Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 1, Pages 1222-1231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b15172
Keywords
cobalt selenides; crystalline configuration; tunable frequency absorption; microwave absorber; reflection loss
Funding
- National Natural Science Foundation of China [51920105001, 51731002, U1832138, 51971008]
- State Key Lab of Advanced Metals and Materials [2019-Z08]
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Microwave absorbing materials have attracted much attention in solving electromagnetic interference and pollution problems. Hierarchical cobalt selenides have been obtained through a facile selenization annealing process. The as prepared samples exhibit distinct reflection losses (R-L) and frequency responses via tailoring their crystalline configurations, with excellent absorption in Ku, X, or C band. All of the samples show R-L greater than or near -50 dB with effective bandwidths more than 4 GHz, indicating that they may serve as high-efficient and frequency-tunable microwave absorbers. Especially, the sample annealed at 400 degrees C shows a competitive R-L of -62.04 dB at 9.92 GHz with a thickness of 2.25 mm; meanwhile, its effective absorption bandwidth reaches 5.36 GHz with a thickness as small as 1.56 mm. The cobalt selenides as microwave absorbers exhibit a promising prospect applied in complex electromagnetic environments.
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