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Synthesis of carbon nanotube films by thermal CVD in the presence of supported catalyst particles. Part II: the nanotube film

Artikel i övriga tidskrifter
Författare Yiming Yao
Lena K. L. Falk
Raluca Elena Morjan
O.A. Nerushev
Eleanor E B Campbell
Publicerad i Journal of Materials Science: Materials in Electronics
Volym 15
Nummer/häfte 9
Sidor 583-594
Publiceringsår 2004
Publicerad vid Institutionen för fysik (GU)
Sidor 583-594
Språk en
Ämneskategorier Elektronik, Funktionella material, Övrig teknisk materialvetenskap

Sammanfattning

Carbon nanotube films have been grown at 750° and 900 °C by thermal chemical vapor deposition (CVD) with acetylene (C2H2) and hydrogen on silicon (0 0 2) wafers supporting preformed (Fe,Si)3O4 particles. The reduction of the (Fe,Si)3O4 particles during CVD at 750 °C was accompanied by a disintegration leading to the formation of a high density of smaller (predominantly 5–15 nm) iron silicide (α1-Fe2Si) particles that catalyzed the growth of a dense and aligned multi-wall carbon nanotube film. The tubes did not contain any inclusions apart from the catalytic particles present in the bottom part of the film, and it was concluded that the nanotubes grew via a “base-growth” mechanism. CVD at 900 °C resulted in a random growth of predominantly multi-wall carbon nanotubes. The film contained an increased number of amorphous carbon, or graphite, clusters containing particles that had been carbonized, the larger ones to cementite, θ-Fe3C. Nanotubes were observed to grow from some of these clusters. Multi-wall carbon nanotube tips contained after CVD at 900 °C encapsulated θ-Fe3C, or in a few cases α- or γ-Fe, particles.

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