Abstract: Friction electric nanogenerators based on natural biomaterials have become a research hotspot in sports tactile monitoring since their self-powering ability, biocompatibility, and flexibility. To design a green, flexible, and high-performance tactile sensor device, this study innovatively used a lithium chloride/N-methylpyrrolidone solvent system to extract β-chitin from discarded squid cartilage. A composite nanofiber membrane was constructed using electrospinning method, and a cuttlefish cartilage-based β-chitin triboelectric array was successfully prepared. The experiment demonstrated that the peak output voltage of the frictional electric array at 3 Hz frequency was 117.0 V. After 5,000 cycles, the peak voltage remained at about 116.8 V, and the waveform shape was basically the same as the initial stage, with a peak decrease of less than 1.0%. Further placement of the frictional electric array at the heel of the football insole successfully monitored changes in foot pressure under different motion states. The output currents under walking, running, and sprinting conditions were 3.2 μA, 5.4 μA, and 8.6 μA, with stable signals and high discrimination. This study demonstrates the potential application of natural β-chitin materials in flexible self-powered sensors and provides a high-sensitivity, low-cost tactile monitoring solution for intelligent training in football.

Key words: Cuttlefish cartilage')">Cuttlefish cartilage, β-chitin, Frictional electric array, Football sports, Tactile monitoring