Synthesis of Ni nanowire-encapsulated carbon nanotubes

Masaki Tanemura, Kazuki Iwata, Kazuki Wakasugi, Yoshiyuki Yamamoto, Yasutaka Fujimoto, Lei Miao, Sakae Tanemura, Ryuta Morishima

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A novel method for synthesizing nanowire-encapsulated carbon nanotubes (CNTs) under a high-vacuum ambient is demonstrated. A mixture of acetylene (C2H2) and ammoniac (NH3) gases was effused through a molecular beam (MB)-nozzle onto a small area of a Ni mesh sample heated at 580°C using a newly developed MB-chemical vapor deposition (CVD) system. The densely distributed CNTs, which grew by the thermal decomposition of gases on the intensely gas-effused area, were almost identical in diameter (∼9 nm) despite a large difference in length (0.1-1 μm), and were almost completely filled with a single Ni nanowire of 6 nm in diameter. CNTs with discontinuous filling or those without filling were not observed. On the basis of the detailed transmission electron microscopy (TEM), the base growth mode accompanied by the diffusion of catalyst Ni atoms toward the growth sites was proposed to account for an extremely high rate of filling with nanowire into CNTs.

Original languageEnglish
Pages (from-to)1577-1580
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number4 A
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Carbon nanotubes
  • Chemical vapor deposition
  • Growth
  • Molecular beam
  • Nanowire
  • Ni

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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