Electromagnetic Properties of Novel Carbon Nanofibers

doi:10.3724/SP.J.1077.2013.12261

Abstract

Abstract:

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 electron 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 characteristics of the CBC/Fe₃O₄complex 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.

Key words: bacterial cellulose, carbon nanofibers, net-linked structure, electromagnetic properties

CLC Number:

O441

WANG Gai-Hua, DAI Bo, MA Yong-Jun, REN Yong. Electromagnetic Properties of Novel Carbon Nanofibers[J]. Journal of Inorganic Materials, 2013, 28(4): 398-402.

Figures/Tables 4

Fig. 1 XRD pattern (a) and Raman spectrum (b) of the products from BC carbonized at 800℃

Fig. 2 SEM image of BC (a), TEM image of the product from BC carbonized at 800℃ (b) and HRTEM image (c) of the areas marked by square in Fig. 2 (b)

Fig. 3 Complex permittivity (a) and dielectric loss (b) of sample S1 plotted against frequency

Fig. 4 (a) TEM image of Fe3O4 nanoparticles. Inset is the magnetization loop at room temperature; The complex permittivity (b), complex permeability (c) and reflection loss (d) of sample S2 and S3 plotted against frequency

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