Abstract
SiC nanowires with different lengths were prepared, and the effect of nanowire length on their dielectric permittivity and microwave absorption properties were investigated. The results reveal that SiC nanowires with longer length can improve the electrical conductivity of microwave absorbing materials. This may be attributed to the fact that longer nanowires are more easily to interconnect with each other, which facilitates the construction of a more complete electrical conduction network in the matrix. Cole-Cole curves also indicate that with increasing nanowire length, the dominant loss mechanism of SiC nanowires is changed from polarization loss to conductance loss. Therefore, the conductivity-dependent dielectric permittivity and microwave absorbing ability of SiC nanowires were significantly improved with the increase in the nanowire lengths.
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