Selective matching of catalyst element and carbon source in single-walled carbon nanotube synthesis on silicon substrates.
We have studied the compatibility of various catalysts for ethylene and ethanol chemical vapor deposition (CVD) syntheses of single-walled carbon nanotubes (SWNTs) on Si substrates. A strong selectivity between the catalyst elemental species and carbon source was found; SWNT yield for Fe (Co) catalysts was much higher for ethylene (ethanol) CVD than for ethanol (ethylene) CVD. This strong and completely opposite selectivity implies significantly different SWNT growth mechanisms for ethanol and ethylene CVD on Si substrates.
Mizuno
Kohei
K
Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Japan.
Hata
Kenji
K
Saito
Takeshi
T
Ohshima
Satoshi
S
Yumura
Motoo
M
Iijima
Sumio
S