Synthesis of zinc oxide particles coated multiwalled carbon nanotubes: Dielectric properties, electromagnetic interference shielding and microwave absorption

Wei Li Song, Mao Sheng Cao*, Bo Wen, Zhi Ling Hou, Jin Cheng, Jie Yuan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)

Abstract

Zinc oxide (ZnO) nanoparticles were coated on the surfaces of multiwalled carbon nanotubes (MWCNTs). High resolution transmission electron microscopy images show that the wurtzite ZnO immobilized on the MWCNTs is single-crystalline with a preferential [0 0 0 2] growth direction. A capacitor was generated by the interface of ZnO and MWCNTs, and a resistor-capacitor model could well describe the relationships between the structure and the dielectric properties, electromagnetic interference shielding and microwave-absorption of the composites in the frequency range of 2-18 GHz. The network built by ZnO-immobilized MWCNTs could contribute to the improvement of electrical properties. Resonant peaks associated with the capacitor formed by the interface were observed in the microwave absorption spectra, which suggest that reflection-loss peaks greatly broadens the absorption bandwidth.

Original languageEnglish
Pages (from-to)1747-1754
Number of pages8
JournalMaterials Research Bulletin
Volume47
Issue number7
DOIs
Publication statusPublished - Jul 2012

Keywords

  • A. Composites
  • A. Interface
  • B. Chemical synthesis
  • C. Electron microscopy
  • D. Dielectric properties

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