Pang Zhoujun, Zhao Yu, Luo Ningqi, Chen Dihu, Chen Min
State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
Nanomaterials (Basel). 2022 Jul 22;12(15):2522. doi: 10.3390/nano12152522.
The three-dimensional (3D) carbon nanostructures/foams are commonly used as active materials for the high-performance flexible piezoresistive sensors due to their superior properties. However, the intrinsic brittleness and poor sensing properties of monolithic carbon material still limits its application. Rational design of the microstructure is an attractive approach to achieve piezoresistive material with superior mechanical and sensing properties, simultaneously. Herein, we introduce novel three-dimensional buckling carbon nanofibers (3D BCNFs) that feature a unique serpentine-buckling microstructure. The obtained 3D BCNFs exhibit superior mechanical properties, including super-elasticity (recovery speed up to 950 mm s), excellent flexibility (multiple folds), high compressibility (compressed by 90%), and high fatigue resistance (10,000 bending cycles). The pressure sensor fabricated by the 3D BCNFs shows a high sensitivity of 714.4 kPa, a fast response time of 23 ms, and a broad measuring range of 120 kPa. The pressure sensor is further applied to monitor the physiological signals of humans, and is capable of detecting the characteristic pulse waves from the radial artery, fingertip artery, and human-breath, respectively.
三维（3D）碳纳米结构/泡沫因其优异的性能，常被用作高性能柔性压阻传感器的活性材料。然而，整体碳材料固有的脆性和较差的传感性能仍然限制了其应用。合理设计微观结构是一种有吸引力的方法，能够同时实现具有优异机械性能和传感性能的压阻材料。在此，我们介绍了一种新型的三维屈曲碳纳米纤维（3D BCNFs），其具有独特的蛇形屈曲微观结构。所制备的3D BCNFs表现出优异的机械性能，包括超弹性（恢复速度高达950 mm s）、出色的柔韧性（多次折叠）、高压缩性（可压缩90%）和高抗疲劳性（10000次弯曲循环）。由3D BCNFs制成的压力传感器具有714.4 kPa的高灵敏度、23 ms的快速响应时间以及120 kPa的宽测量范围。该压力传感器进一步应用于监测人体生理信号，能够分别检测桡动脉、指尖动脉和人体呼吸的特征脉搏波。
