Li Jianwei, Chu Wei, Gao Qiang, Zhang Hongming, He Xinhai, Wang Bin
School of Materials Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, China.
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
ACS Appl Mater Interfaces. 2022 Jul 14. doi: 10.1021/acsami.2c05286.
Carbon-based materials have been recognized as a promising method to eliminate electromagnetic interference (EMI) shielding and electromagnetic (EM) wave absorption. However, developing lightweight, ultrathin, and efficient EM wave-shielding and wave-absorbing materials remains a challenge. Herein, a series of magnetic porous carbon composite films with a hierarchical network structure were fabricated via pyrolysis of porous polyimide (PI) films containing magnetic metallic salts of Fe(acac) and Ni(acac). After pyrolysis, the obtained uniform porous carbon films (CFs) possess a favorable EMI-shielding efficiency (SE) of 46 dB in the X-band with a thickness of ∼0.3 mm. In addition, a higher EMI SE of 58 dB can be achieved by increasing the thickness of the porous CF-20Ni to 0.53 mm. Moreover, the CF-20Ni composites also present effective EM wave-absorbing performance of RL = - 30.2 dB with a loading amount of 20 wt % at 13.0 GHz owing to the hierarchically conductive carbon skeleton, magnetic Ni nanoparticles, and dielectric interlaced carbon nanotube cluster within the micropores. These novel lightweight and ultrathin porous CFs are expected to be attractive candidates for efficient EM wave absorption and EMI shielding.
碳基材料已被公认为是一种消除电磁干扰（EMI）屏蔽和电磁波吸收的有前景的方法。然而，开发轻质、超薄且高效的电磁波屏蔽和吸波材料仍然是一项挑战。在此，通过对含有Fe(acac)和Ni(acac)磁性金属盐的多孔聚酰亚胺（PI）薄膜进行热解，制备了一系列具有分级网络结构的磁性多孔碳复合薄膜。热解后，所获得的均匀多孔碳薄膜（CFs）在X波段具有约0.3 mm的厚度时，展现出46 dB的良好电磁干扰屏蔽效能（SE）。此外，通过将多孔CF-20Ni的厚度增加到0.53 mm，可以实现58 dB的更高电磁干扰屏蔽效能。而且，由于微孔内分级导电的碳骨架、磁性Ni纳米颗粒和介电交错的碳纳米管簇，CF-20Ni复合材料在13.0 GHz下负载量为20 wt%时还呈现出RL = - 30.2 dB的有效电磁波吸收性能。这些新型轻质且超薄的多孔CFs有望成为高效电磁波吸收和电磁干扰屏蔽的有吸引力的候选材料。
