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Controllable N‑Doped Carbonaceous Composites with Highly Dispersed Ni Nanoparticles for Excellent Microwave Absorption
journal contribution
posted on 2018-09-27, 00:00 authored by Shengshuai Gao, Qingda An, Zuoyi Xiao, Shangru Zhai, Dongjiang YangMicrowave
absorption materials with great reflection loss and wide
absorption band that can provide electromagnetic waves (EMWs) absorption
with minimal thickness are highly desirable, particularly when they
could be controllably fabricated through a facile process. Herein,
N-doped three-dimensional (3D) carbonaceous composites with highly
dispersed nickel nanoparticles (N-SA/Ni-X, X = 3%, 6%, 9%) were successfully
prepared by a facile one-step encapsulation process and carbonization.
The performance of the absorber has a significant enhancement due
to the introduction of nitrogen elements into a carbon network for
controlling the dispersion and size distribution of Ni nanoparticles.
When a 6% Ni2+ mass percentage was used, the maximum reflection
loss (RL) could reach −42.2 dB at 9.8 GHz. Moreover, the effective
absorption (below −10 dB) bandwidth can be increased by 2.3
GHz, from 8.5 to 10.8 GHz, with the absorber thickness of only 2 mm,
and it can be tuned from 2.8 to 14.4 GHz by adjusting the thickness
from 1.5 to 5 mm. The excellent electromagnetic-wave-absorbing performance
could be assigned to the combinatorial advantages of the lightweight
conductive porous network with favorable dielectric loss and magnetic
loss features induced by highly dispersed Ni nanoparticles. These
newly fabricated N-SA/Ni-X composites could be regarded as promising
candidates for lightweight and high-performance microwave absorption
materials.