Abstract
An economic electromagnetic wave absorber with carbon nanocoils (CNCs)/tissue and paraffin has been successfully synthesized and exhibits excellent microwave absorption property. The CNCs/tissue composite was obtained by growing spring-like CNCs on the tissue substrate with Fe2(SO4)3/SnCl2 catalyst in a chemical vapor deposition method. It is found that the absorbers containing 10wt% and 20wt% CNCs/tissue show strong microwave absorption in a frequency range of 2–18GHz. For the composite with 10wt% CNCs/tissue, the maximum reflection loss (RL) of −46.36dB at 14.72GHz and the bandwidths of 7.44 and 5.68GHz respectively corresponding to RL below −10 and −20dB can be obtained. In addition, the composite with 20wt% CNCs/tissue can also gain broad bandwidth corresponding to reflection loss below −10dB, which is as high as 7.52GHz. It is revealed that the composite with 10wt% CNCs/tissue owns suitable real part of permittivity, which helps to obtain better impedance match and lower reflection coefficient to enhance the absorption of electromagnetic wave.
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