Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 29, Issue 1, Pages 88-93Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2019.03.013
Keywords
Co@C/C composites; Thermal decomposition; Nanoscale size; Impedance matching; Microwave absorption
Funding
- National Research Foundation of Korea (NRF) - Korean government [2018R1C1B6007453, 2016R1A2B4012847, 2013R1A4A1069528]
- National Research Council of Science and Technology (NST) grant by the Korea government (MSIT) [CRC-15-06-KIGAM]
- DGIST R&D Program of the MSIP [19-BT-02]
- National Research Foundation of Korea [2013R1A4A1069528, 2018R1C1B6007453, 2016R1A2B4012847] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Co@C core-shell nanospheres highly dispersed on carbon supports were rationally designed to improve the microwave absorbing property of the composite material, and fabricated by one pot thermal decomposition and simple annealing process. The Co nanospheres were completely encapsulated with thin carbon shells, which can effectively prevent the oxidation of the Co surface. Additionally, the particle size of Co nanospheres were properly controlled to optimize the electromagnetic property of the composite material. As a result, the light-weight Co@C/C composites with the particle size of 20 nm exhibited much enhanced microwave absorption properties. The improved microwave absorption performance is attributed mainly to the enhanced isotropic ratio and impedance matching of magnetic composites via tuning the Co particle size. Therefore, the well-designed core-shell Co@C composite structure will provide a new insight for the development of high performance microwave absorbers.
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