Liu Zhihao, Liang Tianlong, Xin Yue, Huang Jinhao, Liang Jionghong, He Xiang, Zhang Chi, Yang Weijia, He Xin
School of Applied Physics and Materials, Wuyi University Jiangmen 529020 Guangdong P. R. China
RSC Adv. 2021 May 11;11(28):17291-17300. doi: 10.1039/d1ra03207k. eCollection 2021 May 6.
Developing a high-performance capacitive sensor for diverse application scenarios has posed requirements for the sensor to have high sensitivity, broad detection range, and cost-effectiveness. In this experiment, a flexible pressure sensor with a high sensitivity of 2.08 kPa at pressure lower than 1 kPa, as well as a wide working range of 0-600 kPa and remarkable stability (for at least 4000 cycles), was designed. In the device structure, silver nanowires (Ag NWs)/MXene-composite-coated polydimethylsiloxane (PDMS) and natural bamboo leaves at different growth stages were used as the electrode and the micro-structured dielectric layers, respectively. The rough surface of the composite conductive materials and the hierarchical microstructure of the bamboo leaves ensured a high sensitivity and broad pressure range of the sandwich-structured sensor, and the different sizes of the microstructures yielded adjustable sensitivity of the sensor. Furthermore, the outstanding performance of the proposed device made it possible to detect the actual object load, human physical stimuli, and proximity distance, demonstrating applications of flexible and wearable devices in various fields, such as weight/force tapping, breath/wrist pulse/speech, joint bending, and approach distance.
开发一种适用于多种应用场景的高性能电容式传感器，对传感器的高灵敏度、宽检测范围和成本效益提出了要求。在本实验中，设计了一种柔性压力传感器，其在低于1 kPa的压力下灵敏度高达2.08 kPa，工作范围为0 - 600 kPa，具有显著的稳定性（至少4000次循环）。在器件结构中，分别使用银纳米线（Ag NWs）/MXene复合涂层聚二甲基硅氧烷（PDMS）和不同生长阶段的天然竹叶作为电极和微结构介电层。复合导电材料的粗糙表面和竹叶的分级微结构确保了三明治结构传感器的高灵敏度和宽压力范围，不同尺寸的微结构使传感器的灵敏度可调。此外，所提出器件的出色性能使其能够检测实际物体负载、人体物理刺激和接近距离，展示了柔性可穿戴设备在各种领域的应用，如重量/力敲击、呼吸/手腕脉搏/语音、关节弯曲和接近距离。
