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<p>This study considers the polymer solvent casting method to synthesize polyvinyl alcohol (PVA) and reduced graphene oxide (rGO) composites. Systematic investigations were conducted on different concentrations—PVA/rGO 85%/15%, 90%/10%, and 95%/5%—to clarify their structural, electrical, thermal, and mechanical properties. X-ray diffraction (XRD) was employed for structural analysis, confirming the crystallinity and phase interaction of the composites. Fourier Transform Infrared Spectroscopy (FTIR) was used to identify functional groups and confirm the chemical bonding between PVA and rGO. Scanning Electron Microscopy (SEM) revealed the morphological evolution and dispersion behavior of rGO nanosheets in the PVA matrix. Additionally, Thermogravimetric Analysis (TGA) was performed to evaluate the thermal stability of the composites, which showed improved resistance to thermal degradation with increasing rGO content. Electrical properties were thoroughly studied using impedance spectroscopy and current–voltage (I–V) measurements. The Nyquist plot provided further insight into impedance, while dielectric loss spectra, modulus spectra, and tangent loss spectra helped explore dielectric behavior in depth. Mechanical properties including tensile strength, load, modulus, and elongation at break were examined to assess the effect of rGO concentration on the flexibility and durability of the composites.</p>

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PVA/rGO composites for advanced electronic devices: a comprehensive analysis of structural, electrical, and mechanical properties and concentrations

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • J. Godwin Christus Selvin,
  • S. K. Suresh Babu,
  • V. Haritha Sree,
  • J. Roshan Johns

摘要

This study considers the polymer solvent casting method to synthesize polyvinyl alcohol (PVA) and reduced graphene oxide (rGO) composites. Systematic investigations were conducted on different concentrations—PVA/rGO 85%/15%, 90%/10%, and 95%/5%—to clarify their structural, electrical, thermal, and mechanical properties. X-ray diffraction (XRD) was employed for structural analysis, confirming the crystallinity and phase interaction of the composites. Fourier Transform Infrared Spectroscopy (FTIR) was used to identify functional groups and confirm the chemical bonding between PVA and rGO. Scanning Electron Microscopy (SEM) revealed the morphological evolution and dispersion behavior of rGO nanosheets in the PVA matrix. Additionally, Thermogravimetric Analysis (TGA) was performed to evaluate the thermal stability of the composites, which showed improved resistance to thermal degradation with increasing rGO content. Electrical properties were thoroughly studied using impedance spectroscopy and current–voltage (I–V) measurements. The Nyquist plot provided further insight into impedance, while dielectric loss spectra, modulus spectra, and tangent loss spectra helped explore dielectric behavior in depth. Mechanical properties including tensile strength, load, modulus, and elongation at break were examined to assess the effect of rGO concentration on the flexibility and durability of the composites.