A Wearable Dual-Mode Strain Sensing Yarn: Based on the Conductive Carbon Composites and Mechanoluminescent Layer with Core-Sheath Structures

Abstract

The wearable strain sensor based on yarn or fiber has attracted wide attention. However, most of the previous research work is based on a single electrical signal or energy conversion sensor, which greatly reduces the application range of strain sensor. Therefore, multi-mode sensing under stress application conditions is particularly important, which also promotes the development of new materials. By combining resistive stress sensing with mechanical luminescence sensing, the two-mode strain sensing yarn is prepared and applied in wearable applications. The results show that the tensile strength of core-shell yarn can reach 180% and the surface brightness can reach the visual level. When the carbon concentration in the core fiber is 40%, the corresponding range is small and the resistance increases from 3 MΩ to 5MΩ. The doped luminescent powder has a strong luminescent peak at 578 nm and a small luminescent peak at 493 nm under the action of stress.

Keywords: Strain sensor, Mechanoluminescent, Conductive fiber, wearable, Dual mode sensing