Microwave-absorbing properties of Co-filled carbon nanotubes

作者：Lin Haiyan; Zhu Hong^*; Guo Hongfan; Yu Liufang

来源：Materials Research Bulletin, 2008, 43(10): 2697-2702.

DOI：10.1016/j.materresbull.2007.10.016

• nanostructures
• chemical synthesis
• electron microscopy
• dielectric properties

Co-filled carbon nanotubes composites were synthesized via using a simple and efficient wet chemistry solution method. The samples were charactefized by transmission electron microscopy. Microwave-absorbing properties were investigated by measuring complex permittivity and complex permeability of the absorber in a frequency range of 2-18 GHz. The reflection loss (R.L.), matching frequency (f(m)) and matching thickness (d(m)) were calculated using the theory of the absorbing wall. The electromagnetic properties and microwave-absorbing characteristics effects of the modified carbon nanotubes by the encapsulation of metal Co were investigated. A matching thickness is found corresponding to a matching frequency. The maximum reflection loss is about -39.32 dB and the bandwidth corresponding to the reflection loss below -10 dB is 3.47 GHz. With increasing thickness, the maximum reflection loss shifts to lower frequency.

• 单位
  北京交通大学