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<p>This study focuses on the synthesis of Gadolinium-doped Zinc oxide (GZO) nanoparticles via the solution combustion method and Graphene nanoribbons (GNRs) through chemical unzipping of Multi-walled Carbon Nanotubes (MWCNTs), followed by their incorporation into polyvinyl alcohol (PVA) via solution casting at concentrations of 0.0–2.0 wt/wt% to form GZO/GNR@PVA nanocomposites. The structural, morphological, and optical properties were systematically investigated using XRD, SEM, TEM, FT-IR, UV–Visible, and Photoluminescence. UV–Visible spectra revealed enhanced UV absorption, while Tauc plot analysis indicated a tunable decrease in the direct band gap from 3.09 to 2.46&#xa0;eV, suggesting strong potential for UV-blocking applications. With a contact angle of 92.51°, the polymeric nanocomposite lies just above hydrophilic value with initial stage of hydrophobicity, a wettability regime that directly influences skin–electrode impedance and signal fidelity, making it advantageous for ECG and EEG electrode applications. For biomedical evaluation, the GZO/GNR@PVA electrode was integrated into an AD8232-Arduino ECG system, exhibiting stable impedance and high-fidelity signal acquisition, with 2.0 wt/wt% showing superior performance demonstrating a constant impedance of 30 kΩ over the frequency range 150&#xa0;Hz to 1&#xa0;kHz. Furthermore, a three-lead EEG system was developed to assess brain activity in healthy and visually impaired individuals. The 1.0 wt/wt% GZO/GNR@PVA electrode effectively detected alpha and beta waves, with performance comparable to standard Ag/AgCl electrodes. These results demonstrate that the GZO/GNR@PVA nanocomposites possess significant potential for biomedical sensing and optoelectronic device applications.</p>

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Tunable band gap and high-fidelity signal acquisition in GZO/GNR Doped PVA nanocomposites for biomedical applications

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Punyashree Kattebelaguli Virupakshappa,
  • Mohan Krishnaiahnahundi Manjunathaswamy,
  • Spoorthi Raju,
  • Manjushree Nagaraju,
  • Madhukar Beejaganahalli Sangameshwar,
  • Anitha Shiva Prasad,
  • Kumara Swamy Ningappa,
  • Vedhavathi Hatna Shivarudraiah

摘要

This study focuses on the synthesis of Gadolinium-doped Zinc oxide (GZO) nanoparticles via the solution combustion method and Graphene nanoribbons (GNRs) through chemical unzipping of Multi-walled Carbon Nanotubes (MWCNTs), followed by their incorporation into polyvinyl alcohol (PVA) via solution casting at concentrations of 0.0–2.0 wt/wt% to form GZO/GNR@PVA nanocomposites. The structural, morphological, and optical properties were systematically investigated using XRD, SEM, TEM, FT-IR, UV–Visible, and Photoluminescence. UV–Visible spectra revealed enhanced UV absorption, while Tauc plot analysis indicated a tunable decrease in the direct band gap from 3.09 to 2.46 eV, suggesting strong potential for UV-blocking applications. With a contact angle of 92.51°, the polymeric nanocomposite lies just above hydrophilic value with initial stage of hydrophobicity, a wettability regime that directly influences skin–electrode impedance and signal fidelity, making it advantageous for ECG and EEG electrode applications. For biomedical evaluation, the GZO/GNR@PVA electrode was integrated into an AD8232-Arduino ECG system, exhibiting stable impedance and high-fidelity signal acquisition, with 2.0 wt/wt% showing superior performance demonstrating a constant impedance of 30 kΩ over the frequency range 150 Hz to 1 kHz. Furthermore, a three-lead EEG system was developed to assess brain activity in healthy and visually impaired individuals. The 1.0 wt/wt% GZO/GNR@PVA electrode effectively detected alpha and beta waves, with performance comparable to standard Ag/AgCl electrodes. These results demonstrate that the GZO/GNR@PVA nanocomposites possess significant potential for biomedical sensing and optoelectronic device applications.