21COE Programme: The Mechanical System Innovation Open Seminar 2007 will be held as
follows. Professor Hui-Ming Cheng leads several Chinese national projects in nano-materials,
nanotechnology and new energy fields, in particular, in synthesis and applications of carbon
nanotubes. His activity as editor of ‘Carbon’ is also well known. Do not miss this chance to
hear her talk in Tokyo. Participants from any departments or outside of The University of
Tokyo are welcome.
| Speaker : |
Professor Hui-Ming Cheng
(Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences) |
| Subject : |
Floating Catalyst CVD Method for Controllable Synthesis of Carbon Nanotubes |
| Date : |
February 19, 2008 (Tuesday) 15:00-16:30 (Seminar room 2-31B, Faculty of Engineering bldg.2, Hongo campus)
Map: http://www.u-tokyo.ac.jp/campusmap/cam01_04_03_e.html |
| Outline : |
Controllable synthesis of carbon nanotubes (CNTs) is the basis for their
further experimental studies and potential applications. In 1998, we demonstrated
that floating catalyst chemical vapor deposition (FCCVD) method can be used for the
continuous synthesis of SWNTs with high quality, and in 2002 we synthesized
DWNTs with this method. Furthermore, we studied the controllable synthesis of
CNTs using this method, such as the diameter and shell number. Firstly, we found
that sulfur, a commonly used growth promoter, plays an important role in the
structural control and productivity of CNTs. Secondly, we investigated the effect of
synthesis parameters on the structure of CNTs, By slightly changing the experimental
conditions, the diameters of SWNTs can be selectively controlled in a very narrow
range Thirdly, based on the experimental results and related theoretical analysis, a
localized nucleation model was proposed for the formation of SWNTs and DWNTs.
These findings are valuable for selective production of SWNTs and DWNTs.
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