期刊
COMPOSITES PART B-ENGINEERING
卷 182, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2019.107614
关键词
Electromagnetic wave absorption; 3D foam; Interpenetrating network; Impedance matching; Solution combustion synthesis
资金
- National Natural Science Foundation of China [51503160, 51873166, 51873165]
- Science and Technology Innovation Major Projects of Hubei Province [2019AAA035]
- Program of Hubei Technology Innovation -International Collaboration [2017AHB065]
- Applied Fundamental Research Program of Wuhan Science and Technology Bureau [2017060201010165]
- Wuhan Advanced Fiber Engineering Technology Research Center
- Hubei Province Central Government Guides Local Science and Technology Development Projects [2018ZYYD057]
Electromagnetic (EM) waves absorbing materials with lightweight and unique 3D porous structure have been receiving greater attention due to their excellent EM shielding effects. Here, a low density, high porosity Ni/rGO composite foam has been facilely obtained by a combination of solution combustion, freeze-drying and high temperature annealing. The resulting Ni/rGO foam exhibits an interpenetrating network consisting of a 3D nickel skeleton and continuous rGO sheets. This unique configuration endows the foam excellent EM wave attenuation with a density of 38.54 mg/cm(3) and a porosity of 96.74%. The foam achieves a maximum reflection loss (RL) as high as -53.11 dB covering a bandwidth of 4.91 GHz for a thickness of 4.5 mm showing satisfying impedance matching. In addition, multiple loss mechanisms have been demonstrated in the Ni/rGO foam, including Debye dipole relaxation, conduction loss, interfacial polarization, ferromagnetic natural resonance, and multiple reflections resulted from this hierarchically porous structure. In short, the study provides a novel, economical, and efficient way to obtain 3D EM wave absorbing materials.
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