Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 153, Issue 1-3, Pages 78-82Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2008.10.029
Keywords
Carbon nanotubes; Rare earth oxide; Electromagnetic parameters; Absorbers
Funding
- National Natural Science Foundation of China [50674006]
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Multi-walled carbon nanotubes (MWCNTs) filled with Er2O3 were synthesized by wet chemical method. Their electromagnetic characteristics and microwave absorbing properties were investigated in the frequency range of 2-18 GHz. The complex permittivity and electric loss tangent of Er2O3-filled MWCNTs demonstrate a decreasing trend while the complex permeability and magnetic loss tangent are larger than those of the unfilled MWCNTs. The Er2O3 nanoparticles encapsulated in the cavities modulate the electromagnetic parameters of MWCNTs, and thus affect the microwave absorbing properties. The modified MWCNTs possess much broader absorbing bandwidth and larger reflectivity than those of unfilled MWCNTs. With the increase of thickness, the peak value of reflectivity shifts to lower frequencies and multiple absorbing peaks appear. The result of calculation indicates that Er2O3-filled MWCNTs have potential applications in thin thickness and light-weight microwave absorbers. (C) 2008 Elsevier B.V. All rights reserved.
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