Effects of Chirality and Defect Density on the Intermediate Frequency Raman Modes of Individually Suspended Single-Walled Carbon Nanotubes

2018 ◽  
Vol 122 (16) ◽  
pp. 9184-9190 ◽  
Author(s):  
Takumi Inaba ◽  
Yuichirou Tanaka ◽  
Satoru Konabe ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Defect Density ◽  
Single Walled Carbon Nanotubes ◽  
Intermediate Frequency ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Walled Carbon Nanotubes

scholarly journals Raman Modes of Index-Identified Freestanding Single-Walled Carbon Nanotubes

2005 ◽  
Vol 95 (21) ◽  
Author(s):  
Jannik C. Meyer ◽  
Matthieu Paillet ◽  
Thierry Michel ◽  
Alain Moréac ◽  
Anita Neumann ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Walled Carbon Nanotubes

Probing factors affecting the Raman modes and structural collapse of single-walled carbon nanotubes under pressure

2013 ◽  
Vol 250 (7) ◽  
pp. 1370-1375 ◽  
Author(s):  
Mingguang Yao ◽  
Shuangchen Lu ◽  
Junping Xiao ◽  
Zhen Yao ◽  
Linhai Jiang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Structural Collapse ◽  
Factors Affecting ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Walled Carbon Nanotubes

Structural Analysis of Encapsulated Single-Walled Carbon Nanotubes

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
D. B. Singh ◽  
V. N. Shukla ◽  
Vikas Kumar ◽  
Pragya Gupta ◽  
L. Ramma
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Properties ◽  
Single Walled Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Peak Position ◽  
Light Illumination ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Tip Enhanced Raman Spectroscopy ◽  
Walled Carbon Nanotubes

Tip-enhanced Raman spectroscopy revealed the nanoscale chemical properties of organic molecules encapsulated in single walled carbon nanotubes (SWNTs). Our approach is based on an enhanced electric field near a laser-irradiated metal tip functioning as a Raman excitation source. The enhanced field can successfully act on encapsulated molecules through the walls of the SWNTs to extract molecular vibrational information -carotene, which exhibits several active Raman modes under visible light illumination, was used as the encapsulated molecule. Tip-enhanced Raman spectra measured at seven different positions on SWNT bundles showed that carotene molecules inside the tubes were not uniformly distributed. It is also found that the filling rate and peak position of the radial breathing mode of the SWNTs are linearly correlated.

scholarly journals Raman Spectroscopy Study of the Doping Effect of the Encapsulated Iron, Cobalt, and Nickel Bromides on Single-Walled Carbon Nanotubes

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Marianna V. Kharlamova
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Single Walled Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Doping Effect ◽  
Single Walled Carbon ◽  
Iron Bromide ◽  
Raman Modes ◽  
Walled Carbon Nanotubes ◽  
Cobalt And Nickel

In this contribution the modification of the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with nickel bromide, cobalt bromide, and iron bromide was studied by Raman spectroscopy. The doping-induced alterations of the radial breathing mode (RBM) and G-mode in the Raman spectra of the filled SWCNTs were analyzed in detail. The observed shifts of the components of the Raman modes and changes of their profiles allowed concluding that the embedded compounds have an acceptor doping effect on the SWCNTs, and the doping level increases in the line with nickel bromide-cobalt bromide-iron bromide.

Effect of van der Waals Interactions on the Raman Modes in Single Walled Carbon Nanotubes

2001 ◽  
Vol 86 (17) ◽  
pp. 3895-3898 ◽  
Author(s):  
A. M. Rao ◽  
J. Chen ◽  
E. Richter ◽  
U. Schlecht ◽  
P. C. Eklund ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Van Der Waals ◽  
Single Walled Carbon Nanotubes ◽  
Van Der Waals Interactions ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Walled Carbon Nanotubes

scholarly journals Controlling the Crystalline Quality and the Purity of Single-walled Carbon Nanotubes Grown by Catalytic Chemical Vapor Deposition

2013 ◽  
Vol 1515 ◽  
Author(s):  
Hugo Navas ◽  
Matthieu Picher ◽  
Raul Arenal ◽  
Etienne Quesnel ◽  
Eric Anglaret ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Defect Density ◽  
Low Frequency ◽  
Chemical Vapor ◽  
Single Walled Carbon Nanotubes ◽  
Growth Conditions ◽  
Single Walled Carbon ◽  
Frequency Components ◽  
Walled Carbon Nanotubes ◽  
By Products

ABSTRACTIt is frequently observed that as-grown single-walled carbon nanotubes (SWCNTs) contain defects. Controlling the defect density is a key issue for the control of nanotube properties. However, little is known about the influence of the growth conditions on the formation of nanotube defects. In addition, SWCNT samples frequently contain carbonaceous by-products which affect their ensemble properties. Raman spectroscopy is commonly used to characterize both features from the measurement of the defect-induced D band. However, the contribution of each carbonaceous species to the D band is usually not known making it difficult to separately extract the defect density and relative abundance of each. Here, we report on the correlated evolution of the D and G’ bands of SWCNT samples with increasing growth temperature. In the general case, three to four Lorentzian components are required to fit them. Coupled with HRTEM characterization, the low frequency components of the D and G’ can be attributed to the contribution of SWCNTs while high frequency components are associated with defective carbonaceous by-products. The nature of these defective by-products varies with the type of catalysts and with the growth conditions.

NEAR-FIELD RAMAN SPECTROSCOPY OF INDIVIDUAL SINGLE-WALLED CARBON NANOTUBES

2004 ◽  
Vol 03 (03) ◽  
pp. 371-379 ◽  
Author(s):  
ACHIM HARTSCHUH ◽  
NEIL ANDERSON ◽  
LUKAS NOVOTNY
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Spatial Resolution ◽  
Near Field ◽  
Single Walled Carbon Nanotubes ◽  
Raman Signal ◽  
Single Walled Carbon ◽  
Raman Modes ◽  
Metal Tip ◽  
Walled Carbon Nanotubes

Near-field Raman spectroscopy with high spatial resolution is used to study single-walled carbon nanotubes (SWNTs) within dense samples. A sharp, laser-irradiated metal tip acts as a near-field excitation source causing an enhanced Raman signal within close proximity of the tip. We present optical images of different Raman modes with a spatial resolution better than 15 nm. Local spectroscopy allows us to identify and distinguish tubes with different structures on the nanometer-scale and to observe variations within the spectrum of individual tubes.

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