2007 Fiscal Year Final Research Report Summary
Resonant Raman Scattering of Single Walled Carbon Nanotubes by the two-laser irradiation method
| Project/Area Number |
18540318
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Osaka University |
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Principal Investigator |
INOUE Koichi Osaka University, The Institut of Scientific and Industrial Research, Associate Professor (50159977)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Carbon Nanotubes / Raman Scattering / Electronic States |
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| Research Abstract |
Optical transitions between electronic bands in single-walled carbon nanotubes (SWNTs) shows intense resonant behavior due to spike-like structures in the electronic density of states relating to the one-dimensional nanotube structures. Since the resonance energies depend on the chiralities of SWNT, monochromatic laser light will excite only the SWNTs with the corresponding chirality. Resonant Raman scattering can be observed accompanying such band-to-band resonance, and the chirality can be roughly determined from the combination of the resonance energy and the phonon energy of a radial breathing mode in SWNT. In this study, while a laser light excites the electronic states in SWNTs with specific chirality, resonant Raman scattering is studied by another laser light in order to clarify the processes induced in the SWNTs by the first laser irradiation. As the results, in the most remarkable case, SWNTs are decreased by the infrared pulse laser which excites the second electronic bands in semiconducting SWNTs has been observed in the resonant Raman spectra by the visible laser that has the energy corresponding to the third-band transitions. Some new results about the chirality-selective reduction processes have been obtained, and for example, the threshold IR, laser power, reduction rates, and reduction amounts have been clarified. Although some improvements in the accuracy of the Raman scattering experiments are necessary, the two-laser irradiation method will be promising for the clarification and selection of the chiralities of SWNTs.
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[Journal Article] Formation of single quantum dot in single-walled carbon nanotube channel using focused-ion-beam technique2007
Author(s)
K., Maehashi, H., Ozaki, Y., Ohno, K., Inoue, K., Matsumoto, S., Seki, S., Tagawa
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Journal Title
Appl. Phys. Lett 90, 023103
Pages: 1-3
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Growth of Suspended Single-Walled Carbon Nanotubes by Laser Irradiated Chemical Vapor Deposition2007
Author(s)
Y., Asai, Y., Fujiwara, Y., Ohno, K., Maehashi, K., Inoue K., Matsumoto
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Journal Title
J. Physics : Conf.Series 61
Pages: 46-50
Description
「研究成果報告書概要(欧文)」より
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