scholarly journals Temperature Dependence of G− Mode in Raman Spectra of Metallic Single-Walled Carbon Nanotubes

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Qianru Wu ◽  
Zhijie Wen ◽  
Xiuyun Zhang ◽  
Lei Tian ◽  
Maoshuai He
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Laser Energy ◽  
Resonance Condition ◽  
Intensity Variation ◽  
Single Walled Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Single Walled Carbon ◽  
Electron Phonon Coupling ◽  
Walled Carbon Nanotubes

The temperature evolution of G mode in the Raman spectra of surface grown single-walled carbon nanotubes (SWNTs) is investigated. It is revealed that the intensity of G− mode in Raman spectra varies with the measurement temperature. The intensity variation of the G− mode is synchronized to that of the radial breathing mode, which is sensitive to the resonance condition (∣EL−Eii∣). Such an intensity evolution is associated with the temperature-induced change of Eii. That is, the intensity of G−, an indication of electron-phonon coupling in metallic SWNTs, can be greatly enhanced only when the laser energy well matches the transition energy of nanotubes (Eii). In other words, the window for observing asymmetric and broad G− mode is very narrow. This work further confirms that the G− mode in the Raman spectrum mainly arises from metallic SWNTs, and caution should be paid when using the intensity ratio of G−/G+ to estimate the percentage of metallic SWNTs in products.

Quantitative evaluation of bundling effect on single walled carbon nanotubes by resonance Raman spectra

2004 ◽  
Vol 858 ◽  
Author(s):  
Zhengtang Luo ◽  
Rongfu Li ◽  
Sang Nyon Kim ◽  
Fotios Papadimitrakopoulos
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Single Walled Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Peak Position ◽  
Single Walled Carbon ◽  
Physicochemical Changes ◽  
Resonance Raman Spectra ◽  
Walled Carbon Nanotubes

ABSTRACTThe radial breathing mode (RBM) region of the resonance Raman spectra of HiPco single walled carbon nanotubes (SWNTs) was investigated as a function of aggregation. This was modeled using an energetic deviation term (ΔE), imparted to the optical transitions (Eii(n, m)) by bundling effect. Eii(n, m) values obtained from photoluminescence (PL) measurements were used to reconstruct these RBM profiles. The simulation revealed that the PL-determined Eii(n, m) set provided a good fit in terms of peak position. Providing an accurate set of Eii(n, m) values becomes available, the RBM profile reconstruction methodology discussed herein could greatly enhance our ability to model a range of physicochemical changes to the immediate environment of SWNTs.

scholarly journals Nonresonant Polarized Raman Spectra Calculations of Nitrogen-Doped Single-Walled Carbon Nanotubes: Diameter, Chirality, and Doping Concentration Effects

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
F. Allali ◽  
H. Chadli ◽  
M. Bentaleb ◽  
P. Hermet ◽  
A. Rahmani
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Doping Concentration ◽  
Single Walled Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Concentration Effects ◽  
Nitrogen Doped ◽  
Single Walled Carbon ◽  
Polarized Raman ◽  
Walled Carbon Nanotubes

Raman spectra of nitrogen-doped single-walled carbon nanotubes are calculated using the spectral moment’s method combined with the bond polarizability model. The influence of the nanotube diameter and chirality is investigated. We also address the important question of the effect of the N-doping concentration, and we propose an equation to estimate the doping concentration from the knowledge of the tube diameter and the frequency of the radial breathing mode.

On the Electron−Phonon Coupling of Individual Single-Walled Carbon Nanotubes

Nano Letters ◽  
2005 ◽  
Vol 5 (9) ◽  
pp. 1761-1767 ◽  
Author(s):  
Matti Oron-Carl ◽  
Frank Hennrich ◽  
Manfred M. Kappes ◽  
Hilbert v. Löhneysen ◽  
Ralph Krupke
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Phonon Coupling ◽  
Single Walled Carbon ◽  
Electron Phonon Coupling ◽  
Walled Carbon Nanotubes

scholarly journals C60 Filling Rate in Carbon Peapods: A Nonresonant Raman Spectra Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Fatima Fergani ◽  
Sidi Abdelmajid Ait Abdelkader ◽  
Hassane Chadli ◽  
Brahim Fakrach ◽  
Abdelhai Rahmani ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Experimental Method ◽  
Raman Spectra ◽  
Double Helix ◽  
Single Walled Carbon Nanotubes ◽  
Filling Rate ◽  
Spectra Analysis ◽  
Single Walled Carbon ◽  
Bond Polarizability ◽  
Walled Carbon Nanotubes

We calculated the nonresonant Raman spectra of C60 peapods to determine the concentration of C60 fullerenes inside single-walled carbon nanotubes. We focus on peapods with large diameters for which C60 molecules can adopt a double helix configuration or a two-molecule layer configuration. Our calculations are performed within the framework of the bond-polarizability model combined with the spectral moment’s method. The changes in the Raman spectra as a function of C60 filling rate and the configuration of C60 molecules inside the nanotubes are identified and discussed. Our calculations support the experimental method proposed by Kuzmany to evaluate the concentration of C60 molecules inside nanotubes.

Sign in / Sign up

Export Citation Format

Share Document