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<p>In this investigation, the polyvinyl alcohol-tellurium (PVA-Te) nanocomposite thin films were synthesized with varying Te nanoparticles concentrations and their optical, electrical, and dielectric features were studied. The features of composite films were significantly impacted by Te doping. The XRD, ATR-FTIR, UV–Visible spectroscopy, SEM, and HR-TEM demonstrated uniform dispersion and efficient polymer–filler interactions, validating the effective integration of Te nanoparticles in the polyvinyl alcohol matrix. The existence of Te is indicated by the intense diffraction peaks from XRD at 22.82 and 39.5, which correspond to crystal planes (100) and (110) (JCPDS card 36-1452). HR-TEM revealed that the Te particles ranged in size from 34 to 38&#xa0;nm. Optical investigation revealed a tuneable bandgap. PVA with 0.1% Te showed the minimum direct, indirect, and forbidden bandgap of 2.88&#xa0;eV, 2.24&#xa0;eV, and 2.01&#xa0;eV. Increased UV–Visible absorption and an average 50% increase in Urbach energy were observed with Te in PVA. The&#xa0;<i>ε</i>′ and <i>ε</i>″ decreased with the intensification in frequency and variation with the inclusion of Te at inferior frequencies, signifying the polarization properties of space charges. With the Cole–Cole relaxation model fitted, impedance and AC conductivity further validate the increase in resistance and decrease in charge mobility for 0.1% Te concentration. Furthermore, the dissipation factor changed with doping, suggesting modifications to the interface’s polarization processes. The percolation threshold analysis was conducted by plotting M′ against Te concentration across different frequencies. The prepared samples could be used in sensor platforms, energy storage, and flexible electronics devices.</p>

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Impact of tellurium nanoparticle integration on the optical, electrical, and dielectric properties of PVA nanocomposite thin films

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • V. Sanjay,
  • Vinayak Pattar

摘要

In this investigation, the polyvinyl alcohol-tellurium (PVA-Te) nanocomposite thin films were synthesized with varying Te nanoparticles concentrations and their optical, electrical, and dielectric features were studied. The features of composite films were significantly impacted by Te doping. The XRD, ATR-FTIR, UV–Visible spectroscopy, SEM, and HR-TEM demonstrated uniform dispersion and efficient polymer–filler interactions, validating the effective integration of Te nanoparticles in the polyvinyl alcohol matrix. The existence of Te is indicated by the intense diffraction peaks from XRD at 22.82 and 39.5, which correspond to crystal planes (100) and (110) (JCPDS card 36-1452). HR-TEM revealed that the Te particles ranged in size from 34 to 38 nm. Optical investigation revealed a tuneable bandgap. PVA with 0.1% Te showed the minimum direct, indirect, and forbidden bandgap of 2.88 eV, 2.24 eV, and 2.01 eV. Increased UV–Visible absorption and an average 50% increase in Urbach energy were observed with Te in PVA. The ε′ and ε″ decreased with the intensification in frequency and variation with the inclusion of Te at inferior frequencies, signifying the polarization properties of space charges. With the Cole–Cole relaxation model fitted, impedance and AC conductivity further validate the increase in resistance and decrease in charge mobility for 0.1% Te concentration. Furthermore, the dissipation factor changed with doping, suggesting modifications to the interface’s polarization processes. The percolation threshold analysis was conducted by plotting M′ against Te concentration across different frequencies. The prepared samples could be used in sensor platforms, energy storage, and flexible electronics devices.