State Key Laboratory of Silicate Materials for Architectures, Center for Smart Materials and Device Integration, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China.
Hubei Key Laboratory of Energy Storage and Power Battery, School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, P. R. China.
ACS Appl Mater Interfaces. 2024 Mar 13;16(10):12996-13005. doi: 10.1021/acsami.3c16125. Epub 2024 Feb 29.
Flexible pressure sensors are intensively demanded in various fields such as electronic skin, medical and health detection, wearable electronics, etc. MXene is considered an excellent sensing material due to its benign metal conductivity and adjustable interlayer distance. Exhibiting both high sensitivity and long-term stability is currently an urgent pursuit in MXene-based flexible pressure sensors. In this work, high-strength methylcellulose was introduced into the MXene film to increase the interlayer distance of 2D nanosheets and fundamentally overcome the self-stacking problem. Thus, concurrent improvement of the sensing capability and mechanical strength was obtained. By appropriately modulating the ratio of methylcellulose and MXene, the obtained pressure sensor presents a high sensitivity of 19.41 kPa (0.88-24.09 kPa), good stability (10000 cycles), and complete biodegradation in HO solution within 2 days. Besides, the sensor is capable of detecting a wide range of human activities (pulse, gesture, joint movement, etc.) and can precisely recognize spatial pressure distribution, which serves as a good candidate for next-generation wearable electronic devices.
柔性压力传感器在电子皮肤、医疗健康检测、可穿戴电子等诸多领域有着广泛的需求。由于其良好的金属导电性和可调节的层间距，MXene 被认为是一种很有前途的传感材料。目前，提高基于 MXene 的柔性压力传感器的灵敏度和长期稳定性是一个迫切的追求。在这项工作中，高强度的甲基纤维素被引入到 MXene 薄膜中，以增加二维纳米片的层间距，从根本上克服了自堆叠问题。因此，同时提高了传感性能和机械强度。通过适当调节甲基纤维素和 MXene 的比例，所获得的压力传感器在 0.88-24.09 kPa 的压力范围内表现出 19.41 kPa 的高灵敏度、良好的稳定性（10000 次循环），并且在 2 天内在 HO 溶液中完全可生物降解。此外，该传感器能够检测到广泛的人体活动（脉搏、手势、关节运动等），并能精确识别空间压力分布，是下一代可穿戴电子设备的理想选择。
