Flexible Two-ply Piezoelectric Yarn Energy Harvester
Hyeon Jun Sim,
Chang Jun Lee,
Youn Tae Kim,
Seon Jeong Kim.
We developed a flexible two-ply piezoelectric yarn-type generator using an electrospun polyvinylidenefluorideco-
trifluoroethylene (PVDF–TrFE) mat and a commercially available silver-coated nylon fiber. By rolling the silvercoated
nylon fiber into the electrospun PVDF–TrFE mat as the inner electrode, the two-dimensional piezoelectric PVDF–
TrFE mat was easily transformed into a one-dimensional fiber. Then silver-coated nylon fiber rolled in PVDF–TrFE was
plied with another similar fiber to make a flexible two-ply piezoelectric yarn. The overall fabrication processes of the
flexible two-ply piezoelectric yarn are simple and have a high application potential. The flexible two-ply piezoelectric
yarn can generate up to 0.7 V in compression and 0.55 V in tension. The yarn retained the piezoelectric performance in
various shapes, such as a sewn structure. In addition, the piezoelectric performance was sensitive to velocity and pressure.
The flexible two-ply piezoelectric yarn has potential applications as a human motion sensor, as a building block of energy-
harvesting textiles, and in self-powered biomedical applications.
Keywords: Energy harvester, Flexible, Piezoelectric, Two-ply, Wearable, Yarn.
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