Polarized Raman spectra of single-wall carbon nanotubes mono-dispersed in channels of AlPO 4 -5 single crystals

Sun, Handong; Tang, Zikang; Chen, J.; Li, G.

doi:10.1016/s0038-1098(98)00588-2

Cited by 77 publications

(54 citation statements)

References 12 publications

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“…The existence of 0.4 nm SWNTs has been confirmed by high-resolution transmission electron microscope ͑TEM͒ observation, 4,20,21 x-ray diffraction, 22 optical absorption spectra 7 as well as radialbreathing Raman modes ͑RBMs͒. 8,9 The zeolite framework can be removed by the following process: the AFI crystals containing SWNTs are ground into a fine powder in an amber mortar, then the powder is etched using hydrochloride acid ͑18%͒. There exist two layers in the solution, a black layer with SWNTs on the top and a transparent layer on the bottom.…”

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confidence: 83%

“…These nanotubes have been found either as the central shell of a multiwalled carbon nanotube, [1][2][3] or as the single-walled carbon nanotubes ͑SWNTs͒ present in the channels of a porous zeolite crystal, 4,5 or they branch perpendicularly anchored to the surface of larger nanotubes. 6 In particular, the aligned 0.4 nm SWNTs in the zeolite channels allow us to perform more controlled characterizations for the electronic system, such as the measurements of polarized absorption, 7 polarized Raman spectra, 8,9 and electric transport properties. 10,11 In comparison with large-sized nanotubes, the ultrasmall carbon nanotubes are especially interesting because of the strong curvature effect, which leads to a significant hybridization between the * and * orbitals.…”

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confidence: 99%

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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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confidence: 83%

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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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“…It should be noted that the 4 Å carbon nanotubes have been previously characterized by direct transmission electron microscope observation ͑after dissolving the AFI matrix͒, 9 polarized and resonant Raman scattering, 10,11 plus comparisons between first principle calculations and absorption spectra. 12,13 Figure 1 shows both a cartoon picture ͓Fig.…”

Section: Sample Preparation and Measurement Geometrymentioning

confidence: 99%

Superconducting resistive transition in coupled arrays of4Åcarbon nanotubes

et al. 2010

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We report superconducting resistive transition characteristics for array͑s͒ of coupled 4 Å single wall carbon nanotubes embedded in aluminophosphate-five zeolite. The transition was observed to initiate at 15 K with a slow resistance decrease switching to a sharp, order of magnitude drop at ϳ7.5 K. The latter exhibits anisotropic magnetic field dependence, and the differential resistance versus current ͑voltage͒ measurements show a rich variety of details that are consistent with the establishment of coherence, in stages, as the temperature is lowered below 15 K. In particular, the resistance drop that starts at 7.5 K exhibits attributes that are consistent with the manifestations of a Berezinskii-Kosterlitz-Thouless transition that establishes quasi-long-range order in the plane transverse to the c axis of the aligned nanotubes.

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“…The existence of the 0.4-nm nanotube has been confirmed by image of transmission electron microscopy, 12 x-ray diffraction, 14 optical absorption spectra, as well as radial breathing Raman modes. [15][16][17] There are three possible chiralities for the 0.4-nm SWNTs; they are the zigzag ͑5,0͒, the armchair ͑3,3͒, and the chiral ͑4,2͒ tubes.…”

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confidence: 99%

Raman spectra of lithium doped single-walled 0.4 nm carbon nanotubes

Tang

et al. 2003

Phys. Rev. B

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Using the vapor phase adsorption method, we show that it is possible to intercalate lithium atoms into 0.4-nm diameter single-walled carbon nanotubes. The charge-transfer behavior is studied by resonant Raman spectra. With increasing doping concentration, the radial breathing mode of these tubes shifts to higher frequency by about 18 cm Ϫ1 because the vibration perpendicular to the tube axis is depressed. The G band exhibits conventional softening and downshift behavior. By decomposing the G band by one Breit-WignerFano line shape and three Lorentzians, we found that the softening and downshift is due to the intensity competition between four components. The BWF component at 1558 cm Ϫ1 couples with the electronic continuum and survives until the saturated doping stage.

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Polarized Raman spectra of single-wall carbon nanotubes mono-dispersed in channels of AlPO 4 -5 single crystals

Cited by 77 publications

References 12 publications

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

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

Superconducting resistive transition in coupled arrays of4Åcarbon nanotubes

Raman spectra of lithium doped single-walled 0.4 nm carbon nanotubes

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