A novel method to develop highly conductive functional materials which can effectively shield various electromagnetic effects (EMEs) and harmful radiations. Metallized
nanotube polymer composites (MNPC) are composed of a lightweight
polymer matrix, superstrong nanotubes (NT), and functional
nanoparticle inclusions. MNPC is prepared by
supercritical fluid infusion of various
metal precursors (Au, Pt, Fe, and Ni salts), incorporated simultaneously or sequentially, into a
solid NT-
polymer composite followed by thermal reduction. The infused
metal precursor tends to diffuse toward the
nanotube surface preferentially as well as the surfaces of the NT-polymer matrix, and is reduced to form nanometer-scale
metal particles or metal coatings. The
conductivity of the MNPC increases with the metallization, which provides better shielding capabilities against various EMEs and radiations by reflecting and absorbing EM
waves more efficiently. Furthermore, the
supercritical fluid infusion process aids to improve the
toughness of the composite films significantly regardless of the existence of metal.