Selective chemical vapor deposition synthesis of double-wall carbon nanotubes on mesoporous silica.
Double-wall carbon nanotubes (DWNTs) have been selectively synthesized over Fe/Co loaded mesoporous silica by catalytic chemical vapor deposition of alcohol. Several silica materials with desired pore diameter and morphology have been investigated for the DWNT growth. The diameter distribution and selectivity of the DWNT are found to depend on the reaction temperature, pore size, and thermal stability of the support material. A high-yield synthesis of DWNTs has been achieved at 900 degrees C over high-temperature stable mesoporous silica. The outer diameter of DWNTs is found to be in the range of 1.5-5.4 nm with a "d" spacing of 0.38 +/- 0.02 nm between inner and outer layers, which is much larger than those of multiwall carbon nanotubes.
Ramesh
Palanisamy
P
CREST, Japan Science and Technology Agency, Nagoya University, Nagoya 464-8602, Japan.
Okazaki
Toshiya
T
Taniguchi
Risa
R
Kimura
Junichi
J
Sugai
Toshiki
T
Sato
Kenichi
K
Ozeki
Yuji
Y
Shinohara
Hisanori
H
D000438:Alcohols / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D006358:Hot Temperature; D007501:Iron / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D012015:Reference Standards; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods / Q000592:standards; D013499:Surface Properties; D014835:Volatilization; D014961:X-Ray Diffraction
D000438:Alcohols; D037742:Nanotubes, Carbon; D003035:Cobalt; D012822:Silicon Dioxide; D007501:Iron