石墨缺陷类型和异质原子掺杂结构对掺硫碳纤维电磁波吸收性能的影响,Crystal Growth & Design

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石墨缺陷类型和异质原子掺杂结构对掺硫碳纤维电磁波吸收性能的影响
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2023-05-22 , DOI: 10.1021/acs.cgd.3c00535
Yang Qi ₁ , Bushi Dai ₁ , Bowen Zhang ₁ , Yuxiang Dai ₁

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异质原子掺杂结构打破了局部微结构的原子级对称性，它和缺陷设计被认为是制造具有宽有效带宽和强吸收能力的微波吸收器的有效方法。在此，我们通过将引入异质原子的策略与缺陷工程相结合，成功设计并合成了硫掺杂碳纤维。拉曼光谱和透射电子显微镜数据的分析揭示了掺硫碳纤维中石墨缺陷类型与其微波吸收特性之间的对应关系。石墨与无定形碳形成的异质结构可视为边界型缺陷，有利于微波吸收。石墨晶体中空位缺陷和硫原子掺杂的引入破坏了石墨结构的对称性，导致偶极极化发生变化。控制两种硫掺杂结构C=S和C-S-C的比例，以实现材料在高频区域的微波吸收性能。一维纤维交联形成的三维结构更有利于宏观涡流损耗的形成。由于多种损耗机制的协同作用，掺硫碳纤维在极薄的厚度下实现了对微波的强烈吸收。当吸收体厚度仅为0.98 mm时，优化后的S掺杂碳纤维可达到-69.232 dB的最小反射损耗（RL），当厚度为1.04 mm时，

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Effect of Graphite Defect Type and Heterogeneous Atomic Doping Structure on the Electromagnetic Wave Absorption Properties of Sulfur-Doped Carbon Fibers

The heterogeneous atom-doped structure breaks the atomic-level symmetry of the local microstructure, and it and the defect design are considered to be an efficient way to fabricate microwave absorbers with a wide effective bandwidth and strong absorption capability. Herein, we have successfully designed and synthesized sulfur-doped carbon fibers by combining a strategy of introducing heterogeneous atoms with defect engineering. The analysis of Raman spectroscopy and transmission electron microscopy data reveals the correspondence between the type of graphite defects in sulfur-doped carbon fibers and their microwave absorption properties. The heterostructure formed by graphite and amorphous carbon can be considered a boundary-type defect, which is beneficial for microwave absorption. The introduction of vacancy defects and sulfur atom doping in graphite crystals breaks the symmetry of the graphite structure and leads to changes in dipole polarization. The ratio of the two sulfur-doped structures, C═S and C–S–C, is controlled to achieve the microwave absorption properties of the material in the high-frequency region. The three-dimensional structure formed by the cross-linking of one-dimensional fibers is more conducive to the formation of macroscopic eddy current losses. The strong absorption of microwaves at extremely thin thicknesses has been achieved with S-doped carbon fibers due to the synergy of multiple loss mechanisms. When the absorber thickness is only 0.98 mm, the optimized S-doped carbon fiber can reach a minimum reflection loss (RL) of −69.232 dB, and when the thickness is 1.04 mm, the widest effective bandwidth reaches 3.9 GHz (14.1–18 GHz), demonstrating a strong electromagnetic wave absorption capability.

更新日期：2023-05-22

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