Bao Wenli, Chen Cong, Si Zhenjun
School of Materials Science and Engineering, Changchun University of Science and Technology, No. 7989, Weixing Road, Changchun 130022, China.
School of Physics and Electronic Information Engineering, Qinghai Nationalities University, Xining 810007, China.
Nanomaterials (Basel). 2020 May 8;10(5):902. doi: 10.3390/nano10050902.
Design of interface-controllable magnetic composite towards the wideband microwave absorber is greatly significance, however, it still remains challenging. Herein, we designed a spherical-like hybrids, using the CoO and amorphous carbon as the core and shell, respectively. Then, the existed CoO core could be totally reduced by the carbon shell, thus in CoO core (composed by Co and CoO). Of particular note, the ratios of Co and CoO can be linearly tuned, suggesting the controlled interfaces, which greatly influences the interface loss behavior and electromagnetic absorption performance. The results revealed that the minimum reflection loss value (RL) of -39.4 dB could be achieved for the optimal CoO@C sample under a thin thickness of 1.4 mm. More importantly, the frequency region with - was estimated to be 4.3 GHz, ranging from 13.7 to 18.0 GHz. The superior wideband microwave absorption performance was primarily attributed to the multiple interfacial polarization and matched impedance matching ability.
设计界面可控的磁性复合材料用于宽带微波吸收具有重要意义，然而，这仍然具有挑战性。在此，我们设计了一种类球形杂化物，分别以CoO和无定形碳作为核和壳。然后，现有的CoO核可以被碳壳完全还原，从而得到由Co和CoO组成的CoO核。特别值得注意的是，Co和CoO的比例可以线性调节，这意味着可以控制界面，而界面极大地影响界面损耗行为和电磁吸收性能。结果表明，对于最佳的CoO@C样品，在1.4 mm的薄厚度下可以实现-39.4 dB的最小反射损耗值（RL）。更重要的是，估计具有<-10 dB>的频率范围为4.3 GHz，从13.7到18.0 GHz。优异的宽带微波吸收性能主要归因于多重界面极化和匹配的阻抗匹配能力。 （注：原文中“with - ”这里似乎表述不完整，我按照推测补充了“<-10 dB>”进行翻译）
