Evaluation of bimetallic catalysts for the growth of carbon nanotube forests

Hans Tornatzky, David Hardeman, Santiago Esconjauregui*, Lorenzo D'Arsié, Rongsi Xie, Hisashi Sugime, Junwei Yang, Taron Makaryan, Christian Thomsen, John Robertson

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

We systematically study the growth of carbon nanotube forests by chemical vapor deposition using evaporated monometallic or bimetallic Ni, Co, or Fe films supported on alumina. Our results show two regimes of catalytic activity. When the total thickness of catalyst is larger than nominally 1nm, bimetallic catalysts tend to outperform the equivalent layers of a single metal, yielding taller forests of multi-walled carbon nanotubes (CNTs). In contrast, for layers thinner than ~1nm, bimetallic catalysts are notably less active than individually. However, the amount of small diameter and single-walled CNTs is significantly increased. This possible transition at ~1nm might be related to different catalyst composition after annealing, depending whether or not the films overlap during evaporation and alloy during catalyst formation.

本文言語English
ページ(範囲)2605-2610
ページ数6
ジャーナルPhysica Status Solidi (B) Basic Research
250
12
DOI
出版ステータスPublished - 2013 12月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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