Vibrational Signatures in the Infrared Spectra of Single- and Double-Walled Carbon Nanotubes and Their Diameter Dependence

Pekker, Áron; Botos, Ákos; Rusznyák, Á.; Koltai, János; Kürti, J.

doi:10.1021/jz200899d

Cited by 16 publications

(13 citation statements)

References 22 publications

(37 reference statements)

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“…We hope that these results will stimulate further research into vibrational measurements via inelastic electron tunneling spectroscopy and neutron scattering spectroscopy on carbon nanotubes, or the vibrational properties of multi-walled carbon nanotubes 66,67 and other carbon nanostructures. [68][69][70]…”

Section: Resultsmentioning

confidence: 93%

Structural characterization of carbon nanotubes via the vibrational density of states

Pool

Jain

Barkema

2017

Carbon

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The electrical and chemical properties of carbon nanotubes vary significantly with different chirality and diameter, making the experimental determination of these structural properties important. Here, we show that the vibrational density of states (VDOS) contains information on the structure of carbon nanotubes, particularly at low frequencies. We show that the diameter and chirality of the nanotubes can be determined from the characteristic low frequency L and L modes in the VDOS. For zigzag nanotubes, the L peak splits into two peaks giving rise to another low energy L peak. The significant changes in the frequencies and relative intensities of these peaks open up a route to distinguish among structurally different nanotubes. A close study of different orientations of Stone-Wales defects with varying defect density reveals that different structural defects also leave distinct fingerprints in the VDOS, particularly in the L and L modes. With our results, more structural information can be obtained from experiments which can directly measure the VDOS, such as inelastic electron and inelastic neutron spectroscopy.

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Section: Resultsmentioning

confidence: 93%

Structural characterization of carbon nanotubes via the vibrational density of states

Pool

Jain

Barkema

2017

Carbon

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“…1), such as nanoporous carbon. 44,45 We hope that these results will stimulate further studies of vibrational properties of other carbon-based nanomaterials such as carbon-nanotubes, 46,47 graphene nano-ribbons, 48 and functionalized graphene. 49…”

Section: Figs 2(d) and 3(e)mentioning

confidence: 89%

Probing Crystallinity of Graphene Samples via the Vibrational Density of States

Jain

Juričić

Barkema

2015

J. Phys. Chem. Lett.

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The purity of graphene samples is of crucial importance for their experimental and practical use. In this regard, the detection of the defects is of direct relevance. Here, we show that structural defects in graphene samples give rise to clear signals in the vibrational density of states (VDOS) at specific peaks at high and low frequencies. These can be used as an independent probe of the defect density. In particular, we consider grain boundaries made of pentagon-heptagon pairs, and show that they lead to a shift of the characteristic vibrational D mode toward higher frequency; this distinguishes these line defects from Stone-Wales point defects, which do not lead to such a shift. Our findings may be instrumental for the detection of structural lattice defects using experimental techniques that can directly measure VDOS, such as inelastic electron tunneling and inelastic neutron spectroscopy.

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“…The phenomenon may prove useful in quantifying disorder in graphene, and it will allow the modulation of the optical conductivity in a narrow terahertz band, hence providing extended tools for telecommunications, medical and security imaging, and novel analytic and sensing capabilities. Our model for single-layer graphene is also expected to be universal, and to hold for a broad variety of systems: in particular, the infrared spectroscopy of bilayer , and few-layer graphene, as well as carbon nanotubes, ,, should be revisited, as there too shall disorder enable phonon-mediated intra- and intervalley scattering.…”

Section: Discussionmentioning

confidence: 99%

Antiresonances in the Mid-Infrared Vibrational Spectrum of Functionalized Graphene

et al. 2017

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We report anomalous antiresonances in the infrared spectra of doped and disordered single layer graphene. Measurements in both reflection microscopy and transmission configurations of samples grafted with halogenophenyl moieties are presented. Asymmetric transparency windows at energies corresponding to phonon modes near the Γ and K points are observed, in contrast to the featureless spectrum of pristine graphene. These asymmetric antiresonances are demonstrated to vary as a function of the chemical potential and defect density. We propose a model that involves coherent intraband scattering with defects and phonons, thus relaxing the optical selection rule forbidding access to q ≠ Γ phonons. This interpretation of the new phenomenon is supported by our numerical simulations that reproduce the experimental features.

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Vibrational Signatures in the Infrared Spectra of Single- and Double-Walled Carbon Nanotubes and Their Diameter Dependence

Cited by 16 publications

References 22 publications

Structural characterization of carbon nanotubes via the vibrational density of states

Structural characterization of carbon nanotubes via the vibrational density of states

Probing Crystallinity of Graphene Samples via the Vibrational Density of States

Antiresonances in the Mid-Infrared Vibrational Spectrum of Functionalized Graphene

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