High temperature in-situ observations of multisegmented metal nanowires encapsulated within carbon nanotubes by in-situ filling technique

Yasuhiko Hayashi, Tomoharu Tokunaga, Toru Iijima, Takuya Iwata, Golap Kalita, Masaki Tanemura, Katsuhiro Sasaki, Kotaro Kuroda

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Multi-segmented one-dimensional metal nanowires were encapsulated within carbon nanotubes (CNTs) through in-situ filling technique during plasma-enhanced chemical vapor deposition process. Transmission electron microscopy (TEM) and environmental TEM were employed to characterize the as-prepared sample at room temperature and high temperature. The selected area electron diffractions revealed that the Pd4Si nanowire and face-centeredcubic Co nanowire on top of the Pd nanowire were encapsulated within the bottom and tip parts of the multiwall CNT, respectively. Although the strain-induced deformation of graphite walls was observed, the solid-state phases of Pd4Si and Co-Pd remain even at above their expected melting temperatures and up to 1,550 ± 50 °C. Finally, the encapsulated metals were melted and flowed out from the tip of the CNT after 2 h at the same temperature due to the increase of internal pressure of the CNT.

Original languageEnglish
Article number448
JournalNanoscale Research Letters
Volume7
DOIs
Publication statusPublished - Sep 17 2012
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Encapsulation
  • Environmental TEM
  • In-situ filling method
  • Melting temperature
  • Metal nanowires
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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