Double-layer electrowetting-aided spinning for fabrication of metal-core piezoelectric-piezoresistive composite fiber

Abstract

ABSTRACT Metal core piezoelectric fiber (MPF) with excellent dynamic force response performance is a promising coaxial fiber, but its application in numerous occasions requiring simultaneous detecting of static and dynamic forces is limited due to its inability to detect static forces. To overcome this problem, this paper proposes a novel double-layer electrowetting-aided spinning to produce a metal-core piezoelectric piezoresistive composite fiber (MPPCF). The MPPCF is composed of seven layers from inside to outside including a metal core, a polyimide (PI) layer, a poly(vinylidene-trifluoro-ethylene) (P(VDF-TrFE)) layer, a poly(chloro-p-xylylene) (Parylene C) layer, a middle sliver paste layer, a multi-walled carbon nanotubes (MWCNT)-polyurethane (PU) layer and an outside silver paste layer. The results show that MPPCF with good coaxial structure and surface morphology can be prepared by this technology. After testing, the MPCCF is sensitive to the dynamic force excited by vibration and the static force caused by bending.