期刊
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
卷 27, 期 2, 页码 254-263出版社
WILEY
DOI: 10.1002/vnl.21799
关键词
actuator; carbon nanotube; composites; hybrid filler; nanographite; piezo-resistive strain sensor; RTV silicone rubber
资金
- Ministry of Education [2017R1D1A3B03031732]
- Ministry of Science, ICT and Future Planning [2020R1A4A1019227, 2019R1C1C1007840]
New technology is necessary for updating new generation flexible devices such as stretchable sensors, flexible electronics, and actuators. In this study, a stretchable strain sensor and actuator were developed based on RTV silicone rubber reinforced with carbon nanotubes (CNTs), nanographite (GR), and CNT-GR hybrids, showing improved mechanical properties for real-life applications.
New technology is constantly required for updating new generation flexible devices, such as stretchable sensors, flexible electronics, and actuators. In the present study, a stretchable strain sensor, and actuator were developed based on room-temperature-vulcanized (RTV) silicone rubber reinforced with carbon nanotubes (CNTs), nanographite (GR), and CNT-GR hybrids. A CNT-based strain sensor developed for RTV silicone rubber showed improved stiffness and brittleness. For example, at 5 phr of filler loading, the compressive and tensile modulus for the CNT-reinforced RTV silicone matrix improved by 287% and 240%, respectively. Similarly, the improvements in the compressive and tensile modulus were moderate for the CNT-GR hybrid (210% and 235%) and low for GR (135% and 125%). The improved brittleness resulted in a higher fracture strain of 170% and 155% for the CNT-GR hybrid and GR, respectively. The improved mechanical properties were tested in real-life applications of actuation. The actuation displacement at a filler loading of 2 phr increased to 1.65 mm (CNT), 1.25 mm (CNT-GR), and 0.08 mm (GR). From 2 to 8 kV, the actuation displacement increased by 825% (CNT), 830% (CNT-GR), and 32% (GR). The strain sensor showed a stretchability of >100% (CNT) and >100% (CNT-GR). In addition, the gauge factor was higher for the CNT-GR hybrid composites. The durability measurements showed that the change in resistance was negligible for up to 5000 cycles in both the CNT and CNT-GR rubber composites. A series of experiments confirmed that compared to the composite based on RTV silicone rubber and CNT, the CNT-GR hybrid showed a robust flexibility and stretchability as a piezo-resistive strain sensor and actuator.
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