Intentionally encapsulated metal alloys within vertically aligned multi-walled carbon nanotube array via chemical vapor deposition technique

Hirotaka Inoue, Takeshi Nishikawa, Yasuhiko Hayashi, Masaki Hada, Tomoharu Tokunaga, G. A.J. Amaratunga, G. A.J. Amaratunga

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a growth and characterization of vertically aligned PdxCoi-x alloy encapsulated inside Multi-Walled Carbon Nanotube (MWCNT) arrays on Pd/Co thin layers coated on Si substrate by a dc bias-enhanced plasma chemical vapor deposition (CVD) method. The Metal Alloy Encapsulated within MWCNTs (MAE-MWCNTs) were characterized by a scanning electron microscope (SEM) and a transmission electron microscopy (TEM). The SEM images show the teardrop-shape particles encapsulated within the tube top of MWCNTs. A vibrating sample magnetometer was used to study the magnetism of a large number of MAE-MWCNTs on Si substrate at room temperature. The hysteresis loop of the ME-MWCNTs shows clear ferromagnetic behavior and the easy axis of magnetization is parallel to the MEA-MWCNT tube axis, as can be elucidated from the large coercive fields and remanence values. Moreover, TEM off-axis electron holograms were used to study the magnetism of the individual MAE-MWCNT or the two pair of MAE-MWCNTs. Based on electron holography, we have successfully obtained the saturation magnetization of 0.7 T and 1.12 T for the individual MAE-MWCNT with diameters of 41 nm and 83 nm, respectively.

Original languageEnglish
Title of host publicationConference Program Digest - 7th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, IEEE 3M-NANO 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages357-361
Number of pages5
Volume2018-January
ISBN (Electronic)9781538610817
DOIs
Publication statusPublished - Feb 7 2018
Event7th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, IEEE 3M-NANO 2017 - Shanghai, China
Duration: Aug 7 2017Aug 11 2017

Other

Other7th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, IEEE 3M-NANO 2017
CountryChina
CityShanghai
Period8/7/178/11/17

Keywords

  • Carbon nanotubes (CNTs)
  • Encapsulation
  • Metal alloys
  • Spintronics
  • TEM off-axis electron holograms
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Industrial and Manufacturing Engineering
  • Mechanical Engineering

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  • Cite this

    Inoue, H., Nishikawa, T., Hayashi, Y., Hada, M., Tokunaga, T., Amaratunga, G. A. J., & Amaratunga, G. A. J. (2018). Intentionally encapsulated metal alloys within vertically aligned multi-walled carbon nanotube array via chemical vapor deposition technique. In Conference Program Digest - 7th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, IEEE 3M-NANO 2017 (Vol. 2018-January, pp. 357-361). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/3M-NANO.2017.8286262