Optical absorption and resonance Raman scattering of carbon nanotubes

Kataura, Hiromichi; Kumazawa, Y.; Kojima, N.; Maniwa, Yutaka; Umezu, Ikurou; Masubuchi, S.; Kazama, S.; Zhao, Xiang-Fu; Ando, Yoshinori; Ohtsuka, Y.; Suzuki, Sayaka; Achiba, Yohji

doi:10.1063/1.59804

Cited by 13 publications

(18 citation statements)

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“…The optical transition energy, E ii , as a function of the tube diameter that is obtained by the Raman excitation profile for each (n,m) SWNT, is called the Kataura plot (41,42), and an example of such a plot is shown in Figure 8. The Kataura plot is frequently used for assigning (n,m) values from resonance Raman spectra (13) and photoluminescence spectra (43).…”

Section: The Rbm Measurement and The Experimental Kataura Plotmentioning

confidence: 99%

Characterizing Graphene, Graphite, and Carbon Nanotubes by Raman Spectroscopy

Dresselhaus

Jório

Saito

2010

Annu. Rev. Condens. Matter Phys.

569

360

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Recent advances in Raman spectroscopy for characterizing graphene, graphite, and carbon nanotubes are reviewed comparatively. We first discuss the first-order and the double-resonance (DR) second-order Raman scattering mechanisms in graphene, which give rise to the most prominent Raman features. Then, we review phonon-softening phenomena in Raman spectra as a function of gate voltage, which is known as the Kohn anomaly. Finally, we review exciton-specific phenomena in the resonance Raman spectra of single-wall carbon nanotubes (SWNTs). Raman spectroscopy of SWNTs has been especially useful for understanding many fundamental properties of all sp 2 carbons, given SWNTs can be either semiconducting or metallic depending on their geometric structure, which is denoted by two integers (n,m).

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Section: The Rbm Measurement and The Experimental Kataura Plotmentioning

confidence: 99%

Characterizing Graphene, Graphite, and Carbon Nanotubes by Raman Spectroscopy

Dresselhaus

Jório

Saito

2010

Annu. Rev. Condens. Matter Phys.

569

360

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“…5,6 In particular, the radial breathing mode ͑RBM, i.e., Raman shift between 100 and 380 cm −1 ͒ region is strongly dependent on nanotube ͑n , m͒ structure, and also serves well as a sensitive probe of the physicochemical environment and aggregation state of SWNTs. [7][8][9][10][11][12] Aggregation state has a profound impact on SWNT electronic behavior and observed optical properties. Theoretical descriptions of bundling interactions 13 and resonance Raman measurements 8,12 demonstrate significant redshifting and broadening of electronic transitions resulting from intertube interactions.…”

Section: Introductionmentioning

confidence: 99%

Bundling effects on the intensities of second-order Raman modes in semiconducting single-walled carbon nanotubes

2008

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The second-order Raman modes in the range of 380-650 cm −1 were investigated for individually dispersed and aggregated HiPco single-walled carbon nanotubes ͑SWNTs͒ using a 700-985 nm tunable laser source. For individually dispersed SWNTs, this Raman region displays relatively weak response from both intermediate frequency modes ͑IFMs͒ and the overtones of the radial breathing mode ͑RBM͒, with the latter dominating. In contrast, for aggregated SWNTs, the IFMs dominate and gain significant intensity relative to the RBM fundamental. Utilizing the correlation between RBM overtone and RBM fundamental intensity ratio as a function of laser energy, we derived Huang-Rhys factors for several ͑n , m͒ nanotube species in both individually dispersed and aggregated states. These values were further used to obtain the corresponding absolute values of the exciton-phonon interaction matrix element for these nanotube species. It is demonstrated that the chiral-angle dependence of exciton-phonon coupling parameters is similar for dispersed and bundled samples. However, we find that bundling results in a decrease in the exciton-phonon coupling for the RBM, while the IFMs display the opposite behavior. These findings are particularly relevant for further clarifying the factors that govern Raman intensities and provide a tool for the selective characterization of various mod͑n − m ,3͒ =2 ͑n , m͒-SWNTs as a function of their aggregation state.

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“…The RBM shows upshift with respect to that of an individual tube which is similar to the confinement effect of AFI zeolite. 25 ͑2͒ The relative intensity of the disorder-induced D band is significantly increased in the spectrum of freestanding SWNTs. The D band phonon modes are not Raman active until the defect on the graphitic sheet breaks the translational symmetry of SWNTs.…”

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confidence: 99%

Raman spectra and thermal stability analysis of0.4nmfreestanding single-walled carbon nanotubes

Tang

2005

Phys. Rev. B

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The thermal stability of ultrasmall 0.4 nm single-walled carbon nanotubes ͑SWNTs͒ are studied by means of Raman-scattering measurements under a vacuum. The 0.4 nm SWNTs are very stable when they are confined inside the channels of the AlPO 4 -5 zeolite crystal. When these SWNTs are extracted from the channels into free space, however, they become thermally unstable because of the strong curvature effect. The in situ Raman-scattering measurement under 1 ϫ 10 −5 mbar shows all three structures of the 0.4-nm-sized SWNTs are destroyed between 730 to 790 K, a temperature range much lower than that of large-sized SWNTs. The ͑5,0͒ tube is only destroyed after the temperature reaches 790 K and seems slightly more stable than the other two structures: the ͑3,3͒ and ͑4,2͒ tubes. A reference measurement under UHV conditions confirms that the 0.4 nm SWNTs are destroyed after the same thermal treatment indicating that the structural degradation is determined by the curvature effect other than oxidation.

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Optical absorption and resonance Raman scattering of carbon nanotubes

Cited by 13 publications

References 1 publication

Characterizing Graphene, Graphite, and Carbon Nanotubes by Raman Spectroscopy

Characterizing Graphene, Graphite, and Carbon Nanotubes by Raman Spectroscopy

Bundling effects on the intensities of second-order Raman modes in semiconducting single-walled carbon nanotubes

Raman spectra and thermal stability analysis of0.4nmfreestanding single-walled carbon nanotubes

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