Liquid Metal/Silicone Hollow Spiral Pressure Sensing Fibers with Stretch Insensitivity
摘要
Stretch-resistant liquid metal/silicone hollow spiral fiber (LM/SHSF) capacitive pressure sensors were prepared using liquid metal (LM) and silicone tubes, which acted as the electrode and the dielectric layers, respectively. Owing to the spiral structure of the fibers, their capacitance change rate was < 10% under different pressures at prestretching ratios of 120 and 160% with a pressure resolution of < 1 N. At a small prestretching ratio, the silicone hollow fibers primarily exhibited elastic deformation. However, at a prestretching ratio of 200%, plastic deformation occurred. Therefore, the prestretched silicone hollow fibers could not fully recover their original length. LM/SHSF-160 exhibited the smallest spiral pitch and densest spiral structure, indicating the best elastic properties. Therefore, when used as a sensing material, LM/SHSF-160 exhibited the best resistance to tensile interference, with a capacitance change rate of < 8% after applying 100% strain under different pressures.