Cobalt-filled apoferritin for suspended single-walled carbon nanotube growth with narrow diameter distribution.
Cobalt-filled apoferritin (Co-ferritin) was, for the first time, used as a wet catalyst for the synthesis of single-walled carbon nanotubes (SWNTs) with narrow diameter distribution. Co-ferritins were spin-coated and converted to cobalt nanoparticles by calcination. Using chemical vapor deposition, suspended networks of SWNTs were formed on pillar-structured substrates. The suspended SWNTs show narrow tube diameter distribution with a relatively good graphite structure. By virtue of the low diffusion coefficient of cobalt, Co-ferritin might be more useful for narrow diameter SWNTs growth than ferritins, which encase iron particles.
Jeong
Goo-Hwan
GH
NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan. jeong@will.brl.ntt.co.jp
Yamazaki
Akira
A
Suzuki
Satoru
S
Yoshimura
Hideyuki
H
Kobayashi
Yoshihiro
Y
Homma
Yoshikazu
Y
D000818:Animals; D001052:Apoferritins / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005293:Ferritins / Q000737:chemistry; D006736:Horses; D007501:Iron / Q000737:chemistry; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
D037742:Nanotubes, Carbon; D003035:Cobalt; D005293:Ferritins; D001052:Apoferritins; D007501:Iron