Tailoring the morphology of carbon nanotube assemblies using microgradients in the catalyst thickness

Yosuke Shiratori, Koji Furuichi, Yoshiko Tsuji, Hisashi Sugime, Suguru Noda

Research output: Contribution to journalArticle

Abstract

In addition to the structural control of individual carbon nanotubes (CNTs), the morphological control of their assemblies is crucial to realize miniaturized CNT devices. Microgradients in the thickness of catalyst are used to enrich the variety of available self-organized morphologies of CNTs. Microtrenches were fabricated in gate/spacer/cathode trilayers using a conventional self-aligned top-down process and catalyst exhibiting a microgradient in its thickness was formed on the cathode by sputter deposition through gate slits. CNTs, including single-walled CNTs, of up to 1μm in length were grown within 5-15 s by chemical vapor deposition. The tendency of thin CNTs to aggregate caused interactions between CNTs with different growth rates, yielding various morphologies dependent on the thickness of the catalyst. The field emission properties of several types of CNT assemblies were evaluated. The ability to produce CNTs with tailored morphologies by engineering the spatial distribution of catalysts will enhance their performance in devices.

Original languageEnglish
Article number095101
JournalJapanese Journal of Applied Physics
Volume50
Issue number9 PART 1
DOIs
Publication statusPublished - 2011 Sep
Externally publishedYes

Fingerprint

assemblies
Carbon nanotubes
carbon nanotubes
catalysts
Catalysts
Cathodes
cathodes
Sputter deposition
Single-walled carbon nanotubes (SWCN)
Field emission
Spatial distribution
Chemical vapor deposition
spacers
slits
field emission
spatial distribution
tendencies
vapor deposition
engineering

ASJC Scopus subject areas

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

Cite this

Tailoring the morphology of carbon nanotube assemblies using microgradients in the catalyst thickness. / Shiratori, Yosuke; Furuichi, Koji; Tsuji, Yoshiko; Sugime, Hisashi; Noda, Suguru.

In: Japanese Journal of Applied Physics, Vol. 50, No. 9 PART 1, 095101, 09.2011.

Research output: Contribution to journalArticle

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