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.

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 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.

scholarly journals Unusual transport characteristics of nitrogen-doped single-walled carbon nanotubes

2008 ◽  
Vol 93 (4) ◽  
pp. 043113 ◽  
Author(s):  
Yo-Sep Min ◽  
Eun Ju Bae ◽  
Un Jeong Kim ◽  
Eun Hong Lee ◽  
Noejung Park ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Nitrogen Doped ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Dissociative adsorption of O2 on negatively charged nitrogen-doped single-walled carbon nanotubes: first-principles calculations

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84155-84163 ◽  
Author(s):  
Divya Srivastava ◽  
Kari Laasonen
Keyword(s):  
Carbon Nanotubes ◽  
Dft Calculations ◽  
First Principles ◽  
Single Walled Carbon Nanotubes ◽  
Dissociative Adsorption ◽  
First Principles Calculations ◽  
Nitrogen Doped ◽  
Single Walled Carbon ◽  
Additional Charges ◽  
Walled Carbon Nanotubes

Spin unrestricted DFT calculations have been used to study the molecular and dissociative adsorption of O2 on achiral substitutional nitrogen-doped single-walled carbon nanotubes with and without additional charges.

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