Raman Spectroscopy on Individual Identified Carbon Nanotubes

2012 ◽  
Vol 1407 ◽  
Author(s):  
R. Parret ◽  
D. Levshov ◽  
T. X. Than ◽  
D. Nakabayashi ◽  
T. Michel ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Energy ◽  
Low Frequency ◽  
Radial Breathing Mode ◽  
Incident Laser ◽  
Mechanical Coupling ◽  
Incident Laser Energy ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

ABSTRACTIn this paper, we discuss the low-frequency range of the Raman spectrum of individual suspended index-identified single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs). In SWCNTs, the role of environment on the radial breathing mode (RBM) frequency is discussed. We show that the interaction between the surrounding air and the nanotube does not induce a RBM upshift. In several DWCNTs, we evidence that the low-frequency modes cannot be connected to the RBM of each related layer. We discuss this result in terms of mechanical coupling between the layers which results in collective radial breathing-like modes. The mechanical coupling qualitatively explains the observation of Raman lines of radial breathing-like modes, whenever only one of the layers is in resonance with the incident laser energy.

Terahertz Time Domain Spectroscopy to Detect Low-Frequency Vibrations of Double-Walled Carbon Nanotubes

2010 ◽  
Vol 2010 (27) ◽  
pp. 4363-4366 ◽  
Author(s):  
Sunil Kumar ◽  
Natrajan Kamaraju ◽  
Alexander Moravsky ◽  
R. O. Loutfy ◽  
Marc Tondusson ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Time Domain ◽  
Low Frequency ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

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 DC and radio-frequency transmission characteristics of double-walled carbon nanotubes-based ink

2010 ◽  
Vol 2 (5) ◽  
pp. 471-477 ◽  
Author(s):  
Sébastien Pacchini ◽  
Emmanuel Flahaut ◽  
Norbert Fabre ◽  
Véronique Conédéra ◽  
Fabien Mesnilgrente ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Propagation Constant ◽  
Low Frequency ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Network Layers ◽  
Transmission Parameters ◽  
Glycol Solution ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this paper, double-walled carbon nanotubes (DWNTs) network layers were patterned using inkjet transfer printing. The remarkable conductive characteristics of carbon nanotubes (CNTs) are considered as promising candidates for transmission line as well as microelectronic interconnects of an arbitrary pattern. In this work, the DWNTs were prepared by the catalytic chemical vapor deposition process, oxidized and dispersed in ethylene-glycol solution. The DWNTs networks were deposited between electrodes contact and then characterized at DC through current–voltage measurements, low frequency, and high frequency by scattering parameters measurements from 40 MHz up to 40 GHz through a vector network analyzer. By varying the number of inkjet overwrites, the results confirm that the DC resistance of DWNTs networks can be varied according to their number and that furthermore the networks preserve ohmic characteristics up to 100 MHz. The microwave transmission parameters were obtained from the measured S-parameter data. An algorithm is developed to calculate the propagation constant “γ”, attenuation constant “α” in order to show the frequency dependence of the equivalent resistance of DWNTs networks, which decreases with increasing frequency.

Far Infrared Characterization of Single and Double Walled Carbon Nanotubes

2011 ◽  
Vol 1284 ◽  
Author(s):  
S. G. Chou ◽  
Z. Ahmed ◽  
G.G. Samsonidze ◽  
J. Kong ◽  
M. S. Dresselhaus ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Low Frequency ◽  
Far Infrared ◽  
Diameter Distribution ◽  
Thermal Excitation ◽  
Polyethylene Matrix ◽  
Swcnt Sample ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

ABSTRACTHigh resolution far infrared absorption measurements were carried out for single walled and double walled carbon nanotubes samples (SWCNT and DWCNT) encased in a polyethylene matrix to investigate the temperature and bundling effects on the low frequency phonons associated with the low frequency circumferential vibrations. At a temperature where kBT is significantly lower than the phonon energy, the broad absorption features as observed at room temperature become well resolved phonon transitions. For a DWCNT sample whose inner tubes have a similar diameter distribution as the SWCNT sample studied, a series of sharp features were observed at room temperature at similar positions as for the SWCNT samples studied. The narrow linewidth is attributed to the fact that the inner tubes are isolated from the polyethylene matrix and the weak inter-tubule interactions. More systematic studies will be required to better understand the effects of inhomogeneous broadening and thermal-excitation on the detailed position and lineshape of the low frequency phonon features in carbon nanotubes.

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