Zhang Weidong, Zhang Xue, Zhu Qing, Zheng Yuan, Liotta Leonarda Francesca, Wu Hongjing
College of Chemical Engineering, Qinghai University, Xining 810016, China.
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
J Colloid Interface Sci. 2021 Mar 15;586:457-468. doi: 10.1016/j.jcis.2020.10.109. Epub 2020 Nov 2.
Carbon fiber (CF) is a significant multifunction material, which is extensively used in aircraft because of its superb performance. However, its microwave absorption properties (MAPs) are seriously restricted as a result of the impedance mismatch issue. To address this issue, an efficient strategy is conducted by a series of CF@MoS and CF@MoS@FeO composites that are fabricated by in-situ grown MoS nanosheets (MoS-NS) and FeO nanoparticles (FeO-NPs) on the surface of CF. The results of microwave absorption performance (MAP) reveal that the minimum reflection loss (RL) can reach -21.4 dB with a CF@MoS composite coating thickness of 3.8 mm; the effective attenuation bandwidth (RL < -10 dB, i.e., 90% microwave energy is attenuated) is up to 10.85 GHz (7.15-18.0 GHz). From a detailed analysis, it is observed impedance mismatch is the critical limiting factor for MAPs rather than attenuation. Furthermore, for CF@MoS@FeO, the MAP is strongly dependent on the level of coating of magnetic FeO-NPs on the surface of CF@MoS composites. The mechanisms underlying the superb MAP and related phenomena are investigated, opening new directions for fabricating CF-based microwave absorbers with high efficiency and wide-bandwidth. Finally, the occurrence of multi-reflection phenomena of EM waves in absorbers are critically analyzed.
碳纤维（CF）是一种重要的多功能材料，因其卓越的性能而被广泛应用于飞机制造中。然而，由于阻抗失配问题，其微波吸收性能（MAPs）受到严重限制。为了解决这个问题，通过一系列CF@MoS和CF@MoS@FeO复合材料实施了一种有效策略，这些复合材料是通过在CF表面原位生长MoS纳米片（MoS-NS）和FeO纳米颗粒（FeO-NPs）制备而成的。微波吸收性能（MAP）结果表明，CF@MoS复合涂层厚度为3.8 mm时，最小反射损耗（RL）可达到-21.4 dB；有效衰减带宽（RL < -10 dB，即90%的微波能量被衰减）高达10.85 GHz（7.15 - 18.0 GHz）。通过详细分析发现，阻抗失配是MAPs的关键限制因素，而非衰减。此外，对于CF@MoS@FeO，MAP强烈依赖于磁性FeO-NPs在CF@MoS复合材料表面的包覆程度。研究了卓越MAP及相关现象背后的机制，为制备高效宽带的CF基微波吸收体开辟了新方向。最后，对吸收体中电磁波的多次反射现象进行了批判性分析。
