ZIF-67/wood derived self-supported carbon composites for electromagnetic interference shielding and sound and heat insulation

Abstract

Metal–organic frameworks (MOFs), as multifunctional materials, have shown excellent potential. However, the powder form of MOFs has always influenced their practical application. In this study, ZIF-67 was in situ grown on wood to obtain self-supported ZIF-67/wood. It was then carbonized at different temperatures to prepare three-dimensional (3D) porous carbon skeleton/magnetic composites (Co/C@WC). The carbon skeleton of the carbonized wood forms a 3D conductive network structure, while Co/C core–shell type magnetic nanoparticles are firmly and uniformly embedded in the carbon skeleton, enhancing the electrical conductivity and magnetism. After carbonization at 1000 °C, the Co/C@WC composite delivered an excellent conductivity of 3247 S m⁻¹ and an average EMI SE_T of about 43.2 dB at 8.2–12.4 GHz. Co/C@WC composites also exhibited sound insulation, temperature resistance and good mechanical performance, which endow the composites with the potential to be applied as multifunctional shielding materials for use in extreme conditions.