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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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Cite this article:
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 (RLmin) and maximum effective absorption bandwidth (EAB), corresponding to the RLmin 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.
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Received: 02 July 2021
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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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