Synthesis and microwave absorbing properties of SiC nanowires

SiC nanowires with high microwave absorbing performance have been prepared by one step carbon thermal reduction process with economical activated carbon, silicon and silicon dioxide as raw materials. The characterization and performance of nanowires have been studied by IR, XRD, SEM and VNA analysis. The results indicate that the obtained SiC nanowires are samples with diameter about 40nm and the length up to several micrometers. The large length-to-diameter ratio heightened the microwave absorbing properties. Electromagnetic parameters were tested with 50% of the titled materials and 50% of paraffin wax composites using HP8722ES vector network analyzer. In addition, the reflection loss property has been obtained on the basis of the transmission line theory. The results indicate that the SiC nanomaterials exhibit a maximum reflection loss of -18.02 dB with the bandwidth below -10dB over 1.7GHz, and two sharp absorbing peaks appear at 4mm thickness.