Xia Xiangling, Xiang Ziyin, Gao Zhiyi, Hu Siqi, Zhang Wuxu, Long Ren, Du Yi, Liu Yiwei, Wu Yuanzhao, Li Wenxian, Shang Jie, Li Run-Wei
School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, P. R. China.
CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
Adv Sci (Weinh). 2024 Oct;11(37):e2304409. doi: 10.1002/advs.202304409. Epub 2023 Nov 12.
Flexible pressure sensors are crucial force-sensitive devices in wearable electronics, robotics, and other fields due to their stretchability, high sensitivity, and easy integration. However, a limitation of existing pressure sensors is their reduced sensing accuracy when subjected to stretching. This study addresses this issue by adopting finite element simulation optimization, using digital light processing (DLP) 3D printing technology to design and fabricate the force-sensitive structure of flexible pressure sensors. This is the first systematic study of how force-sensitive structures enhance tensile strain stability of flexible resistive pressure sensors. 18 types of force-sensitive structures have been investigated by finite element design, simultaneously, the modulus of the force-sensitive structure is also a critical consideration as it exerts a significant influence on the overall tensile stability of the sensor. Based on simulation results, a well-designed and highly stretch-stable flexible resistive pressure sensor has been fabricated which exhibits a resistance change rate of 0.76% and pressure sensitivity change rate of 0.22% when subjected to strains ranging from no tensile strain to 20% tensile strain, demonstrating extremely low stretching response characteristics. This study presents innovative solutions for designing and fabricating flexible resistive pressure sensors that maintain stable sensing performance even under stretch conditions.
柔性压力传感器由于其可拉伸性、高灵敏度和易于集成，在可穿戴电子设备、机器人技术和其他领域中是至关重要的力敏器件。然而，现有压力传感器的一个局限性是在受到拉伸时其传感精度会降低。本研究通过采用有限元模拟优化来解决这个问题，利用数字光处理（DLP）3D打印技术设计和制造柔性压力传感器的力敏结构。这是关于力敏结构如何增强柔性电阻式压力传感器拉伸应变稳定性的首次系统性研究。通过有限元设计研究了18种类型的力敏结构，同时，力敏结构的模量也是一个关键考虑因素，因为它对传感器的整体拉伸稳定性有重大影响。基于模拟结果，制造出了一种精心设计且具有高度拉伸稳定性的柔性电阻式压力传感器，当受到从无拉伸应变到20%拉伸应变的变化时，其电阻变化率为0.76%，压力灵敏度变化率为0.22%，展现出极低的拉伸响应特性。本研究为设计和制造即使在拉伸条件下也能保持稳定传感性能的柔性电阻式压力传感器提供了创新解决方案。
