Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9801364 | Science and Technology of Advanced Materials | 2005 | 7 Pages |
Abstract
The synthesis of carbon nanotubes (CNTs) and carbon nanofilaments (CNFs) was investigated using the catalytic decomposition of acetylene over alumina-supported palladium catalysts prepared with the impregnation of palladium acetylacetonate (Pd/Al2O3) and deposition of dodecanethiol-protected palladium nanoparticles (DT-Pd/Al2O3). The synthesized carbon products consisted of multi-walled carbon nanotubes together with a significant number of CNFs. At 700 °C over Pd/Al2O3, the carbon products were mainly made up of CNFs in the range of 9-26 nm in diameter, while CNTs with well-defined layer structures were synthesized at 800 °C. When Pd loading was 0.5 wt.%, carbon tubules showed better crystallinity than those of 2.5 wt.% at 700 °C. DT-Pd/Al2O3, showing better dispersion of DT-Pd nanoparticles, showed narrower size-distribution of CNTs than that of Pd/Al2O3. Over several supports (Al2O3, SiO2-Al2O3, SiO2, and Y) with DT-Pd nanoparticles, we obtained amorphous carbon-free CNTs showing a narrower diameter range of 6-21 nm at 700 °C.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Seung-Yup Lee, Mami Yamada, Mikio Miyake,