Huang Junlong, Xie Guangzhong, Xu Xiangdong, Geng Zhenya, Su Yuanjie
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China.
Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
ACS Appl Mater Interfaces. 2024 Oct 30;16(43):58838-58847. doi: 10.1021/acsami.4c12066. Epub 2024 Oct 19.
Integration of multiple superior features into a single flexible pressure sensor would result in devices with greater versatility and utility. To apply the device to a variety of scenarios and solve the problem of accumulation of e-waste in the environment, it is highly desirable to combine degradability and wide-range linearity characteristics in a single device. Herein, we reported a degradable multilayer fabric (DMF) consisting of an ellipsoidal carbon nanotube (ECNT) and polyvinylpyrrolidone/cellulose acetate electrospun fibers (PEF). The alternative layer-by-layer stacking of the ECNT and PEF notably accelerates the sensitivity toward pressure. The optimized device demonstrated a sensitivity of 3.38 kPa over a wide measurement range from 0.1 to 500 kPa, as well as great mechanical stability over 2000 cycles. A good degradation performance was confirmed by both Fourier transform infrared (FTIR) characterization and decomposition experiments in sodium hydroxide solution. The fabricated sensor is capable of precepting a variety of physiological scenarios including subtle arterial pulse, dancing training, walking postures, and accidental falls. This work throws light onto the fundamental understanding of the mechanical interfacial coupling in piezoresistive materials and provides possibilities for the design and development of on-demand wearable electronics.
将多种卓越特性集成到单个柔性压力传感器中，将产生具有更高通用性和实用性的设备。为了将该设备应用于各种场景并解决环境中电子垃圾积累的问题，非常希望在单个设备中兼具可降解性和宽范围线性特性。在此，我们报道了一种由椭圆形碳纳米管（ECNT）和聚乙烯吡咯烷酮/醋酸纤维素电纺纤维（PEF）组成的可降解多层织物（DMF）。ECNT和PEF交替逐层堆叠显著提高了对压力的灵敏度。优化后的设备在0.1至500 kPa的宽测量范围内显示出3.38 kPa的灵敏度，以及超过2000次循环的良好机械稳定性。傅里叶变换红外（FTIR）表征和在氢氧化钠溶液中的分解实验均证实了良好的降解性能。所制备的传感器能够感知各种生理场景，包括细微的动脉脉搏、舞蹈训练、行走姿势和意外跌倒。这项工作为压阻材料中机械界面耦合的基本理解提供了启示，并为按需可穿戴电子产品的设计和开发提供了可能性。
