Journal
NANOTECHNOLOGY
Volume 29, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aaa52f
Keywords
FeCo; core-shell nanoparticles; chemical vapor deposition; microwave absorption
Funding
- National Natural Science Foundation of China [11674399, 11502080]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC201718]
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FeCo-C core-shell nanoparticles (NPs) with diameters of 10-50 nm have been fabricated on a large scale by one-step metal-organic chemical vapor deposition using the mixture of cobalt acetylacetonate and iron acetylacetonate as the precursor. The Fe/Co molar ratio of the alloy nanocores and graphitization degree of C shells, and thus the magnetic and electric properties of the core-shell NPs, can be tuned by the deposition temperature ranging from 700 degrees C to 900 degrees C. Comparative tests reveal that a relatively high Fe/Co molar ratio and low graphitization degree benefit the microwave absorption (MA) performance of the core-shell NPs. The composite with 20 wt% core-shell NP obtained at 800 degrees C and 80 wt% paraffin exhibits an optimal reflection loss (RL) of -60.4 dB at 7.5 GHz with a thickness of 3.3 mm, and an effective absorption bandwidth (frequency range for RL <= 10 dB) of 9.2 GHz (8.8-18.0 GHz) under an absorber thickness of 2.5 mm. Our study provides a facile route for the fabrication of alloy-C core-shell nanostructures with high MA performance.
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