自支撑碳纳米管巴基纸/Fe3O4/聚苯胺复合薄膜的制备及其电磁屏蔽性能OA

A balance between electrical and magnetic properties is critical for electromagnetic shielding materi-als to achieve excellent electromagnetic interference(EMI)shielding and attenuation effectiveness across a broad frequency range.We have prepared free-standing buckypaper films(BPFP)decorated with Fe3O4 particles and polyaniline(PANI)by a simple two-step method to meet this requirement.First,buckypaper films decorated with Fe3O4(BPF)were synthesized by the coprecipitation of Fe2+/Fe3+ions on buckypaper(BP)which was then coated with a polyaniline layer by the in situ polymeriza-tion of aniline monomers.Magnetic characterization re-vealed that the BPF and BPFP films had saturation mag-netization(Ms)values of 14.3 emu g-1 and 13.0 emu g-1,respectively,confirming retention of the magnetic phase.The addition of Fe3O4 nanoparticles and polyaniline to BP(30 μm)increased both the magnetic and dielectric losses due to the increased in-terfacial polarizations and anisotropy energy.41 μm-thick BPF and BPFP films had an absorption-dominated shielding effect-iveness of 35.1 dB and 36.4 dB,respectively,across the 5.85-18 GHz frequency band.These values are respectively 12.9%and 17.0%greater than that of pristine BP,highlighting the positive effect of Fe3O4-PANI heterostructures on electromagnetic wave dissipation.These films also had the tensile strength,flexibility,and lightness of BP,demonstrating exceptional promise for next-generation electromagnetic shielding materials.