Yi Qian, Yuyu Zhang, Jinhao Huang, Qiongya Li, Fusheng Zhang,* and Guangyan Qing*

J. Mater. Chem. C, 2025, DOI: 10.1039/D4TC05213G

https://pubs.rsc.org/en/content/articlelanding/2025/tc/d4tc05213g

    Biointerface engineering is pivotal for the seamless integration of wearable sensors with skin, offering transformative potential in bioelectronics, personalized diagnostics, and human–computer interfaces. Nonetheless, creating high-performance biointerface materials that adhere effectively to the skin while simultaneously providing breathability and preserving mechanical compliance remains a formidable challenge. Here, we present a solvent-free, ion-conductive biointerface film fabricated via the physical crosslinking of soft polyethylene oxide with phytic acid. The resulting film exhibits excellent air permeability (1.89 ± 0.02 mg cm−2 h−1), self-adhesion (89.60 ± 1.45 kPa), and mechanical compliance (skin-compatible Young's modulus of approximately 0.42 MPa). Remarkably, the material can be recycled and reused over 10 times, and dissolved quickly in hot water at 60 °C, enabling facile reprocessing. We demonstrate its efficacy as a wearable sensor conformally attached to the knuckles, providing stable electrochemical signals that accurately track bending states. In addition, we demonstrate its application as a leaf patch for continuous monitoring of plant activity over 48 hours. These findings offer a sustainable and versatile platform for advancing the development of flexible wearable technologies.