Preparation and Microwave Absorption Properties of Magnetic Porous rGO@Co/CoO Composites

doi:10.11901/1005.3093.2021.391

Chinese Journal of Materials Research

2022, Vol. 36

Issue (5): 332-342 DOI: 10.11901/1005.3093.2021.391

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Preparation and Microwave Absorption Properties of Magnetic Porous rGO@Co/CoO Composites

LIU Jialiang¹, XU Dongwei¹, CHEN Ping¹^,²(

)

^1.State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
^2.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116024, China

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LIU Jialiang, XU Dongwei, CHEN Ping. Preparation and Microwave Absorption Properties of Magnetic Porous rGO@Co/CoO Composites. Chinese Journal of Materials Research, 2022, 36(5): 332-342.

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Abstract

Nanocomposites of reduced graphene oxide coated cobalt or cobalt oxide (rGO@Co/CoO) were synthesized by solvothermal and high-temperature calcination method with solutions of AA grade Co and graphene oxide as raw materials. The prepared products are characterized by means of XRD, Raman spectroscopy, XPS, SEM and TEM. Results show that three type of composites could be fabricated by calcination at 350, 500 and 650°C respectively, namely rGO@CoO of face-centered cubic (fcc) phase, rGO@Co of fcc phase, and rGO@Co of fcc and hcp two-phases. Among others, the fcc rGO@Co (S500) exhibits excellent electromagnetic wave absorption properties (the relevant property was measured on a hollow ring made of the paraffin filled with the composite): The hollow ring with a low mass filling ratio of 10% (mass fraction) fcc rGO@Co (S500) nanocomposite presents the minimum reflection loss (RL_min) and maximum effective absorption bandwidth (EAB), corresponding to the RL_min and EAB are -74.5 dB and 6.1 GHz, respectively for the hollow ring with a wall of 2.5 mm in thickness. We believed that the present approach may be an economic and green route for the controllable synthesis of porous functionalized graphene materials as microwave absorbers.

Key words: composite three-dimensional graphene magnetic nanoparticles electromagnetic wave absorption performance

Received: 02 July 2021

ZTFLH:

TB332

Fund: Liaoning Revitalization Talents Program(XLYC1802085);National Natural Science Foundation of China(51873109);Dalian Science and Technology Innovation Fund Project(2019J11CY007);Fundamental Research Funds for the Central Universities(DUT20TD207);Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education(KF2004)

About author: CHEN Ping, Tel: (0411)84986100, E-mail: Pchen@dlut.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.391 OR https://www.cjmr.org/EN/Y2022/V36/I5/332

Fig.1 Schematic illustration for the formation of the rGO@Co/CoO nanocomposites

Fig.2 XRD patterns of porous magnetic rGO@Co/CoO nanocomposit

Fig.3 XPS full spectrum of rGO@Co (a), Co 2p spectrum of rGO@Co (b), C 1s spectrum of rGO@Co (c) and C 1s spectrum of GO (d)

Fig.4 Raman spectra with corresponding I_D/I_G ratios of as-prepared S350, S500 and S650

Fig.5 SEM morphologies of S500 at different magnifications (a, b) and TEM morphologies of S500 at different magnifications (c, d)

Fig.6 Representation of RL values of S350 (a, b), S500 (c, d) and S650 (e, f)

Table 1 Microwave absorption performance of best microwave absorption materials reported in literatures

Fig.7 Real part (ε′) (a), imaginary part (ε″) (b) of relative complex permittivity and real part (μ′) (c) and imaginary part (μ″) (d) of relative complex permeability

Fig.8 Dielectric loss tangent (tanδ_ε ) (a) and magnetic loss tangent (tanδ_μ ) (b)

Fig.9 Cole-Cole semicircles (ε′ versus ε″) (a~c) and C₀ versus in the range of 1~18 GHz (d)

Fig.10 Impedance matchingand Attenuation constant of S350, S500, S650 composite

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