Microstructure and local magnetic induction of segmented and alloyed Pd/Co nanocomposites encapsulated inside vertically aligned multiwalled carbon nanotubes

Yasuhiko Hayashi, T. Fujita, T. Tokunaga, K. Kaneko, M. Tanemura, T. Butler, N. Rupesinghe, J. D. Carey, S. R.P. Silva, K. B.K. Teo, G. A.J. Amaratunga

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have successfully synthesized the Co/Pd magnetic and nonmagnetic multisegment nanowires encapsulated inside multiwalled carbon nanotubes (MWCNTs) by using Co and Pd thin-layers deposited on Si substrate by microwave plasma enhanced chemical vapor deposition. Energy dispersive X-ray spectroscopy revealed that MWCNTs were encapsulated with Co and Pd nanowires, separately, at the tube top and the bottom of Co nanowire, respectively. The face-centered-cubic (fcc) structure of Co nanowires was confirmed by a selected area diffraction pattern. We proposed a fruitful description for the encapsulating mechanisms of both Co and Pd multisegment nanowires. The component of magnetic induction from Co region, not Pd region, was then estimated to be 1.2 ± 0.1 T, based on results of off-axis electron holography, which is lower than the expected saturation magnetization of fcc bulk Co of 1.7 T. We proposed a fruitful description for the mechanisms of reduced magnetic induction from Co nanowires.

Original languageEnglish
Pages (from-to)1525-1528
Number of pages4
JournalDiamond and Related Materials
Volume17
Issue number7-10
DOIs
Publication statusPublished - Jul 1 2008
Externally publishedYes

Keywords

  • Encapsulation of multisegments
  • Energy dispersive X-ray spectroscopy
  • Multiwalled carbon nanotubes (MWCNTs)
  • Off-axis electron holography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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    Hayashi, Y., Fujita, T., Tokunaga, T., Kaneko, K., Tanemura, M., Butler, T., Rupesinghe, N., Carey, J. D., Silva, S. R. P., Teo, K. B. K., & Amaratunga, G. A. J. (2008). Microstructure and local magnetic induction of segmented and alloyed Pd/Co nanocomposites encapsulated inside vertically aligned multiwalled carbon nanotubes. Diamond and Related Materials, 17(7-10), 1525-1528. https://doi.org/10.1016/j.diamond.2008.03.012