Flexible wearable electronic devices have the characteristics of light weight, strong deformability, and easy integration into wearable clothing, and have application prospects in the fields of medical treatment, health, human-computer interaction, and soft robots. Improving the deformability of conductors and sensors and ensuring their excellent electrical performance are key issues in this field.
The flexible materials, structure and device mechanics group of the State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, and Beihang University have designed and prepared conductive materials with multi-scale spiral structure, large deformation capacity and high stability (carbon Nanotube CNTs)/polymer (polyurethane PU) composite material. The research proved theoretically and experimentally that the coupling effect of micro/nano multi-scale structure can enhance the mechanical properties of materials.
Researchers uniformly sprayed CNTs dispersion on the oriented PU nanofiber substrate and twisted to an over-twisted state to obtain CNTs/PU fibers with a multi-scale spiral structure. CNTs are wrapped inside the fiber during the twisting process to form a sandwich CNTs/PU composite structure, which improves the structural stability of the material. The coated CNTs enhance the mechanical strength of the material, and under the synergistic effect of the multi-level structure, the spiral fiber can stretch to 17 times of itself. Because of its super stretchability, low production cost, strong universality, and knitability, it can be used in fields such as flexible robots, large strain sensor devices, and smart wearable fabrics.
Related research results were published on ACS Nano (ACS Nano 2020,14,3442). Researcher Su Yewang of the Institute of Mechanics, Professor Zhao Yong of Beihang University and Associate Professor Wang Nu are the co-corresponding authors of the paper. The research work is supported by the National Natural Science Foundation of China.
Carbon nanotube (CNTs)/polyurethane (PU) fiber with multi-scale winding and interlocking spiral structure
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