Synthesis, microwave electromagnetic, and microwave absorption properties of twin carbon nanocoils

Tang Nujiang*, Zhong Wei, Chak Tong AU, Yang Yi, Han Mangui, Lin Kuanjiuh, Du Youwei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

142 Citations (Scopus)

Abstract

Twin carbon nanocoils (T-CNCs) were synthesized by means of acetylene decomposition over nickel nanoparticles. From the TEM image, one can see the growth of carbon nanocoils from the opposite sides of a nickel nanodisc, making an interangle of 180°. We examined the microwave electromagnetic (EM) and microwave-absorbing properties of the as-prepared and annealed (1400 °C in Ar) T-CNCs systematically. A composite containing the as-prepared T-CNCs (15 wt %) and paraffin exhibited strong microwave absorption in a frequency range of 2 to 18 GHz. Over an absorber of double-layered composite (2.5 and 3.5 mm thickness), an absorption bandwidth of ca. 10 GHz corresponding to reflection loss below -10 dB can be obtained. We found that the magnetic parameters of the composite are low and suggest that the good absorption properties of T-CNCs should be attributed to dielectric rather than magnetic loss. It was observed that the as-prepared T-CNCs are superior to the annealed T-CNCs in microwave absorption ability, and such a phenomenon is interpreted in terms of the defect and graphitic nature of the materials. We also demonstrated that the complex permittivity and electric conductivity of T-CNCs can be controlled via annealling of T-CNCs at high temperature.

Original languageEnglish
Pages (from-to)19316-19323
Number of pages8
JournalJournal of Physical Chemistry C
Volume112
Issue number49
DOIs
Publication statusPublished - 11 Dec 2008

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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