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<p>This study investigates the structural and functional enhancements in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/poly(vinyl alcohol) (PVA) composite films for shear sensor applications. Composite films with varying PEDOT:PSS concentrations were fabricated via solution casting technique and analyzed for their morphological, thermal, mechanical, and electrical properties. Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy confirmed the hydrogen bonding interactions between PVA and PEDOT:PSS, while scanning electron microscopy (SEM) revealed improved homogeneity with increasing PEDOT:PSS content. Conductivity measurements indicated a substantial rise with higher PEDOT:PSS concentrations, reaching a maximum of 1.7 × 10<sup>−3&#xa0;</sup>S&#xa0;cm<sup>−1</sup> at 2&#xa0;wt%. Mechanical studies demonstrated enhanced Young’s modulus and tensile strength with an associated decrease in elongation at break due to the effect of DMSO solvent in PVA/PEDOT:PSS blend. Young’s modulus increased from 3.6 to 4.4&#xa0;GPa, tensile strength increased from 112.0 to 132.7&#xa0;MPa, elongation at break decreased as the time increased, making these films suitable for flexible electronic and shear sensing applications. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) affirmed the superior thermal stability of the composites. Impedance spectroscopy exhibited optimized ionic conductivity. These findings underscore the potential of PVA-PEDOT:PSScomposite films in advanced sensing technologies due to robust mechanical integrity, high conductivity, and improved thermal stability.</p>

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Robust and conductive ultrathin PVA-PEDOT:PSS films: achieving thermal and mechanical stability for shear sensor applications

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • Shivaprasad Chalawadi,
  • Satyappa Kalliguddi,
  • Veda Gudihal,
  • Malatesh S. Pujar,
  • Rajashekhar F. Bhajantri

摘要

This study investigates the structural and functional enhancements in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/poly(vinyl alcohol) (PVA) composite films for shear sensor applications. Composite films with varying PEDOT:PSS concentrations were fabricated via solution casting technique and analyzed for their morphological, thermal, mechanical, and electrical properties. Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy confirmed the hydrogen bonding interactions between PVA and PEDOT:PSS, while scanning electron microscopy (SEM) revealed improved homogeneity with increasing PEDOT:PSS content. Conductivity measurements indicated a substantial rise with higher PEDOT:PSS concentrations, reaching a maximum of 1.7 × 10−3 S cm−1 at 2 wt%. Mechanical studies demonstrated enhanced Young’s modulus and tensile strength with an associated decrease in elongation at break due to the effect of DMSO solvent in PVA/PEDOT:PSS blend. Young’s modulus increased from 3.6 to 4.4 GPa, tensile strength increased from 112.0 to 132.7 MPa, elongation at break decreased as the time increased, making these films suitable for flexible electronic and shear sensing applications. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) affirmed the superior thermal stability of the composites. Impedance spectroscopy exhibited optimized ionic conductivity. These findings underscore the potential of PVA-PEDOT:PSScomposite films in advanced sensing technologies due to robust mechanical integrity, high conductivity, and improved thermal stability.