Stretchable Polyurethane-Based Conductive Ink for E-Textile Applications
Authors: Pengxiang Si, Li Chen, Boxin Zhao, Alex Chen, John Persic, and Robert Lyn Company: University of Waterloo, Celestica Inc., Microbonds Inc Date Published: 6/5/2018
ICSR (Soldering and Reliability)
Abstract: E-textile plays an important role in wearable electronics such as sensor, supercapacitor and nanogenerator. Coating or printing conductive ink on textile is a promising simple, inexpensive and large-scale manufacturing method. However, to obtain highly conductive conductors, most of conductive inks such as metal-based and carbon-based ink suffer from their poor adhesion onto the textile; the cured inks are prone to be wiped off and washed away. Some inks crack on textile because of the rigid property of binder and porous and deformable structure of textile. In addition, organic solvents are often used in conductive ink which is harmful to environment and human body. Here, we report our recent development of an aqueous-based conductive ink, which can penetrate into textile effectively and obtain high conductivity, high stretchability and high durability. This ink is based on highly stretchable waterbased polyurethane as binder. The ink coated textile can maintain high conductivity after 10 times of stretch and 20 times wash cycle. Finally, a strain E-textile sensor on human body shows the potential application for tracking movement.