Structural, Electrical and Optical Properties of RGO-Incorporated PVA Nanocomposites for UV Shielding Applications

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Year : 2024 | Volume :12 | Special Issue : 06 | Page : 119-137
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Reddyvari Venugopal,

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CH. Srinivas,

  1. Assistant Professor, Department of Physics, Govt. Degree College, Mahabubabad, Mahabubabad, Telangana, India
  2. Professor, Department of Physics, University College of Engineering(A), Osmania University, Hyderabad, Telangana, India

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Polymer matrix-based nanocomposites reinforced with appropriate nanoparticles have the potential to exhibit improved electrical, optical and mechanical properties, as well as improved UV-shielding capabilities. These materials are currently being utilised for various commercial applications, such as window shields and automotive components. We prepared reduced graphene oxide (rGO)-incorporated polyvinyl alcohol (PVA) polymer nanocomposites employing a solution casting method. XRD and SEM results confirmed that the rGO nanosheets were dispersed well in the PVA polymer matrix. The presence of rGO in PVA matrices leads to a decrease in the glass transition temperature (Tg) to 87.9 ° C from 101 ° C for pure PVA, where the melting point increases from 200 to 228 ° C. The 0.9 wt.% rGO-reinforced PVA nanocomposites exhibited an increase in DC conductivity of 1.1×10-8 S/cm at room temperature. The activation energy for PVA incorporated with 0.9 wt.% rGO was 0.096 eV instead of 0.105 eV for PVA. UV-visible spectroscopy investigations were conducted within the wavelength interval between 190 and 1100 nm, during which the absorption edge, the direct band gap, the indirect bandgap, and the Urbach energy were calculated. The UV-Vis absorbance of the composite films exhibits an upward trend as the concentration of nanofillers increases. This outcome holds potential for the utilisation of films as ultraviolet filters. The nanocomposite of PVA-rGO, comprising 0.9 wt.% of rGO nanofiller, exhibited a reduction in the direct band gap from 6.15 eV to 5.0 eV. Similarly, the indirect bandgap also experienced a decrease from 4.72 eV to 3.86 eV. Furthermore, the Urbach energy displayed an increase from 0.402 eV to 0.460 eV for a concentration of 0.9 wt% rGO. The UV shielding ability (% blocking of UV radiation) of the PVA-rGO nanocomposite films monotonically increased from 45.6% for pure PVA to 83.3% for the 0.9 wt.% rGO-incorporated PVA-rGO nanocomposite films. The findings of this study indicate that the utilisation of PVA-rGO nanocomposite materials has the potential to offer significant benefits in various areas such as UV protection, photo detection, adjustable bandgap devices, optical devices controlled by refractive index, and advanced flexible optoelectronic devices.

Keywords: Solution casting, PVA-rGO nanocomposites, XRD, SEM, thermal studies, DC Conductivity and Optical Properties.

[This article belongs to Special Issue under section in Journal of Polymer and Composites (jopc)]

How to cite this article:
Reddyvari Venugopal, CH. Srinivas. Structural, Electrical and Optical Properties of RGO-Incorporated PVA Nanocomposites for UV Shielding Applications. Journal of Polymer and Composites. 2024; 12(06):119-137.
How to cite this URL:
Reddyvari Venugopal, CH. Srinivas. Structural, Electrical and Optical Properties of RGO-Incorporated PVA Nanocomposites for UV Shielding Applications. Journal of Polymer and Composites. 2024; 12(06):119-137. Available from: https://journals.stmjournals.com/jopc/article=2024/view=0


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Special Issue Open Access Original Research
Volume 12
Special Issue 06
Received 19/03/2024
Accepted 20/07/2024
Published 26/09/2024
238

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