Luo Xixi, Xie Hui, Cao Jing, Lu Yaru, Tao Shiping, Meng Zhixing, Pu Lingna, Sun Liyang, He Pengjia, Liu Ziyan
School of Materials Engineering, Xi'an Aeronautical University Xi'an 710077 China
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University Xi'an 710072 China.
RSC Adv. 2024 Apr 2;14(15):10687-10696. doi: 10.1039/d4ra00955j. eCollection 2024 Mar 26.
FeAl is a good magnetic loss absorber for microwave absorption. However, due to the relatively high density and poor impedance matching ratio, the potential of FeAl cannot be fully released. Herein, a dielectric loss absorber of carbon nanotubes (CNTs) is coupled with FeAl to form FeAl/CNTs composite absorbers. CNTs are randomly tangled and coated on the surface of the FeAl flakes, forming a connecting conductive network. By carefully tuning the content of CNTs, the optimized FeAl/CNTs composite absorber with 1.5% of CNTs can combine both magnetic loss and dielectric loss mechanisms, thus achieving an impedance matching ratio close to 1 while keeping strong attenuation for enhanced microwave absorption. As a result, an effective absorption bandwidth (RL ≤ -10 dB) of 4.73 GHz at a thickness of 2 mm is achieved.
FeAl是一种用于微波吸收的良好磁损耗吸收剂。然而，由于相对较高的密度和较差的阻抗匹配率，FeAl的潜力无法得到充分释放。在此，将碳纳米管（CNTs）介电损耗吸收剂与FeAl耦合，形成FeAl/CNTs复合吸收剂。CNTs随机缠结并包覆在FeAl薄片表面，形成连接导电网络。通过仔细调整CNTs的含量，含1.5% CNTs的优化FeAl/CNTs复合吸收剂可以结合磁损耗和介电损耗机制，从而在保持强衰减以增强微波吸收的同时，实现接近1的阻抗匹配率。结果，在厚度为2 mm时实现了4.73 GHz的有效吸收带宽（RL≤ -10 dB）。
