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General Synthesis of Two-Dimensional Porous Metal Oxides/Hydroxides for Microwave Absorbing Applications
journal contribution
posted on 2021-12-11, 15:14 authored by Min Fu, Wei Chen, Hao Yu, Meng Gao, Qingyun LiuMetal oxides/hydroxides with a two-dimensional
(2D) porous structure
have extensive applications in catalysis, microwave absorption, and
energy storage fields due to their large specific surface areas, massive
exposed active sites, and good structural integrities. Herein, a general
surfactant-assisted vapor diffusion–deposition self-assembly
method is developed to synthesize various 2D porous metal oxides/hydroxides.
Benefiting from the structure-directing effect of surfactants and
the precise tuning of nucleation and growth process that results from
this vapor diffusion–deposition strategy, a 2D porous structure
is constructed. To explore the advantages of such 2D porous structure,
electromagnetic characteristics and absorbing properties of as-obtained
materials are investigated. The minimum reflection loss (RL) of 2D
porous NiFe2O4 is −23.1 dB at 6.4 GHz,
and the effective absorption bandwidth (EAB) is 5.1 GHz. However,
the minimum RL is only −15.0 dB at 8.7 GHz and the EAB is 3.9
GHz for NiFe2O4 particles. In addition, the
as-obtained 2D porous NiFe2O4 exhibits superior
absorbing properties compared with many previously reported nickel
ferrites. Furthermore, the microwave absorbing mechanism of 2D porous
NiFe2O4 is investigated.
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good structural integritiesminimum reflection losseffective absorption bandwidth2 submicrowave absorbing mechanism4 sub2d porous structure2d porous nifemicrowave absorptionporous structureabsorbing properties4 ghz− 23− 15precise tuningobtained materialsminimum rlgrowth processgeneral synthesisgeneral surfactantextensive applicationselectromagnetic characteristicsdirecting effectassembly method9 ghz7 ghz1 ghz1 db0 db