Electromagnetic Properties of Novel Carbon Nanofibers

Carbonized bacterial cellulose (CBC) with a three dimensional net-linked framework were synthesized from carbonized bacterial cellulose and investigated by X-ray diffraction, Raman spectrum and Transmission elec- tron microscopy. The complex permittivity and permeability of CBC/paraffin wax composite with certain ratio of the composite were measured by vector network analysis in the frequency range of 0.1-18 GHz. It is found that the composite has high permittivity and dielectric loss, especially at the low frequency. The electromagnetic character- istics of the CBC/Fe3O4 complex absorbers synthesized by mixing a small quantity of CBC with Fe3O4 were also studied, aiming at improving the microwave absorbing properties of Fe3O4/Wax composite. When the sample's thickness was 1.2 mm, the reflection loss reached a minimal value of -21 dB for CBC - Fe3O4/Wax and of -2 dB for Fe3O4/Wax as well.