Effects of catalyst film thickness on plasma-enhanced carbon nanotube growth
作者： S. Hofmann , M. Cantoro , B. Kleinsorge , C. Casiraghi , A. Parvez
DOI: 10.1063/1.1989432
关键词:
摘要: A systematic study is presented of the influence catalyst film thickness on carbon nanostructures grown by plasma-enhanced chemical-vapor deposition from acetylene and ammonia mixtures. We show that reducing Fe∕Co below 3nm causes a transition larger diameter (>40nm), bamboolike nanofibers to small (∼5nm) multiwalled nanotubes with two five walls. This accompanied more than 50 times faster growth rate poisoning. Thin Ni films only trigger such when pretreated an plasma. observe limited correlation between this coarsening before deposition. For temperature ⩽550°C, all catalysts showed mainly tip regime similar activity untreated silicon, oxidized silicon nitride support.
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