Porous Co nanospheres supported on nitrogen-doped graphene as high-efficiency electromagnetic wave absorbers with thin thickness
| Autor: | Yong Sun, Zhaoyu Ren, Xinliang Zheng, Chenjing Zhao, Fanfan Yan, Xinghua Li, Guoguo Tan, Yan Zong |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Nanocomposite
Materials science Nanostructure business.industry Graphene Mechanical Engineering Reflection loss Metals and Alloys Hexagonal phase 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation 0104 chemical sciences law.invention Mechanics of Materials law Materials Chemistry Optoelectronics 0210 nano-technology business Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Alloys and Compounds. 742:928-936 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.01.388 |
| Popis: | The design of magnetic/dielectric composites with rational nanostructures can greatly determine the electromagnetic wave absorption performance of absorbers. Herein, the porous magnetic Co nanospheres supported on lightweight dielectric nitrogen-doped graphene (N-GN) were prepared through a simple one-pot solvothermal method as enhanced synergistic electromagnetic wave absorbers. The Co nanocrystals show porous spherical shape with hexagonal phase, which are supported uniformly on the crumpled N-GN without conglomeration. Even powerful ultrasound treatment cannot separate the Co nanospheres from N-GN, suggesting that the porous Co nanospheres are in-situ anchored on N-GN. Taking the combined advantages of magnetic porous Co nanospheres and dielectric lightweight N-GN, the Co/N-GN nanocomposites perform improved electromagnetic wave absorption abilities, such as high-efficiency absorption performance, thin matching thickness and broad effective absorption bandwidth. When the absorber thickness of nanocomposites is only 1.3 mm, the maximum reflection loss (RL) value can reach −24.3 dB at 17.7 GHz. And the effective absorption frequency with RL |
| Databáze: | OpenAIRE |
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