3D-Printed Thermoplastic Polyurethane Filaments with Carbon Nanotubes for Sensing Applications

In this study, we implemented the simulation software Comsol Multiphysics to search for a proper proportion of carbon-filled thermoplastic polyurethane (CTPU) and neat thermoplastic polyurethane (STPU) in melt-extruded filaments, and we proposed practical 3D-printed shape for its use in wearables. A comparative study was performed to investigate the impact of 3D-printing temperature and diverse sensor structures via electrical testing. The optimal shape was found to be the ‘space grid’ structure, printing processing temperature of 210°C and the proper proportion of CTPU 60%/ STPU 40%.