High-Sensitivity Flexible Capacitive Pressure Sensors Based on Biomimetic Hibiscus Flower Microstructures

作者：Ronghua Lan, Jinyong Zhang, Jing Chen, Wei Tang, Qingyang Wu, Xiaolin Zhou, Xiaoyang Kang, Jue Wang, Hongbo Wang, Hui Li · 发表于：ACS Omega · 年份：2024 · DOI：10.1021/acsomega.3c08044 · 被引用次数：33 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Gas Sensing Nanomaterials and Sensors、Conducting polymers and applications

High Resolution Image Download MS PowerPoint Slide The integration of low-dimensional nanomaterials with microscale architectures in flexible pressure sensors has garnered significant interest due to their outstanding performance in healthcare monitoring. However, achieving high sensitivity across different magnitudes of external pressure remains a critical challenge. Herein, we present a high-performance flexible pressure sensor crafted from biomimetic hibiscus flower microstructures coated with silver nanowires. When compared with a flat electrode, these microstructures as electrodes display significantly enhanced sensitivity and an extended stimulus–response range. Furthermore, we utilized an ionic gel film as the dielectric layer, resulting in an enhancement of the overall performance of the flexible pressure sensor through an increase in interfacial capacitance. Consequently, the capacitive pressure sensor exhibits an extraordinary ultrahigh sensitivity of 48.57 [Kpa] −1 within the pressure range of 0–1 Kpa, 15.24 [Kpa] −1 within the pressure range of 1–30 Kpa, and 3.74 [Kpa] −1 within the pressure range of 30–120 Kpa, accompanied by a rapid response time (<58 ms). The exceptional performance of our flexible pressure sensor serves as a foundation for its numerous applications in healthcare monitoring. Notably, the flexible pressure sensor excels not only in detecting subtle physiological signals such as finger and wrist pulse signals, vocal cord vibrations, and breathing...