Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 16, Pages 18952-18963Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04185
Keywords
Fe3O4 nanoparticles; polymeric microcapsules; hollow carbon microspheres; hierarchical micro/nanostructures; microwave absorption
Funding
- 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]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available