期刊
CARBON
卷 50, 期 8, 页码 2953-2960出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.02.065
关键词
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资金
- MEXT, Japan [18686062, 19054003, 21686074]
- PRESTO through JST, Japan [3130]
- Global COE Program for Chemistry Innovation
- ALCA through JST, Japan
- Grants-in-Aid for Scientific Research [18686062, 21686074] Funding Source: KAKEN
Vertically-aligned carbon nanotubes (VA-CNTs) were rapidly grown from ethanol and their chemistry has been studied using a cold-gas chemical vapor deposition (CVD) method. Ethanol vapor was preheated in a furnace, cooled down and then flowed over cobalt catalysts upon ribbon-shaped substrates at 800 degrees C, while keeping the gas unheated. CNTs were obtained from ethanol on a sub-micrometer scale without preheating, but on a millimeter scale with preheating at 1000 degrees C. Acetylene was predicted to be the direct precursor by gas chromatography and gas-phase kinetic simulation, and actually led to millimeter-tall VA-CNTs without preheating when fed with hydrogen and water. There was, however a difference in CNT structure, i.e. mainly few-wall tubes from pyrolyzed ethanol and mainly single-wall tubes for unheated acetylene, and the by-products from ethanol pyrolysis possibly caused this difference. The cold-gas CVD, in which the gas-phase and catalytic reactions are separately controlled, allowed us to further understand CNT growth. (C) 2012 Elsevier Ltd. All rights reserved.
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