Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

Song Bi*, Xunjia Su, Genliang Hou, Chaohui Liu, Wei Li Song, Mao Sheng Cao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al2O3) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al2O3 composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al2O3 composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al2O3 were found to demonstrate strong microwave absorption in the investigated region.

Original languageEnglish
Pages (from-to)5979-5983
Number of pages5
JournalCeramics International
Volume39
Issue number5
DOIs
Publication statusPublished - Jul 2013

Keywords

  • Ceramic composite
  • Microwave absorption
  • Percolation threshold
  • Shortened carbon nanotube

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