Facile chemical synthesis, electromagnetic response, and enhanced microwave absorption of cobalt powders with controllable morphologies.
Spherical (sample A), chain-like (sample B), and flake-like (sample C) cobalt powders are synthesized on a large scale through simple chemical liquid reduction method. Based on uniformly dispersing samples into a paraffin matrix, morphology-dependent electromagnetic responses in GHz range, including permittivity and permeability, are investigated for these three cobalt powders in the microwave frequency of 2-18 GHz. The calculated reflection loss (RL) indicates as-prepared samples have potential application as a candidate for microwave absorption. The maximum RL of sample A is -15.28 dB at 12.85 GHz with a matching thickness of 2.5 mm. The maximum RL of sample B is -28.05 dB at 5.74 GHz corresponding to a thickness of 2.0 mm, and the maximum RL of sample C is -41.17 dB at 5.10 GHz with a thickness of 2.5 mm. Mechanism of morphology-dependent electromagnetic response and microwave absorption of the Cobalt powders is also discussed in this paper.
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
S L
SL
Wen
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
Y
Y
Liu
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
X C
XC
Zhao