Highly Compressible and Sensitive Pressure Sensor under Large Strain Based on 3D Porous Reduced Graphene Oxide Fiber Fabrics in Wide Compression Strains
| Autor: | Chaohe Xu, Yuan-Qing Li, Jianhui Qiu, Zongling Ren, Ning Hu, H. Jerry Qi, Ya-Fei Fu, Xiaoping Jiang, Ya-Feng Liu, Huiming Ning, Rui Zou, Guipeng Ji, Shao-Yun Fu, Jie Wen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Graphene Contact resistance 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pressure sensor Flexible electronics 0104 chemical sciences law.invention Electrical resistance and conductance Gauge factor law General Materials Science Fiber Composite material 0210 nano-technology Electrical conductor |
| Zdroj: | ACS Applied Materials & Interfaces. 11:37051-37059 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | The development of highly sensitive wearable and foldable pressure sensors is one of the central topics in artificial intelligence, human motion monitoring, and health care monitors. However, current pressure sensors with high sensitivity and good durability in low, medium, and high applied strains are rather limited. Herein, a flexible pressure sensor based on hierarchical three-dimensional and porous reduced graphene oxide (rGO) fiber fabrics as the key sensing element is presented. The internal conductive structural network is formed by the rGO fibers which are mutually contacted by interfused or noninterfused fiber-to-fiber interfaces. Thanks to the unique structures, the sensor can show an excellent sensitivity from low to high applied strains (0.24-70.0%), a high gauge factor (1668.48) at an applied compression of 66.0%, a good durability in a wide range of frequencies, a low detection limit (1.17 Pa), and anultrafast response time (30 ms). The dominated mechanism is that under compression, the slide of the graphene fibers through the polydimethylsiloxane matrix reduces the connection points between the fibers, causing a surge in electrical resistance. In addition, because graphene fibers are porous and defective, the change in geometry of the fibers also causes a change in the electrical resistance of the composite under compression. Furthermore, the interfused fiber-to-fiber interfaces can strengthen the mechanical stability under 0.01-1.0 Hz loadings and high applied strains, and the wrinkles on the surface of the rGO fibers increased the sensitivity under tiny loadings. In addition, the noninterfused fiber-to-fiber interfaces can produce a highly sensitive contact resistance, leading to a higher sensitivity at low applied strains. |
| Databáze: | OpenAIRE |
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