محمد پريمون

Developing flexible sensors with both high sensitivity an‎d robust mechanical properties is a critical challenge. Here, we report a multifunctional nanocomposite hydrogel composed of a polyacrylamide/agar matrix, reinforced with graphene oxide (GO), an‎d rendered piezoresistive via in-situ polymerization of polyaniline (PANI). The structural an‎d morphological analyses confirmed the successful synthesis an‎d integration of the components. Increasing PANI content enhanced electrical conductivity up to 0.0026 S/cm while revealing an optimal formulation for mechanical toughness (UTS ≈ 303 Pa, elongation ≈ 58%) at a medium concentration. Crucially, the piezoresistive sensitivity exhibited a non-monotonic dependence on PANI concentration. The highest gauge factor (GF = 9.30) was achieved at the lowest PANI content, attributed to a fragile percolation network. A surprising resurgence in sensitivity (GF = 6.58) at the highest PANI concentration suggests a secondary sensing mechanism governed by micro-cracking at PANI agglomerates. This work elucidates the complex interplay between filler concentration an‎d sensing mechanisms, offering a strategic guide for designing high-performance, soft piezoresistive sensors.

پلي‌آكريل آميد , اكسيد گرافن , پلي‌آنيلين , حسگرپيزومقاومتي , هيدروژل رسانا

Flexible Electronics , Strain Sensor , Nanocomposite , Graphene Oxide , Polyaniline (PANI) , Conductive Hydrogel

Mohammad Parimoon

Shahrzad Javanshir