Electron Spin Resonance and Raman Scattering Spectroscopy of Multi-Walled Carbon Nanotubes: A Function of Acid Treatment

2006 ◽  
Vol 6 (1) ◽  
pp. 135-140 ◽  
Author(s):  
T. Pietraß ◽  
J. L. Dewald ◽  
C. F. M. Clewett ◽  
D. Tierney ◽  
A. V. Ellis ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Spin Resonance ◽  
Fermi Level ◽  
Electron Spin ◽  
Acid Treatment ◽  
Transport Mechanism ◽  
Raman Scattering Spectroscopy ◽  
Spin Resonance ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

We compare the fundamental transport mechanism in multi-walled carbon nanotubes (MWNTs) by means of electron spin resonance (ESR) and Raman spectroscopy as a function of acid treatment. The ESR and Raman results show that the acid treatment reduces the density of states at the Fermi level. Defects introduced through the acid treatment move the Fermi level closer to the K points in the valence band, and consequently conduction is reduced. These defects are identified as Stone-Wales type from the Raman results.

Electron spin resonance of single-walled carbon nanotubes and related structures

2006 ◽  
Vol 243 (13) ◽  
pp. 3106-3110 ◽  
Author(s):  
B. Náfrádi ◽  
N. M. Nemes ◽  
T. Fehér ◽  
L. Forró ◽  
Y. Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Spin Resonance ◽  
Walled Carbon Nanotubes

Electron spin resonance study of single-walled carbon nanotubes

2011 ◽  
Vol 248 (11) ◽  
pp. 2564-2567 ◽  
Author(s):  
Aida Abiad Monge ◽  
Núria Ferrer-Anglada ◽  
Vega Lloveras ◽  
José Vidal-Gancedo ◽  
Siegmar Roth
Keyword(s):  
Carbon Nanotubes ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Single Walled Carbon Nanotubes ◽  
Electron Spin Resonance Study ◽  
Single Walled Carbon ◽  
Spin Resonance ◽  
Walled Carbon Nanotubes ◽  
Spin Resonance Study

scholarly journals Enhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removal

ACS Nano ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 2165-2173 ◽  
Author(s):  
William D. Rice ◽  
Ralph T. Weber ◽  
Ashley D. Leonard ◽  
James M. Tour ◽  
Pavel Nikolaev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Single Walled Carbon Nanotubes ◽  
Oxygen Removal ◽  
Single Walled Carbon ◽  
Spin Resonance ◽  
Walled Carbon Nanotubes

Defect-induced vibrational response of multi-walled carbon nanotubes using resonance Raman spectroscopy

2005 ◽  
Vol 20 (12) ◽  
pp. 3368-3373 ◽  
Author(s):  
S.A. Curran ◽  
J.A. Talla ◽  
D. Zhang ◽  
D.L. Carroll
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Acid Treatment ◽  
Defect Formation ◽  
Double Resonance ◽  
Resonance Raman ◽  
The Body ◽  
Structural Defects ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

We systematically introduced defects onto the body of multi-walled carbon nanotubes through an acid treatment, and the evolution of these defects was examined by Raman spectroscopy using different excitation wavelengths. The D and D′ modes are most prominent and responsive to defect formation caused by acid treatment and exhibit dispersive behavior upon changing the excitation wavelengths as expected from the double resonance Raman (DRR) mechanism. Several weaker Raman resonances including D″ and L1 (L2) + D′ modes were also observed at the lower excitation wavelengths (633 and 785 nm). In addition, specific structural defects including the typical pentagon-heptagon structure (Stone–Wales defects) were identified by Raman spectroscopy. In a closer analysis we also observed Haeckelite structures, specifically Ag mode response in R5,7 and O5,6,7.

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