Epitaxial growth of chromium carbide nanostructures on multiwalled carbon nanotubes (MWCNTs) in MWCNT-copper composites

Seungchan Cho, Keiko Kikuchi, Takamichi Miyazaki, Akira Kawasaki, Yoshiro Arami, Jean François Silvain

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

We have, for the first time, fabricated chromium (Cr) carbide nanostructures on multiwalled carbon nanotubes (MWCNTs) in a MWCNT-copper (Cu) composite by adding small amounts of Cr. A single nanocrystal of carbide was epitaxially grown on the sidewall of chemically treated MWCNTs through the diffusion of solute Cr atoms to defects in the MWCNTs. Carbide has an island-shaped morphology with a maximum size of several hundred nanometers. The phase of the generated Cr carbide nanostructures was mostly Cr7C 3, as determined by electron beam diffraction using the nanobeam diffraction mode of a transmission electron microscope. In particular, the Cr carbide nanostructures formed at radially unzipped sites were connected to the outermost wall and some inner walls of the MWCNTs. This is expected to increase the load-bearing capacity of the MWNCTs because the inner walls contribute to the load transfer, which is very effective for improving the mechanical and thermomechanical properties of the composites.

Original languageEnglish
Pages (from-to)708-716
Number of pages9
JournalActa Materialia
Volume61
Issue number2
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Carbides
  • Carbon and graphite
  • Copper alloys
  • Crystal growth
  • Fiber-reinforced composites

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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