Cat‐Vibrissa‐Inspired Biomass Fiber Aerogels for Flexible and Highly Sensitive Sensors in Monitoring Human Sport

Abstract Flexible and wearable sensors are rapidly advancing in the fields of health monitoring, intelligent interaction, and sports analysis, necessitating the development of structurally stable and highly sensitive sensing materials. Inspired by the follicle‐sinus complex (FSCs) and the signal amplification mechanism of cat vibrissae, and using polyaniline‐coated natural hemp fibers (PHFs) as the substrate, biomass PHFs/sodium alginate aerogels (BFAs) are fabricated via precursor‐assisted in situ polymerization and freeze‐synergistic assembly to optimize the conductive network. The in situ polymerization of aniline on fibers imparted a uniform conductive coating, enhancing network stability and interfacial adhesion. Benefiting from its unique fabrication strategy and biomimetic structure, the BFAs exhibit ultralow density, well‐defined porous structures, good fatigue resistance (retaining 7.24 kPa after 500 cycles). Additionally, the BFAs sensor demonstrates excellent dynamic response under varying loading rates (20 to 300 mm · min⁻¹), high sensitivity (6.01 kPa⁻¹), rapid response time (255 ms), and superior durability, enabling applications in pulse detection, handwriting recognition, and Morse code transmission. Interestingly, they can be integrated into sports equipment for real‐time dynamic response, providing valuable insights for motion optimization and data analysis. These features make the biomimetic BFAs a promising green, efficient, and cost‐effective solution in wearable electronic devices.