title: Synthesis of single-walled carbon nanotubes through micropores of surface-treated zeolites by catalyst-supported chemical vapor deposition.
abstract: Cobalt nanoparticle-loaded Y-type zeolite (HSZ390HUA) without outer-surface Co aggregates is successfully prepared by Co impregnation reaction followed by surface treatment using tetraethylammoniumbromide having larger molecule size than the orifice size of the Y-type zeolite. Single-wall carbon nanotubes (SWCNTs) have been synthesized by ethanol catalyst-supported chemical vapor deposition at 973 K for 10 min using as-produced and surface-treated Co-loaded zeolites. The SWCNTs synthesized are characterized by transmission electron microscopy, Raman spectroscopy and photoluminescence spectroscopy. The products synthesized by using the as-produced Co-loaded zeolites are mostly multi-wall carbon nanotubes (MWCNTs) with larger diameter than the orifice of zeolite and carbon nanocapsules (CNCs). In contrast, SWCNTs with diameters of 0.66-0.85 nm, which are approximately the same as that of the orifice size, are selectively synthesized by using the surface-treated Co-loaded zeolites.
authors.affiliation: Department of Chemistry, Nagoya University, Nagoya, 464-8062, Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Ryo
authors.initials: R
authors.lastname: Kitaura
authors.forename: Hisanori
authors.initials: H
authors.lastname: Shinohara