Millimeter-tall carbon nanotube arrays grown on aluminum substrates

Shota Miura, Yu Yoshihara, Mayu Asaka, Kei Hasegawa, Hisashi Sugime, Aun Ota, Hisayoshi Oshima, Suguru Noda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Millimeter-tall vertically aligned carbon nanotubes (VA-CNTs) were grown directly on Al substrates. Atmospheric pressure chemical vapor deposition is performed at 600 °C, which is well below the melting point of Al (660 °C), using Fe catalyst and C2H2 as a highly reactive carbon feedstock. The CNT height was sensitive to the C2H2 concentration and 0.06 vol% was optimum for balanced growth rate and catalyst lifetime, yielding 0.06 mm-tall VA-CNTs in 2 h. The CO2 addition at 1.8 vol% to the C2H2/Ar gas significantly enhanced the CNT growth, yielding 1.1 mm-tall VA-CNTs in 12 h. CO2 shows this remarkable effect when added in large excess to C2H2, differently from the well-known method of “small addition of water.” Moreover, the resulting VA-CNTs showed electrical contact with the Al sheets with resistance of ≤0.7 Ω cm−2. The effect of CO2 is systematically studied and discussed.

Original languageEnglish
Pages (from-to)834-842
Number of pages9
JournalCarbon
Volume130
DOIs
Publication statusPublished - 2018 Apr 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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