School of Materials and Energy , University of Electronic Science and Technology of China , Chengdu 611731 , China.
National Engineering Research Center of Electromagnetic Radiation Control Materials, State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering , University of Electronic Science and Technology of China , Chengdu 610054 , China.
ACS Appl Mater Interfaces. 2018 Mar 21;10(11):9369-9378. doi: 10.1021/acsami.7b18324. Epub 2018 Mar 6.
Microwave absorption is a critical challenge with progression in electronics, where fine structural designing of absorbent materials plays an effective role in optimizing their microwave absorption properties. Here, we have developed FeO@C (FC) and Fe-FeO@C (FFC) hybrid nanorings via a hydrothermal method coupled with a chemical catalytic vapor deposition technique. FC and FFC hybrid nanorings have fine carbon coating while their size can easily be tunable in a certain range from 80-130 to 90-140 nm. The optimized FC and FFC hybrid nanorings bear minimum reflection loss (RL) values of -39.1 dB at 15.9 GHz and -32.9 dB at 17.1 GHz, respectively, whereas FFC shows an effective absorption bandwidth (RL values < -10 dB) ranged from 5.2 to 18 GHz. Such an enhanced microwave absorption performance of hybrid nanorings is mainly due to the suitable impedance characteristics, multilevel interfaces, and polarization features in nanorings. This work provides an approach to design hybrid materials having a complex structure to enhance the microwave absorption properties.
微波吸收是电子学发展中的一个关键挑战，在这方面，吸收材料的精细结构设计在优化其微波吸收性能方面发挥着有效作用。在这里，我们通过水热法结合化学催化气相沉积技术开发了 FeO@C（FC）和 Fe-FeO@C（FFC）混合纳米环。FC 和 FFC 混合纳米环具有精细的碳涂层，其尺寸可以在 80-130 到 90-140nm 的一定范围内轻松调节。优化后的 FC 和 FFC 混合纳米环在 15.9GHz 时的最小反射损耗（RL）值分别为-39.1dB 和-32.9dB，而 FFC 在 5.2-18GHz 范围内表现出有效的吸收带宽（RL 值 < -10dB）。混合纳米环具有如此增强的微波吸收性能主要归因于纳米环中的合适阻抗特性、多级界面和极化特性。这项工作为设计具有复杂结构的混合材料以增强微波吸收性能提供了一种方法。
