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.

Application of the G'/D Raman Ratio for Purity Assessment of Multi-Walled Carbon Nanotubes

2007 ◽  
Vol 1018 ◽  
Author(s):  
Roberta DiLeo ◽  
Brian Landi ◽  
Ryne Raffaelle
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Excitation Energy ◽  
Double Resonance ◽  
Raman Shift ◽  
Resonance Theory ◽  
Sem Images ◽  
Purity Assessment ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractCarbonaceous purity assessment methods are being sought after for all types of carbon nanotubes as a means to standardize the material metrology. Our most recent work has evaluated chemical vapor synthesized multi-walled carbon nanotubes (MWNTs). This effort included a protocol for assessment involving qualitative information from scanning electron microscopy (SEM) images and quantitative information from thermogravimetric analysis (TGA) and Raman spectroscopy. Presently, the analysis using Raman spectroscopy on a constructed sample set has been extended to a second excitation energy (HeNe laser at 1.96 eV) and the similar trends in the relative Raman peak ratios have been measured. In contrast to the G-band, the D and G' peaks demonstrate a Raman shift that is excitation energy-dependent, consistent with the double resonance theory. However, the Raman ratio of IG'/ID is independent of excitation energy and is observed to be the most sensitive to MWNT carbonaceous purity. Application of this approach to MWNT arrays grown on SiO2 is compared to conventional bulk powders synthesized under similar conditions. The MWNT arrays show a high degree of vertical alignment based upon SEM and a measured carbonaceous purity using the IG'/ID ratio of 75% w/w.

scholarly journals Effects of structural defects on strength and fracture properties of multi-walled carbon nanotubes

2017 ◽  
Vol 83 (847) ◽  
pp. 16-00283-16-00283 ◽  
Author(s):  
Itaru TAMAKI ◽  
Keiichi SHIRASU ◽  
Takamichi MIYAZAKI ◽  
Go YAMAMOTO ◽  
Raman BEKAREVICH ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Structural Defects ◽  
Fracture Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Surface-enhanced Raman spectroscopy characterisation of functionalised multi-walled carbon nanotubes

2015 ◽  
Vol 17 (33) ◽  
pp. 21373-21380 ◽  
Author(s):  
Sabina Botti ◽  
Susanna Laurenzi ◽  
Luca Mezi ◽  
Alessandro Rufoloni ◽  
M. Gabriella Santonicola
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Spectral Features ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

By applying SERS, we recorded spectral features from functional molecules bound to the nanotube surface, which are otherwise very difficult to see.

scholarly journals A study on the dependence of structure of multi-walled carbon nanotubes on acid treatment

2015 ◽  
Vol 5 (3) ◽  
pp. 287-293 ◽  
Author(s):  
S. Sahebian ◽  
S. M. Zebarjad ◽  
J. vahdati Khaki ◽  
A. Lazzeri
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

STM/STS investigation of carbon nanotubes deposited on Bi2Te3 surface

Open Physics ◽  
2009 ◽  
Vol 7 (2) ◽  
Author(s):  
Maciej Bazarnik ◽  
Maciej Cegiel ◽  
Piotr Biskupski ◽  
Monika Jazdzewska ◽  
SÅ‚awomir Mielcarek ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Structural Defects ◽  
Scanning Tunneling ◽  
Narrow Gap ◽  
Tunneling Microscopy ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Walled Cnts

AbstractThis paper reports our scanning tunneling microscopy and spectroscopy (STM/STS) study of double-walled and multi-walled carbon nanotubes (CNTs) of different diameter deposited on Bi2Te3 (narrow gap semiconductor). The approximate diameter of the studied double-walled and multi-walled CNTs was 2 nm and 8 nm, respectively. Crystalline Bi2Te3 was used as a substrate to enhance the contrast between the CNTs and the substrate in the STS measurements performed to examine peculiarities of CNT morphology, such as junctions, ends or structural defects, in terms of their electronic structure.

scholarly journals Polyanilino-Carbon Nanotubes Derivatised Cytochrome P450 2E1 Nanobiosensor for the Determination of Pyrazinamide Anti-Tuberculosis Drugs

Nano Hybrids ◽  
2014 ◽  
Vol 6 ◽  
pp. 59-73 ◽  
Author(s):  
Unathi Sidwaba ◽  
Rachel F. Ajayi ◽  
Usisipho Feleni ◽  
Samantha Douman ◽  
Priscilla Gloria Lorraine Baker ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cytochrome P450 ◽  
The Body ◽  
Tb Treatment ◽  
Biosensor System ◽  
Electrochemically Deposited ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Dynamic Linear Range

Pyrazinamine (PZA) is one of the most commonly prescribed anti-tuberculosis (anti-TB) drug due to its ability to significantly shorten the TB treatment period. However, excess PZA in the body causes hepatotoxicity and liver damage. This, therefore, calls for new methods for ensuring reliable dosing of the drug, which will differ from person to person due to interindividual differences in drug metabolism. A novel biosensor system for monitoring the metabolism of PZA was prepared with nanocomposite of multi-walled carbon nanotubes (MWCNTs), polyaniline (PANI) and cytochrome P450 3A4 (CYP3A4) electrochemically deposited on a glassy carbon electrode (GCE). The nanocomposite biosensor system exhibited enhanced electroactivity that is attributable to the catalytic effect of the incorporated MWCNTs. The biosensor had a sensitivity of 7.80 μA/μg mL-1 PZA and a dynamic linear range of 4.92 160 ng/mL PZA.

Resonance Raman Scattering of Multi-Walled Carbon Nanotubes

1999 ◽  
Vol 593 ◽  
Author(s):  
H. Kataura ◽  
Y Achiba ◽  
X. Zhao ◽  
Y Ando
Keyword(s):  
Carbon Nanotubes ◽  
Raman Scattering ◽  
Resonance Effect ◽  
Resonance Raman ◽  
Radial Breathing Mode ◽  
Hydrogen Gas ◽  
Resonance Raman Scattering ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Arc ◽  
Walled Carbon Nanotubes

ABSTRACTMulti-walled carbon nanotubes synthesized by the carbon arc in hydrogen gas have very thin core channels. We have measured resonance Raman scattering of some samples synthesized in different conditions, and have observed radial breathing mode (RBM) peaks from 200 to 500 cm−1. Resonance effect of each peak is similar to that of single-walled nanotube. However, the peak frequencies are about 5 % higher than those of single-walled nanotubes, which is probably due to the inter-layer interaction. Further, the highest RBM peak splits in three peaks. The result on the resonance effect and the zone-folding band calculation suggest that the thinnest core nanotube is (4,3) that have four candidates of second outer nanotubes. This suggests that the different outer nanotube gives different degree of the interlayer interaction.

Effects of acid treatment duration and sulfuric acid molarity on purification of multi-walled carbon nanotubes

Open Physics ◽  
2010 ◽  
Vol 8 (6) ◽  
Author(s):  
Seyedeh Mortazavi ◽  
Abdul Novinrooz ◽  
Ali Reyhani ◽  
Soghra Mirershadi
Keyword(s):  
Carbon Nanotubes ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Treatment Duration ◽  
Acid Treatment ◽  
Bimetallic Catalyst ◽  
Chemical Vapor ◽  
Destructive Effect ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractMulti-walled carbon nanotubes were synthesized using a Fe-Ni bimetallic catalyst supported by MgO using thermal chemical vapor deposition. Purification processes to remove unwanted carbon structures and other metallic impurities were carried out by boiling in sulfuric acid solution. Various analytical techniques such as TGA/DSC, Raman spectroscopy, SEM, HRTEM and EDAX were employed to investigate the morphology, graphitization and quality of the carbon nanotubes. The obtained results reveal the molarity of sulfuric acid and immersed time of the carbon nanotubes in the acid solution is very effective at purifying multi-walled carbon nanotubes. It was also found that 5 M concentration of boiling sulfuric acid for a 3 h treatment duration led to the highest removal of the impurities with the least destructive effect. Moreover, it was observed that acid treatment results in decreasing of CNTs’ diameter.

Synthesis of Carbon Nanotubes Using Plant Source and Study their Properties

2021 ◽  
Vol 19 (11) ◽  
pp. 95-101
Author(s):  
Athraa Mohamed Rashed ◽  
Abdulqadier Hussien Al Khazraji
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Activated Charcoal ◽  
Citrus Aurantium ◽  
Deposition Method ◽  
Fesem Image ◽  
Plant Source ◽  
Multi Walled Carbon Nanotubes ◽  
Synthesis Of Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this study the normal and activated charcoal were used to prepare normal and activated multi walled carbon nanotubes (MWCNTs) from same plant (Citrus aurantium) which is a source of carbon by Chemical Flame Deposition method (CFDM). The obtained products were analyzed using FESEM, FTIR, XRD, and Raman spectroscopy. The FESEM image of normal charcoal revealed that it has much less nanopores than activated charcoal. The ratios of ID/IG for the normal and activated MWCNTs were 0.85 and 0.91 respectively, which shows that use activated charcoal as a source enhance the disorder and the defects on the carbon nanotubes. The results demonstrate and confirmed that a carbon nanotubes which were prepared from normal and activated charcoal have some disfigurements and have converging diameter nearly (31-88 nm) and (37-70nm) for normal and activated MWCNTs with length about (1-2) μm respectively.

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