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<p>The rapid advancement of wearable sensors necessitates ionically conductive hydrogels that simultaneously exhibit high stretchability, damage tolerance, and reliable adhesion. However, achieving these properties in a single material remains a significant challenge. Herein, we report an ionically conductive polyoxometalate (POM)-based hydrogel (PAA/L-arg@SIW) fabricated by incorporating L-arginine (L-arg)-modified silicotungstic acid nanocomplexes (L-arg@SIW) into a poly(acrylic acid) (PAA) network as a multifunctional dynamic crosslinker. Strong electrostatic interactions and hydrogen bonding between rigid L-arg@SIW nanoclusters and flexible PAA chains generate a three-dimensional hard-soft synergistic network, in which dynamic crosslinks preferentially rupture and re-form under mechanical loading, thereby dissipating energy and suppressing crack propagation. Consequently, the hydrogel exhibits exceptional stretchability (fracture strain &gt;1500%), high toughness (1483 kJ/m<sup>3</sup>), outstanding crack resistance (fracture energy up to 6.82 kJ/m<sup>2</sup>), and high ionic conductivity (0.15 S/m), along with robust adhesion to diverse substrates. Hydrogel-based sensors demonstrate high strain sensitivity (gauge factor (GF)=8.06), fast response, and excellent cyclic stability, enabling reliable monitoring of human motion and high-fidelity acquisition of electrocardiogram (ECG) and electromyogram (EMG) signals. This study presents an effective strategy for constructing high-performance ionically conductive hydrogels for wearable sensing applications.</p>

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Interface-engineered Ionically Conductive Polyoxometalate-based Hydrogels with High Stretchability and Notch-insensitivity for Wearable Sensors

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Xiao-Jiao Shi,
  • Yu-Bin Zhang,
  • Na Li,
  • Yu-Xuan Qiao,
  • Ya Liang,
  • Gong-Kuo Yu,
  • Ai-Hong Su,
  • Ze-Cheng Song,
  • Dan-Dan Song,
  • Ti-Feng Jiao,
  • Zhi-Hui Qin

摘要

The rapid advancement of wearable sensors necessitates ionically conductive hydrogels that simultaneously exhibit high stretchability, damage tolerance, and reliable adhesion. However, achieving these properties in a single material remains a significant challenge. Herein, we report an ionically conductive polyoxometalate (POM)-based hydrogel (PAA/L-arg@SIW) fabricated by incorporating L-arginine (L-arg)-modified silicotungstic acid nanocomplexes (L-arg@SIW) into a poly(acrylic acid) (PAA) network as a multifunctional dynamic crosslinker. Strong electrostatic interactions and hydrogen bonding between rigid L-arg@SIW nanoclusters and flexible PAA chains generate a three-dimensional hard-soft synergistic network, in which dynamic crosslinks preferentially rupture and re-form under mechanical loading, thereby dissipating energy and suppressing crack propagation. Consequently, the hydrogel exhibits exceptional stretchability (fracture strain >1500%), high toughness (1483 kJ/m3), outstanding crack resistance (fracture energy up to 6.82 kJ/m2), and high ionic conductivity (0.15 S/m), along with robust adhesion to diverse substrates. Hydrogel-based sensors demonstrate high strain sensitivity (gauge factor (GF)=8.06), fast response, and excellent cyclic stability, enabling reliable monitoring of human motion and high-fidelity acquisition of electrocardiogram (ECG) and electromyogram (EMG) signals. This study presents an effective strategy for constructing high-performance ionically conductive hydrogels for wearable sensing applications.