期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 16, 页码 18952-18963出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04185
关键词
Fe3O4 nanoparticles; polymeric microcapsules; hollow carbon microspheres; hierarchical micro/nanostructures; microwave absorption
资金
- National Natural Science Foundation of China [51503026]
- Program for the Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51721091]
- Fundamental Research Funds for the Central Universities [2017SCU04A14, YJ201821]
- Sichuan Province Youth Science and Technology Innovation Team [2017TD0006]
Although the existing Fe3O4-based microwave absorbing materials (MAMs) have shown promising microwave absorbing (MA) capacity, it is highly desired but still remains a great challenge to achieve strong minimum reflection loss (RLmin) and broad effective frequency bandwidth (fe) at an ultralow filler loading. Herein, for the first time, by carbonizing hierarchical poly(urea-formaldehyde) microcapsules with Fe3O4 nanoparticle cores in a nitrogen atmosphere, Fe3O4 hybrid and N-doped hollow carbon microspheres (Fe3O4/CMs) with a hierarchical micro/ nanostructure are prepared on a large scale and at a low cost to achieve extremely superior MA performances. Benefitting from their unique structure and diverse composition, which synergetically contribute to good impedance matching, strong dielectric/ magnetic loss, and abundant multiscattering/reflection, Fe3O4/CM composites possessed a RLmin value reaching -60.3 dB and an fe of as broad as 6.4 GHz (7.2-13.6 GHz, covering the full X-band) at an ultralow filler loading of 10 wt % in paraffin wax, which are significantly superior to those of the previously reported state-of-the-art Fe3O4-based or hollow MAMs. Furthermore, the fe can be adjusted in the range of 4.5-18 GHz, covering 85% of the whole measured frequency range, via changing the thickness between 2.5 and 5.5 mm. This work offers new insights for developing advanced lightweight MAMs with strong absorption and a broad absorbing frequency range at a low filler loading.
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