Journal
MATERIALS RESEARCH BULLETIN
Volume 43, Issue 10, Pages 2697-2702Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2007.10.016
Keywords
nanostructures; chemical synthesis; electron microscopy; dielectric properties
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Funding
- National Natural Science Foundation of China [50174054]
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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. (C) 2007 Elsevier Ltd. All rights reserved.
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