Generation and agglomeration behaviour of size-selected sub-nm iron clusters as catalysts for the growth of carbon nanotubes

作者：Joshi Ravi; Waldschmidt Benjamin; Engstler Joerg; Schaefer Rolf; Schneider Joerg J

来源：Beilstein Journal of Nanotechnology, 2011, 2: 734-739.

DOI：10.3762/bjnano.2.80

• carbon nanotubes
• CNT growth
• metal clusters
• size selected clusters

Mass-selected, ligand-free FeN clusters with N = 10-30 atoms (cluster diameter: 0.6-0.9 nm) were implanted into [Al@SiOx] surfaces at a low surface coverage corresponding to a few thousandths up to a few hundredths of a monolayer in order to avoid initial cluster agglomeration. These studies are aimed towards gaining an insight into the lower limit of the size regime of carbon nanotube (CNT) growth by employing size-selected sub-nm iron clusters as catalyst or precatalyst precursors for CNT growth. Agglomeration of sub-nm iron clusters to iron nanoparticles with a median size range between three and six nanometres and the CNT formation hence can be observed at CVD growth temperatures of 750 degrees C. Below 600 degrees C, no CNT growth is observed.

• 出版日期2011-11-1