Electromagnetic and microwave absorbing properties of Co-filled carbon nanotubes
Electromagnetic and microwave absorbing properties of Co-filled carbon nanotubes
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DOI：
10.1016/j.jallcom.2010.06.122
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发表时间：
2010-09-03
影响因子：
6.2
通讯作者：
Shen, Zeng-Min
中科院分区：
文献类型：
--
作者：
Zhao, Dong-Lin;Zhang, Ji-Ming;Shen, Zeng-Min
研究了钴填充碳纳米管的吸波性能、复介电常数和磁导率。采用湿化学法在碳纳米管中填充Co纳米粒子。与碳纳米管相比，真实的部分（epsilon '）和虚部复介电常数以及介电损耗因子的（ε“）（tan δ（ε）= ε“/ε”）小得多，而复磁导率的真实的部分（μ“）和虚部分（μ”）以及磁耗散因子（tan δ（μ）= μ“/μ”）更大。在10.8- 14.2GHz频率范围内，复合材料的反射损耗小于10 dB（90%吸收），在12.2GHz频率范围内，复合材料的最小反射损耗为-21.84dB。钴填充碳纳米管/环氧树脂复合材料的微波吸收增强归因于介电和磁损耗。通过在碳纳米管中填充Co纳米粒子，使碳纳米管/环氧树脂复合材料的微波吸收峰向高频移动。与碳纳米管相比，钴填充碳纳米管中钴纳米颗粒与碳纳米管内表面之间存在更多的界面。因此，界面多极有助于钴填充碳纳米管/环氧树脂复合材料的吸收。(c)2010年爱思唯尔。All rights reserved.
Microwave absorbing property, complex permittivity and permeability of the Co-filled carbon nanotubes (CNTs) have been investigated. CNTs were filled with Co nanoparticles via a wet-chemical method. Compared with the CNTs, the real part (epsilon') and imaginary part (epsilon '') of the complex permittivity as well as the dielectric dissipation factor (tan delta(epsilon) = epsilon ''/epsilon') of the Co-filled CNTs were much smaller, while the real part (mu') and imaginary part (mu '') of the complex permeability and the magnetic dissipation factor (tan delta(mu) = mu ''/mu') were greater. The Co-filled CNT/epoxy composites achieved a reflection loss below 10 dB (90% absorption) at 10.8-14.2 GHz, and the minimum value was -21.84 dB at 12.2 GHz. The microwave enhancement absorption of the Co-filled CNT/epoxy composites was attributed to both dielectric and magnetic losses. The microwave absorbing peak of the CNT/epoxy composites moved to the higher frequency by filling the Co nanoparticles into the CNTs. Compared with the CNTs, there are more interfaces between the Co nanoparticles and CNT inner surfaces in the Co-filled CNTs. Therefore, interfacial multipoles contributed to the absorption of the Co-filled CNT/epoxy composites. (c) 2010 Elsevier By. All rights reserved.