High-Performance P(AM-AMPS)-PVP Conductive Hydrogel for Morse Code Recognition and Flexible Strain Sensors

In the field of advancing flexible sensor technologies, achieving both high conductivity and mechanical flexibility in hydrogel materials remains a critical challenge. To address this issue, a flexible conductive gel based on a synergistic P(AM-AMPS)-PVP network (PAAP) was developed. Through the formation of a hydrogen-bonding network and continuous ion transport pathways, the gel achieves a balanced improvement in electrical conductivity and mechanical flexibility. The resulting PAAP gel exhibits an exceptional tensile strain capacity of up to 1811%, notable ionic conductivity (59.41 mS/cm), and a very low elastic modulus (< 10 kPa), indicating strong structural resilience and adaptability under strain. These characteristics make the gel particularly suitable for use in flexible strain sensing and Morse code signal recognition. When integrated with a support vector machine (SVM) classification model, the system enables precise identification of “dot-dash” signal patterns, achieving classification accuracy exceeding 95%. This work provides a promising approach and theoretical basis for the development of flexible hydrogels in intelligent sensing, information decoding, and wearable communication technologies. Highlights A stretchable, soft, and conductive P(AM-AMPS)-PVP hydrogel for sensing. Integration of SVM enables intelligent signal recognition and interfacing. The SVM achieves a high accuracy in recognizing dot-dash signal patterns.