Research on the Preparation and Performance of Flexible Pressure Sensors Based on Ti3AlC2@NaKC4H4O6

To enable effective monitoring of human physiological signals, this study fabricates a piezoresistive flexible pressure sensor using a composite of Ti 3 AlC 2 (a type of MXene material) and NaKC 4 H 4 O 6 as the sensing material. The structure of Ti 3 AlC 2 before and after composite formation was observed via scanning electron microscopy, while x-ray diffraction, x-ray photoelectron spectroscopy, and energy-dispersive x-ray spectroscopy characterizations were conducted. Based on these analyses, the binding behavior between Ti 3 AlC 2 and NaKC 4 H 4 O 6 , as well as the mechanism underlying the enhanced sensing performance, were elucidated. The mechanism underlying the enhanced pressure response was further analyzed from the perspective of heterojunctions. In pressure testing, the as-fabricated pressure sensor demonstrates outstanding performance, including a high sensitivity of 2.46%/kPa within the range of 0–30 kPa and a rapid response time of 0.2 s. It has also successfully detected scenarios including wrist flexion, pulse beats, and fist clenching, thereby demonstrating promising application potential in physiological signal monitoring.