Microstructure analyses of metal-filled carbon nanotubes synthesized by microwave plasma-enhanced chemical vapor deposition

Yasuhiko Hayashi, Tomoharu Tokunaga, Kenji Kaneko, Simon J. Henley, Vlad Stolojan, J. David Carey, S. R P Silva

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Pd/Co-based metal-filled carbon nanotubes (MF-CNTs) were synthesized by a microwave plasma-enhanced chemical vapor deposition method using a bias-enhanced growth technique. Pd/Co-based MF-CNTs were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) electron energy loss spectroscopy (EELS), and Raman spectroscopy. MF-CNTs were well-aligned and uniform in size on a Si substrate. Both multiwall nanotube carbon nanotubes (CNTs) and herringbone (or stacked cups structure) structures were observed. High-resolution TEM revealed that MF-CNTs were composed of highly ordered graphite layers, and the elemental maps of EELS indicate that both Co and Pd metals are present inside the nanotubes. TEM results clearly showed that both Pd and Co metals were successfully encapsulated into the CNTs. We observed a low value for the Raman intensity ratio between D (1355 cm-1) and G (1590 cm-1) bands with no shift of the G-peak position and no broadening of the G-peak, indicative of high-quality Pd/Co-based MF-CNTs. Based on TEM characterization, we propose a description for the encapsulating mechanisms.

Original languageEnglish
Article number1695946
Pages (from-to)485-490
Number of pages6
JournalIEEE Transactions on Nanotechnology
Volume5
Issue number5
DOIs
Publication statusPublished - Sep 2006
Externally publishedYes

Fingerprint

Plasma enhanced chemical vapor deposition
Carbon nanotubes
Microwaves
Microstructure
Metals
Electron energy loss spectroscopy
Transmission electron microscopy
Nanotubes
High resolution transmission electron microscopy
Raman spectroscopy
Graphite
Scanning electron microscopy
Substrates

Keywords

  • Electron energy loss spectroscopy (EELS)
  • Metal filled carbon nanotubes (CNTs)
  • Microwave plasma-enhanced chemical vapor deposition (MP-CVD)
  • Scanning electron microscopy (SEM)
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Engineering(all)
  • Hardware and Architecture

Cite this

Microstructure analyses of metal-filled carbon nanotubes synthesized by microwave plasma-enhanced chemical vapor deposition. / Hayashi, Yasuhiko; Tokunaga, Tomoharu; Kaneko, Kenji; Henley, Simon J.; Stolojan, Vlad; Carey, J. David; Silva, S. R P.

In: IEEE Transactions on Nanotechnology, Vol. 5, No. 5, 1695946, 09.2006, p. 485-490.

Research output: Contribution to journalArticle

Hayashi, Yasuhiko ; Tokunaga, Tomoharu ; Kaneko, Kenji ; Henley, Simon J. ; Stolojan, Vlad ; Carey, J. David ; Silva, S. R P. / Microstructure analyses of metal-filled carbon nanotubes synthesized by microwave plasma-enhanced chemical vapor deposition. In: IEEE Transactions on Nanotechnology. 2006 ; Vol. 5, No. 5. pp. 485-490.
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