Journal
DIAMOND AND RELATED MATERIALS
Volume 18, Issue 5-8, Pages 940-945Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2009.01.030
Keywords
carbon nanotubes; growth mechanism; chemical vapour deposition; catalyst
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We review our in-situ X-ray photoemission (XPS) and in-situ transmission electron microscopy studies which determined that the catalyst is in the metallic state for Fe. Co and Ni catalysts. We show that the existence of surface carbide phases in related catalytic reactions could account for the observation of carbide peaks in XPS. The observed catalytic activity of gold is discussed in terms of carbon solubility. reaction rates, and surface coordination numbers. (C) 2009 Elsevier B.V. All rights reserved.
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