Nitrogen-doped and Fe-filled CNTs/NiCo2O4 porous sponge with tunable microwave absorption performance

Lightweight, highly efficient, thermal stable microwave absorption materials are highly desirable but challenging for electromagnetic protection. Impedance matching and electromagnetic loss are two crucial factors for the microwave absorption materials design. Here, we successfully designed and synt...

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Bibliographic Details
Published inCarbon (New York) Vol. 153; pp. 737 - 744
Main Authors Hu, Qingmei, Yang, Rongliang, Mo, Zichao, Lu, Dongwei, Yang, Leilei, He, Zhongfu, Zhu, Hai, Tang, Zikang, Gui, Xuchun
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.11.2019
Elsevier BV
Subjects
Absorbers
Absorption rates
Carbon nanotubes
CNTs
Dielectric loss
Electromagnetic absorption
Electromagnetism
High temperature
Impedance matching
Lightweight
Microwave absorption
Microwaves
Nickel compounds
NiCo2O4
Nitrogen
Peak frequency
Polarization
Thermal stability
Thickness
Dielectric loss
Microwave absorption
CNTs
NiCo2O4
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Summary:Lightweight, highly efficient, thermal stable microwave absorption materials are highly desirable but challenging for electromagnetic protection. Impedance matching and electromagnetic loss are two crucial factors for the microwave absorption materials design. Here, we successfully designed and synthesized a lightweight (31.5 mg/cm3) and porous NiCo2O4@carbon nanotubes (CNTs) hybrid sponge (NiCo2O4@CNTs) based on N-doped and Fe-filled CNTs. The as-prepared NiCo2O4@CNTs shows high thermal stability (>500 °C) and excellent microwave absorption properties with a minimum reflection loss value of - 45.1 dB at 9.0 GHz for absorber thickness of 2.5 mm. Moreover, the maximum absorption peak frequency and effective microwave absorption region (<10 dB) can be controlled in the range of 4.0–16.0 GHz by varying the thickness of the absorber. The highly efficient electromagnetic absorption performance of the sponge is mainly attributed to the high dipolar polarization, interfacial polarization loss and suitable impedance matching characteristic. These results indicate that the NiCo2O4@CNTs sponge can serve as the lightweight, highly efficient, and high temperature resistant microwave absorption materials. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.07.077