Functionalization of carbon nanotubes

Kuzmany, H.; Kukovecz, Ákos; Simón, F.; Holzweber, M.; Kramberger, Christian; Pichler, Thomas

doi:10.1016/j.synthmet.2003.08.018

Cited by 255 publications

(153 citation statements)

References 53 publications

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“…This effect was observed, e.g. upon nitric acid treatment, 15 given for this observation. In many cases, different sample morphologies were made responsible for the upshift of the RBM wavenumbers, either an increase in bundle size 15,127 or the opposite, a debundling of the SWCNTs.…”

Section: Shift Of Raman Modesmentioning

confidence: 56%

“…upon nitric acid treatment, 15 given for this observation. In many cases, different sample morphologies were made responsible for the upshift of the RBM wavenumbers, either an increase in bundle size 15,127 or the opposite, a debundling of the SWCNTs. 89,126,133 However, in many cases it cannot be decided whether the reported shift of the RBMs is a true shift of the individual modes.…”

Section: Shift Of Raman Modesmentioning

confidence: 93%

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Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Graupner

2007

J Raman Spectroscopy

304

229

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Raman spectroscopy is one of the most extensively employed methods for the characterization of carbon nanotubes. In this review article, an overview about Raman spectroscopy as a tool for the characterization of functionalized single-walled carbon nanotubes (SWCNTs) is given. First, the relevant Raman modes in SWCNTs are introduced. Then, in a phenomenological approach, the effects that are observed for the individual modes in the Raman spectra are compiled and discussed. It is shown that special care has to be taken in order to separate the effects of functionalization, which are specific to a subset of the SWCNTs (metallic/semiconducting or diameter dependent), from changes in sample morphology or doping effects.

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Section: Shift Of Raman Modesmentioning

confidence: 56%

Section: Shift Of Raman Modesmentioning

confidence: 93%

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Graupner

2007

J Raman Spectroscopy

304

229

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“…The optical properties of SWCNTs have been simulated in various studies. [6][7][8] Although several experimental [9][10][11][12][13][14][15][16][17][18][19][20][21] and theoretical studies [22][23][24][25][26] have considered (7, 7) the carbon nanotubes properties, the optical spectrum of CNTs (7,7) has not been probed yet.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of armchair (7, 7) single walled carbon nanotubes

Gharbavi

Badehian

2015

AIP Advances

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Full potential linearized augmented plane waves method with the generalized gradient approximation for the exchange-correlation potential was applied to calculate the optical properties of (7, 7) single walled carbon nanotubes. The both x and z directions of the incident photons were applied to estimate optical gaps, dielectric function, electron energy loss spectroscopies, optical conductivity, optical extinction, optical refractive index and optical absorption coefficient. The results predict that dielectric function, ε (ω), is anisotropic since it has higher peaks along z-direction than x-direction. The static optical refractive constant were calculated about 1.4 (z-direction) and 1.1 (x- direction). Moreover, the electron energy loss spectroscopy showed a sharp π electron plasmon peaks at about 6 eV and 5 eV for z and x-directions respectively. The calculated reflection spectra show that directions perpendicular to the tube axis have further optical reflection. Moreover, z-direction indicates higher peaks at absorption spectra in low range energies. Totally, increasing the diameter of armchair carbon nanotubes cause the optical band gap, static optical refractive constant and optical reflectivity to decrease. On the other hand, increasing the diameter cause the optical absorption and the optical conductivity to increase. Moreover, the sharp peaks being illustrated at optical spectrum are related to the 1D structure of CNTs which confirm the accuracy of the calculations.

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“…1,2 Functionalities influence the electronic properties of SWNTs by disrupting the graphitic-like sp 2 network of carbon in the SWNTs. This disruption produces local sp 3 defects which can introduce an impurity state near the Fermi level 3 and perturb the electronic spectra of these materials.…”

Section: Introductionmentioning

confidence: 99%

A Vibrational Spectroscopic Study of the Fate of Oxygen-Containing Functional Groups and Trapped CO₂ in Single-Walled Carbon Nanotubes During Thermal Treatment

et al. 2004

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The oxygen-containing functional groups, introduced by common purification procedures, on single-walled carbon nanotubes (SWNTs) made by both the HiPco and laser-ablation (Rice Tubes) techniques are studied by Fourier Transform Infrared (FTIR) spectroscopy from 90 to 1400 K under vacuum. The fate of the functional groups under heating and the physically trapped CO2 generated from the decomposition of these functional groups are investigated. Vacuum heating to ∼1300 K removes most of the oxygen-containing functionalities in the purified samples. The similarities in the infrared spectra of the Rice Tubes after a 1400 K treatment with spectra for the as-received and air/HCl treated HiPco nanotubes suggests the observation of intrinsic SWNT IR bands. Vacuum heating of nitric acid treated HiPco samples leads to the formation of a new feature, tentatively assigned to cyclic anhydride groups, in the 1850 cm-1 region. The cyclic anhydride groups decompose and ultimately disappear after thermal annealing to 600 K. Above 700 K, the quantity of CO2 trapped in HNO3 treated HiPco SWNTs decreases and trapped CO2 is completely released from the nanotubes after 1100 K even though oxygen-containing functionalities are still present on the sample. The Rice Tubes made by the laser ablation technique retain the physically trapped CO2 even after heating to 1400 K.

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Functionalization of carbon nanotubes

Cited by 255 publications

References 53 publications

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Optical properties of armchair (7, 7) single walled carbon nanotubes

A Vibrational Spectroscopic Study of the Fate of Oxygen-Containing Functional Groups and Trapped CO₂ in Single-Walled Carbon Nanotubes During Thermal Treatment

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Functionalization of carbon nanotubes

Cited by 255 publications

References 53 publications

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Optical properties of armchair (7, 7) single walled carbon nanotubes

A Vibrational Spectroscopic Study of the Fate of Oxygen-Containing Functional Groups and Trapped CO2 in Single-Walled Carbon Nanotubes During Thermal Treatment

Contact Info

Product

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About

A Vibrational Spectroscopic Study of the Fate of Oxygen-Containing Functional Groups and Trapped CO₂ in Single-Walled Carbon Nanotubes During Thermal Treatment