Diameter selective reaction processes of single-wall carbon nanotubes

Simón, F.; Kukovecz, Ákos; Kramberger, Christian; Pfeiffer, R.; Hasi, F.; Kuzmany, H.; Kataura, Hiromichi

doi:10.1103/physrevb.71.165439

Cited by 46 publications

(49 citation statements)

References 24 publications

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“…Abe et al [24] reported X-ray measurements that suggest a more likely diameter difference of 0.72 nm. Even though a recent Raman analysis supports this value [25], we think that our main results are not affected by this difference. For larger equilibrium diameters the interaction will be weaker in general and therefore more likely reduce the calculated splitting.…”

Section: Discussionmentioning

confidence: 45%

Interaction between concentric tubes in DWCNTs

et al. 2004

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Abstract. A detailed investigation of the Raman response of the inner tube radial breathing modes (RBMs) in double-wall carbon nanotubes is reported. It revealed that the number of observed RBMs is two to three times larger than the number of possible tubes in the studied frequency range. This unexpected increase in Raman lines is attributed to a splitting of the inner tube response. It is shown to originate from the possibility that one type of inner tube may form in different types of outer tubes and the fact that the inner tube RBM frequency depends on the diameter of the enclosing tube. Finally, a comparison of the inner tube RBMs and the RBMs of tubes in bundles gave clear evidence that the interaction in a bundle is stronger than the interaction between inner and outer tubes.

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Section: Discussionmentioning

confidence: 45%

Interaction between concentric tubes in DWCNTs

et al. 2004

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“…Using the method detailed above, we have calculated the inhomogeneous broadening of the RBM frequency of the (10,0), (7,4), and (5,5) SWCNTs.…”

Section: Resultsmentioning

confidence: 99%

“…Long range force constants were taken into account to ensure high accuracy of the frequencies: the length of the supercells used to calculate the Hessian matrices were 12.7 Å, 13.6 Å, and 14.7 Å for (10,0), (7,4), and (5,5), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…We used the VASP density functional theory code [8] at the LDA level and PAW method to calculate the inhomogeneous broadening of the RBM mode for three experimentally relevant SWCNTs: (10,0), (7,4), and (5,5) (the inner tube diameter range is centered around 7 Å). Long range force constants were taken into account to ensure high accuracy of the frequencies: the length of the supercells used to calculate the Hessian matrices were 12.7 Å, 13.6 Å, and 14.7 Å for (10,0), (7,4), and (5,5), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Two mechanisms have been suggested for inner tube growth: (i) from di-or polymerized encapsulated fullerenes [3][4][5] through Stone-Wales transformations [6], (ii) from completely disintegrated fullerenes [7].…”

Section: Introductionmentioning

confidence: 99%

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The effects of inhomogeneous isotope distribution on the vibrational properties of isotope enriched double walled carbon nanotubes

Zólyomi

Simón

Rusznyák

et al. 2007

Physica Status Solidi (b)

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The radial breathing mode in the Raman spectrum of 13 C isotope enriched single walled carbon nanotubes is inhomogeneously broadened due to the random distribution of isotopes. We study this effect theoretically using density functional theory within the local density approximation and compare the result with experiments on isotope engineered double walled carbon nanotubes in which the inner tubes were grown from a mixture of 13 C enriched fullerenes and natural fullerenes. As explained by the calculations, this synthesis procedure leads to an increased inhomogeneity compared to a case when only enriched fullerenes are used. The good agreement between the measurements and calculations shows the absence of carbon diffusion along the tube axis during inner tube growth, and presents a strong support of the theory that inner tube growth is governed by Stone -Wales transformations following the interconnection of fullerenes.

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Spectroelectrochemistry of Carbon Nanostructures

2007

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This review is focused on charge-transfer reactions at carbon nanotubes and fullerenes. The spectroelectrochemistry of fullerenes deals with the spin states of fullerenes, the role of mono-anions and the reactivity of higher charged states in C60. The optical (Vis-NIR) spectroelectrochemistry of single-walled carbon nanotubes (SWNTs) follows changes in the allowed optical transitions among the Van Hove singularities. The Raman spectroelectrochemistry of SWNT benefits from strong resonance enhancement of the Raman scattering. Here, both semiconducting and metallic SWNTs are analyzed using the radial breathing mode (RBM) and G-modes as well as the second order (D, G') and intermediate frequency modes. Raman spectroelectrochemistry of SWNT allows the addressing of index-identified tubes and even single isolated nanotubes. Optical and Raman spectroelectrochemistry of fullerene peapods, C60@SWNT and C70@SWNT indicates effective shielding of the intratubular fullerene (peas). The most striking effect in the spectroelectrochemistry of peapods is the so-called "anodic Raman enhancement" of intratubular C60. Double-walled carbon nanotubes (DWNTs) give a specific spectroscopic response in Vis-NIR spectroelectrochemistry for the inner and the outer tube. They are better distinguishable by Raman spectroelectrochemistry which allows a precise tracing of the specific doping response of outer/inner tubes.

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Diameter selective reaction processes of single-wall carbon nanotubes

Cited by 46 publications

References 24 publications

Interaction between concentric tubes in DWCNTs

Interaction between concentric tubes in DWCNTs

The effects of inhomogeneous isotope distribution on the vibrational properties of isotope enriched double walled carbon nanotubes

Spectroelectrochemistry of Carbon Nanostructures

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