Semi‐Interpenetrating Network Hydrogel Based on <scp>TA@MXene</scp> and Hydrogen Bonding Synergy for Pressure Sensing and Handwriting Recognition

ABSTRACT To meet the diverse demands of smart electronic devices in contemporary convenience‐driven settings, the development of multifunctional sensors is crucial. However, producing reliable multifunctional sensors remains a significant challenge, limiting their widespread adoption across various application domains. In this study, a novel multifunctional hydrogel is synthesized by incorporating antioxidant‐functionalized TA@MXene into a polyacrylamide/carboxymethyl cellulose semi‐interpenetrating network via hydrogen bonding synergy. The hydrogel exhibits remarkable properties, including outstanding stretchability (1377%), high toughness (60% compression), and strong adhesion (9.64 kPa). Additionally, it fulfills the stringent requirements for wearable sensors by demonstrating excellent antifreeze performance (−20°C), a broad sensing range (0%–600%), and stability over 500 cycles. The hydrogel also shows superior performance in monitoring human motion and facial expressions, alongside exceptional pressure sensing capabilities, accurately detecting weights from 5 to 200 g with a pressure sensitivity of up to 5.4 kPa −1 . Its durability is validated through 100‐cycle tests. The hydrogel is well‐suited for diverse applications, such as controlling light bulb functionality and handwriting recognition, achieving a recognition accuracy of 93% when paired with deep learning models. These results highlight the hydrogel's significant potential for applications in wearable electronics and smart devices.