title: Synthesis, dual-nonlinear magnetic resonance and microwave absorption properties of nanosheet hierarchical cobalt particles.
abstract: In this paper, we report the synthesis of three kinds of novel nanosheet hierarchical cobalt particles by adjusting the [C4H4O6](2-)/Co(2+) ratio through a liquid reduction method. We investigated the electromagnetic properties of the cobalt particles in detail over the microwave frequency range of 1-18 GHz. The results show that the real part of the permittivity decreases and the imaginary part of the permeability increases with an increase in the [C4H4O6](2-)/Co(2+) ratio. The permeability displays two resonance peaks over the frequency range. The cobalt particles with [C4H4O6](2-)/Co(2+) = 6 have a maximum reflection loss of -48.03 dB at 13.61 GHz, and the effective absorption bandwidth (RL ≤ -10 dB) is 6.76 GHz corresponding to a thickness of 1.7 mm. Considering the impedance matching and attenuation based on the electromagnetic parameters, we designed a way to obtain cobalt particles with excellent microwave absorption properties by decreasing the real part of permittivity and increasing the imaginary part of permeability.
authors: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China. abc.1984816@163.com.
authors: S L
authors: SL
authors: Wen
authors: Y
authors: Y
authors: Liu
authors: X C
authors: XC
authors: Zhao
authors: J W
authors: JW
authors: Cheng
authors: H
authors: H
authors: Li
mesh_terms: D065638:Absorption, Radiation; D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D060526:Magnetic Fields; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008872:Microwaves; D017711:Nonlinear Dynamics; D010316:Particle Size; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D003035:Cobalt