Gao Xue, Zhou Fang, Li Mengyuan, Wang Xueqin, Chen Shaojuan, Yu Jianyong
College of Textiles and Clothing, Qingdao University, Shandong 266071, China.
Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China.
ACS Appl Mater Interfaces. 2021 Nov 10;13(44):52811-52821. doi: 10.1021/acsami.1c17789. Epub 2021 Oct 29.
Mechanically flexible ceramic fiber-based electronic skins are attractive materials ascribed to the features of monitoring signals of various physical parameters in a harsh environment, but the inherent brittleness of the ceramic fibers has limited their wide applications in emerging fields, such as fire-protecting clothing. Herein, a strategy to fabricate the flexible stannum(IV)-doped SrTiO (SSTO) nanofiber membranes by a facile sol-gel electrospinning method is reported. The calcination temperature and Sn doping content play vital roles in regulating the crystalline and pore structures that are closely relevant to the flexibility and mechanical properties of the resultant SSTO nanofiber membranes. The as-prepared SSTO nanofiber membranes exhibited exceptional flexibility with an optimum tensile strength of 0.22 MPa, an elongation rate of 1.8%, and a Young's modulus of 13.3 MPa. Significantly, the flexible SSTO nanofiber-based piezoresistive sensors exhibited intriguing sensing performance toward pressure involving high sensitivity (2.24 kPa) in a low-pressure range (<400 Pa), fast response time (12 ms) and recovery time (32 ms), good durability (>1000 cycles), and excellent stability at different humidity levels and elevated temperatures. Furthermore, the sensor can also accurately monitor the signals of human motion such as finger bending, throat swallowing, and radial pulse. The fabrication of flexible ceramic nanofiber-based piezoresistive sensors would pave the way to fabricate wearable devices for fire-protecting clothing, personal healthcare, real-time human activity detection.
基于机械柔性陶瓷纤维的电子皮肤是一种有吸引力的材料，这归因于其能够在恶劣环境中监测各种物理参数信号的特性。然而，陶瓷纤维固有的脆性限制了它们在新兴领域（如防火服）中的广泛应用。在此，报道了一种通过简便的溶胶 - 凝胶静电纺丝法制备柔性锡（IV）掺杂钛酸锶（SSTO）纳米纤维膜的策略。煅烧温度和锡掺杂含量在调节与所得SSTO纳米纤维膜的柔韧性和机械性能密切相关的晶体和孔隙结构方面起着至关重要的作用。所制备的SSTO纳米纤维膜表现出优异的柔韧性，最佳拉伸强度为0.22MPa，伸长率为1.8%，杨氏模量为13.3MPa。值得注意的是，基于柔性SSTO纳米纤维的压阻式传感器在压力传感方面表现出有趣的性能，包括在低压范围（<400Pa）内具有高灵敏度（2.24kPa）、快速响应时间（12ms）和恢复时间（32ms）、良好的耐久性（>1000次循环）以及在不同湿度水平和高温下的出色稳定性。此外，该传感器还能够准确监测人体运动信号，如手指弯曲、喉咙吞咽和桡动脉脉搏。柔性陶瓷纳米纤维基压阻式传感器的制造将为制造用于防火服、个人医疗保健、实时人体活动检测的可穿戴设备铺平道路。
