| Project/Area Number |
15310072
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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 |
Nanostructural science
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| Research Institution | Mie University |
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Principal Investigator |
KOKAI Fumio Mie University, Faculty of Engineering, Department of Chemistry for Materials, Professor, 工学部, 教授 (40345997)
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| Co-Investigator(Kenkyū-buntansha) |
KOSHIO Akira Mie University, Faculty of Engineering, Department of Chemistry for Materials, Research Assistant, 工学部, 助手 (70362358)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2004: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥10,700,000 (Direct Cost: ¥10,700,000)
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| Keywords | Laser vaporization / Nanoparticle / Nanocarbon / Polyhedron / Nanocomposite / Graphite / Metal / Growth dynamics / 触媒金属 / カーボン / ナノ物質 / 高温状態 |
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| Research Abstract |
Laser vaporization of carbon materials in high pressure inert gas (up to 0.9 MPa) can produce novel nanocarbon. Confining laser-vaporized carbon and maintaining its high temperature result in the growth of various nanocarbon. We have conducted the fabrication of polyhedral graphite (PG) particles of 100-1000 nm with a high yield (>90%) through thermal graphitization. We have also succeeded in generating nitrogen or fluorine containing PG. For laser vaporization, the laser beam from a continuous wave Nd:YAG laser was focused onto a graphite target in a chamber filled with N_2 or CF_4 gas of 0.9 MPa. Incorporations of 3 or 1 at. % of N or F atoms in PG were found from x-ray photoelectron spectroscopy. We also found the enhanced formation of PG and balloon-like carbon particles achieved by the coexistence of 1 at.% silicon.
Metals of ten elements were laser-vaporized with carbon for 2 s into an Ar gas atmosphere. The products obtained were hybridized single-wall carbon nanohorn (SWNH) particles and other nanocarbon materials. Controlling the Ar gas pressure and the element content in a laser-irradiation graphite target for Fe, Co, Ni, Cu, and Ag enabled us to fabricate SWNH particles including metal- or carbide-containing carbon nanocapsules (CNCs) with the high yield of approximately 70%. Under the same processing conditions, B, Al, Si, Y, and Gd did not form hybridized SWNH particles and formed multi-wall carbon nanotubes (MWNTs), carbide wires, etc. We investigated the metal-dependent and high-yield growth of the hybrid structure of the SWNH particle and the CNC. Laser vaporization of metal was also useful to produce nanocarbon composites. MWNTs were modified by laser vaporization of Cu and Ti.
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