Liu Yue, Tao Juan, Yang Wenkai, Zhang Yufei, Li Jing, Xie Huilin, Bao Rongrong, Gao Wenchao, Pan Caofeng
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
Small. 2022 Feb;18(8):e2106906. doi: 10.1002/smll.202106906. Epub 2021 Dec 18.
Resistive pressure sensors have been widely studied for application in flexible wearable devices due to their outstanding pressure-sensitive characteristics. In addition to the outstanding electrical performance, environmental friendliness, breathability, and wearable comfortability also deserve more attention. Here, a biodegradable, breathable multilayer pressure sensor based piezoresistive effect is presented. This pressure sensor is designed with all biodegradable materials, which show excellent biodegradability and breathability with a three-dimensional porous hierarchical structure. Moreover, due to the multilayer structure, the contact area of the pressure sensitive layers is greatly increased and the loading pressure can be distributed to each layer, so the pressure sensor shows excellent pressure-sensitive characteristics over a wide pressure sensing range (0.03-11.60 kPa) with a high sensitivity (6.33 kPa ). Furthermore, the sensor is used as a human health monitoring equipment to monitor the human physiological signals and main joint movements, as well as be developed to detect different levels of pressure and further integrated into arrays for pressure imaging and a flexible musical keyboard. Considering the simple manufacturing process, the low cost, and the excellent performance, leaf vein-based pressure sensors provide a good concept for environmentally friendly wearable devices.
由于其出色的压敏特性，电阻式压力传感器在柔性可穿戴设备中的应用已得到广泛研究。除了出色的电气性能外，环境友好性、透气性和可穿戴舒适性也值得更多关注。在此，提出了一种基于压阻效应的可生物降解、透气的多层压力传感器。该压力传感器采用全可生物降解材料设计，具有三维多孔分级结构，表现出优异的生物降解性和透气性。此外，由于多层结构，压敏层的接触面积大大增加，加载压力可以分布到每一层，因此该压力传感器在宽压力传感范围（0.03 - 11.60 kPa）内表现出优异的压敏特性，灵敏度高（6.33 kPa⁻¹）。此外，该传感器用作人体健康监测设备，用于监测人体生理信号和主要关节运动，还可用于检测不同程度的压力，并进一步集成到阵列中用于压力成像和柔性音乐键盘。考虑到制造工艺简单、成本低和性能优异，基于叶脉的压力传感器为环保型可穿戴设备提供了一个很好的概念。
