Synthesis of single-walled carbon nanotubes through micropores of surface-treated zeolites by catalyst-supported chemical vapor deposition.
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.
Kobayashi
Keita
K
Department of Chemistry, Nagoya University, Nagoya, 464-8062, Japan.
Kitaura
Ryo
R
Shinohara
Hisanori
H