1998 Fiscal Year Final Research Report Summary
Growth Mechnism of Carbon Nanotubes
| Project/Area Number |
09450013
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Meijo University |
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Principal Investigator |
ANDO Yoshinori Meijo Univ., Fac.of Science & Tech., Prof., 理工学部, 教授 (30076591)
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| Co-Investigator(Kenkyū-buntansha) |
OHKOHCHI Masato Meijo Univ., Fac.of Science & Tech., Assist.Prof., 理工学部, 助教授 (50076626)
OKAZAKI Tsugio Meijo Univ., Fac.of Science & Tech., Assist.Prof., 理工学部, 助教授 (60076619)
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| Project Period (FY) |
1997 – 1998
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| Keywords | multiwalled carbon nanotubes / arc discharge in hydrogen gas / purification by heating in air / morphology / scanning electron microscopy / transmission electron microscopy / optical spectroscopy / analysis of gas composition |
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| Research Abstract |
We made clear that multiwalled carbon nanotubes could be prepared by DC arc evaporation of graphite rods in atmospheric gas as cathode deposit, after 1991. When we changed the kind of atmospheric gas, different kinds of morphology could be observed by scanning electron microscopy or transmission electron microscopy. When we used pure hydrogen gas as atmospheric gas, high, quality multiwalled carbon nanotubes with less co-existing carbon nanoparticles could be obtained (1997). Thus, if co-existing carbon nanoparticles were less originally, it is easy to remove co-existing carbon nanoparticles and to purify. In fact, we could get purified maltiwalled carbon nanotubes by simple physical method, namely by irradiating the specimen in air (1998) by infrared radiation heater at 500ﾟC for 30min.
When we evaporated the graphite electrode in pure hydrogen gas, we could get maltiwalled carbon nanotubes having extremely narrow inner tube of the diameter 1.0nm in the order. The inner tube was surrounded by graphene sheets of equal distance, 0.34nm, and with high crystalline. In order to clarify the reason why pure hydrogen gas is appropriate for production of high quality multiwalled carbon nanotubes, we analyzed the optical emission of arc discharge. As the result, the existence of much H atoms and CH molecules in atmospheric gas including H atoms, such as H2 or CH4. Especially, it seems that the existence of CH molecules affects strongly for the growth of edge of graphene sheets. However, the CH molecules can not be found by a composite analysis of gas after cooling.
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