A detailed comparison of CVD grown and precursor based DWCNTs

Pfeiffer, R.; Peterlik, Herwig; Kuzmany, H.; Simón, F.; Pressl, K.-D.; Knöll, P.; Rümmeli, Mark H.; Shiozawa, Hidetsugu; Muramatsu, Hiroyuki; Kim, Yoong Ahm; Hayashi, T.; Endo, Morinobu

doi:10.1002/pssb.200879560

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…A good example is the (6,4)@(12,8) nanotube, where we predict a RBM frequency of 346.5 cm −1 as opposed to 339 cm −1 from previous works. 21,44 Further examples that we assigned differently are (6,4) @(11,10), (6,4)@(13,8), and (6,4)@(14,8). In the weakcoupling regime both models seem to deliver similar results; however, the underlying model of Pfeiffer et al 21,28 is not compatible with the optical energy shifts.…”

Section: ■ Resultsmentioning

confidence: 99%

Moiré-Induced Vibrational Coupling in Double-Walled Carbon Nanotubes

Gordeev

Waßerroth

et al. 2021

Nano Lett.

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Moiré patterns are additional, long-range periodicities in twisted crystalline bilayers. They are known to fundamentally change the electronic states of the layers, but similar effects on their mechanical and vibrational properties have not been discussed so far. Here we show that the Moiré potential shifts the radial breathing mode in double walled carbon nanotubes (DWCNTs). It is expected that the frequency change is proportional to the shift in optical transition energies, which are induced by the Moiré patterns. To verify our model we performed resonant Raman scattering on the purified and sorted semiconducting DWCNTs. We find that the radial breathing mode in the Raman spectra of DWCNTs is up to 14 cm -1 higher in energy and their optical transitions energies up to 200 meV lower in energy than in the corresponding single-walled tubes. The shift follows the expected linear correlation with a slope -88 eV/cm -1 . We show how to identify the strong coupling condition in DWCNTs from their phonon frequencies and construct a Kataura plot to aid their future experimental assignment.

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Section: ■ Resultsmentioning

confidence: 99%

Moiré-Induced Vibrational Coupling in Double-Walled Carbon Nanotubes

Gordeev

Waßerroth

et al. 2021

Nano Lett.

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“…4 According to Bandow et al, under prolonged heat treatment the initial diameters of the inner tubes can increase in order to adjust the wall-to-wall (WtW) distances and minimize the energy of the system. 4 Also, by using highresolution Raman spectroscopy, Pfeiffer et al [5][6][7][8] and Kuzmany et al, 9 observed that the inner tubes of C 60 -DWNTs can be contained inside outer tubes with different diameters where smaller WtW distances increase the inter-tube interaction and upshift the radial breathing mode (RBM) of the inner tubes. CVD-DWNTs and C 60 -DWNTs have been shown to have different optical properties that are believed to originate from differences in the WtW distances and the degree of crystallinity of the inner tubes.…”

Section: Introductionmentioning

confidence: 99%

Wall-to-wall stress induced in (6,5) semiconducting nanotubes by encapsulation in metallic outer tubes of different diameters: A resonance Raman study of individual C60-derived double-wall carbon nanotubes

et al. 2010

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We measure resonant Raman scattering from 11 individual C 60 -derived double wall carbon nanotubes with inner semiconducting (6,5) tubes and outer metallic tubes. The Raman spectra show the radial breathing mode (RBM) of the inner and the outer tubes simultaneously in resonance with the same laser energy. We observe that an increase in the RBM frequency of the inner tubes is related to an increase in the RBM frequency of the outer tubes. The Raman spectra also contain a sharp G − feature that increases in frequency as the nominal diameter of the outer metallic tubes decreases. Finally, the one phonon second-order D band mode shows a two way frequency splitting that decreases with decreasing nominal wall to wall distances. We suggest that the stress which increases with decreasing nominal WtW distances is responsible for the observed hardening of the frequencies of the RBM, D an G − modes of the inner (6,5) semiconducting tubes.

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“…2,3 The CVD-DWNTs and C 60 -DWNTs have been reported to have some differences in their electronic and optical properties due to differences in the crystallinity of the resulting inner tubes and in the characteristic distance between the inner and outer tubes. 4 For instance, C 60 -DWNTs have been observed to have smaller average wall to wall distances ͑defined as the distance between the inner and outer walls of the DWNT͒ than CVD-DWNTs for DWNTs with similar inner diameters. Also, the photoluminescence ͑PL͒ emission from the inner tubes of DWNTs appears to be highly dependent on sample fabrication and pu-rity because both high and low intensity PL signals from the inner tubes of DWNTs have been reported for CVD-DWNTs 5 and C 60 -DWNTs, 6 respectively.…”

Section: Introductionmentioning

confidence: 99%

Tunable Raman spectroscopy study of CVD and peapod-derived bundled and individual double-wall carbon nanotubes

et al. 2010

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We use 40 laser excitation energies to analyze the differences in the Raman spectra from chemical vapor deposition-derived double-wall carbon nanotube ͑CVD-DWNT͒ bundles, fullerene-derived DWNT bundles ͑C 60 -DWNTs͒, and individual fullerene-derived DWNTs with inner type-I and type-II semiconducting tubes paired with outer metallic tubes. For the radial breathing mode ͑RBM͒ of SWNTs, an experimental RBM vs d t relationship of the form RBM = A / d t + B is obtained for the inner tubes of DWNT bundles where the A and B constants are found to be close to those obtained by elasticity theory when modeling the elastic properties of graphite. A similar change in RBM is observed for an inner type-II semiconducting ͑6,5͒ tube and a type-I ͑9,1͒ tube when inside various metallic outer tubes. The G-band frequency is observed to upshift when switching the laser resonance from DWNTs with semiconducting inner tubes to DWNTs with metallic inner tubes. Finally, we measure the GЈ feature from C 60 -DWNTs and note a downshift in frequency with respect to that of CVD-DWNTs.

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A detailed comparison of CVD grown and precursor based DWCNTs

Cited by 11 publications

References 11 publications

Moiré-Induced Vibrational Coupling in Double-Walled Carbon Nanotubes

Moiré-Induced Vibrational Coupling in Double-Walled Carbon Nanotubes

Wall-to-wall stress induced in (6,5) semiconducting nanotubes by encapsulation in metallic outer tubes of different diameters: A resonance Raman study of individual C60-derived double-wall carbon nanotubes

Tunable Raman spectroscopy study of CVD and peapod-derived bundled and individual double-wall carbon nanotubes

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