Polyaniline-Coated ZIF-67-Derived Co/C Nanostructures for Efficient Electromagnetic Wave Absorption

Metal-organic frameworks (MOFs) have diverse structures,thus sparking strong research interest in the field of electromagneticwave (EMW) absorption. In this work, zeolitic imidazolate framework-67(ZIF-67) was hydrothermally synthesized and thermally annealed toform rhombic dodecahedral Co/C nanocomposites with desirable porousstructures. Then, a layer of rod-shaped polyaniline was coated onthe surface of the Co/C nanocomposites through in situ polymerization.The effect of the mass ratio of polyaniline to Co/C on the electromagneticproperties of the nanocomposites was studied. The sample Co/C@PANI-2exhibited an optimal reflection loss of -67.67 dB and an effectiveabsorption bandwidth of 5.02 GHz at a filling ratio of 50%. The rod-likepolyaniline coating effectively enhanced the electromagnetic propertiesand impedance matching of the nanocomposites. This work provides areference for the composite of MOF-derived nanomaterials and conductingpolymers in EMW absorption studies.