title: Generation and agglomeration behaviour of size-selected sub-nm iron clusters as catalysts for the growth of carbon nanotubes.
abstract: Mass-selected, ligand-free Fe(N) clusters with N = 10-30 atoms (cluster diameter: 0.6-0.9 nm) were implanted into [Al@SiO(x)] 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 °C. Below 600 °C, no CNT growth is observed.
authors.affiliation: Department of Chemistry, Eduard-Zintl-Institute, Inorganic Chemistry, Technische Universität Darmstadt, Petersenstr. 18, 64287 Darmstadt, Germany, , Tel: +49-6151-16-3225.
authors.forename: Ravi
authors.initials: R
authors.lastname: Joshi
authors.affiliation: Department of Chemistry, Eduard-Zintl-Institute, Physical Chemistry, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany, , Tel: +49-6151-16-2498.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Waldschmidt
authors.affiliation: Department of Chemistry, Eduard-Zintl-Institute, Inorganic Chemistry, Technische Universität Darmstadt, Petersenstr. 18, 64287 Darmstadt, Germany, , Tel: +49-6151-16-3225.
authors.forename: Jörg
authors.initials: J
authors.lastname: Engstler
authors.affiliation: Department of Chemistry, Eduard-Zintl-Institute, Physical Chemistry, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany, , Tel: +49-6151-16-2498.
authors.forename: Rolf
authors.initials: R
authors.lastname: Schäfer
authors.affiliation: Department of Chemistry, Eduard-Zintl-Institute, Inorganic Chemistry, Technische Universität Darmstadt, Petersenstr. 18, 64287 Darmstadt, Germany, , Tel: +49-6151-16-3225.
authors.forename: Jörg J
authors.initials: JJ
authors.lastname: Schneider