Effect of percolation on the electrical conductivity of amino molecules non-covalently coated multi-walled carbon nanotubes/epoxy composites

► The amino groups were built on the surface of multi-walled carbon nanotubes (MWNTs) using tetrazine by non-covalent modification. ► The building of amino groups on the surface of MWNTs can greatly improve the dispersion of MWNTs in EP matrices, which is more important for MWNTs to form an electrically conductive network to enhance the electrical conductivity. ► The percolation threshold of the amino coated MWNTs/EP composites was 0.13 wt%, while the pristine MWNTs/EP composites were 0.51 wt%.