in the UHMWPE matrix is transferred to MXene, whose unique two-dimensional laminate structure is able to withstand the strain and absorb the energy from external pressure forming strong interfacial interaction with UHMWPE 10 , 43 , thus preventing the creation and expansion of cracks. However, with a further increase in the MXene content, the mechanical properties of the composite films decreased gradually.…”

Effect of the Functional Groups of Polymers on Their Adsorption Behavior on Graphene Oxide Nanosheets

“…These new peaks, at 3172, 1722, 1621, 1377, 1222, 1042, and 970 cm −1 wavenumber, correspond to O-H stretching (free water), C=O stretching, C=C stretching, C-O stretching, O-H bending, C-O-C stretching and C-O stretching, respectively. [33,34] In Figure 2B, the XRD pattern of graphite shows peaks for (002), (100), ( 101), (102), and (103) hexagonal planes along the c-axis direction. [35] The (002) peak of graphite shifts from 2𝜃 = 26.4°to 2𝜃 = 10.1°which becomes a (001) peak in GO, corresponding to interlayer spacings of 0.33 nm and 0.87 nm of graphite and GO respectively, in agreement with the literature.…”

Dielectric, AС Conductivity and Optical Characterizations of (PVA-PEG) Doped SrO Hybrid Nanocomposites

“…It can be seen that the energy gap values were decreased by increasing the ratio of SrO NPs in the samples. This resulted in the on-site levels in the energy gap [33]. In this case, the transition is carried out in 2 stages, involving the electron transition from the band of valence to local conduction band levels due to the increase of SrO NPs.…”