Piezoresistive sensing performance of multifunctional MWCNT/HDPE auxetic structures enabled by additive manufacturing

Herein, we report the mechanical and piezoresistive sensing performance of 3D printed auxetic nanocomposite structures composed a high-density polyethylene (HDPE) matrix multi-walled carbon nanotubes (MWCNTs). The multifunctional MWCNT/HDPE were measured under tensile loading. results indicate that by varying MWCNT content, as well relative density cell topology (S-shaped, Chiral Re-entrant) structure, can achieve tunable response. S-shaped cellular structure possesses superior characteristics, reporting gauge factor 7.6 at 4 wt % loading, which is ?300% higher than those for Re-entrant structures. We also present an empirical scaling equation relates structure's sensitivity to its density. findings this study provide useful guidelines design fabrication self-sensing smart materials with sensitivity.