The Evaluation of Individual Dispersion of Single-Walled Carbon Nanotubes Using Absorption and Fluorescence Spectroscopic Techniques

2007 ◽  
Vol 7 (11) ◽  
pp. 3727-3730
Author(s):  
Dokyung Yoon ◽  
Sun-Jung Kang ◽  
Jae-Boong Choi ◽  
Young-Jin Kim ◽  
Seunghyun Baik
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Media ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Spectroscopic Techniques ◽  
Single Walled Carbon ◽  
Dispersion State ◽  
Semiconducting Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Nanotube Chirality

We have investigated the degree of dispersion of single-walled carbon nanotubes (SWNTs) in solution using laser spectroscopic techniques. SWNTs were suspended in aqueous media using a sodium dodecyl sulfate (SDS) surfactant. SWNTs with different dispersion states were prepared by controlling the intensity and duration of sonication and centrifugation. The absorption and fluorescence spectroscopic techniques were employed to characterize the different dispersion state of the prepared samples. Nanotube suspensions with better dispersion showed higher fluorescence and sharper absorption peaks. The fluorescence data were characterized as a function of the nanotube chirality, and absorption peak shifts were analyzed depending on the first and second van Hove singularities (vHs) of semiconducting nanotubes.

The Evaluation of Individual Dispersion of Single-Walled Carbon Nanotubes Using Absorption and Fluorescence Spectroscopic Techniques

2007 ◽  
Vol 7 (11) ◽  
pp. 3727-3730 ◽  
Author(s):  
Dokyung Yoon ◽  
Sun-Jung Kang ◽  
Jae-Boong Choi ◽  
Young-Jin Kim ◽  
Seunghyun Baik
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Media ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Spectroscopic Techniques ◽  
Single Walled Carbon ◽  
Dispersion State ◽  
Semiconducting Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Nanotube Chirality

We have investigated the degree of dispersion of single-walled carbon nanotubes (SWNTs) in solution using laser spectroscopic techniques. SWNTs were suspended in aqueous media using a sodium dodecyl sulfate (SDS) surfactant. SWNTs with different dispersion states were prepared by controlling the intensity and duration of sonication and centrifugation. The absorption and fluorescence spectroscopic techniques were employed to characterize the different dispersion state of the prepared samples. Nanotube suspensions with better dispersion showed higher fluorescence and sharper absorption peaks. The fluorescence data were characterized as a function of the nanotube chirality, and absorption peak shifts were analyzed depending on the first and second van Hove singularities (vHs) of semiconducting nanotubes.

Dispersing Single-Walled Carbon Nanotubes in Water by Adsorption of Polyphenols

2009 ◽  
Vol 620-622 ◽  
pp. 501-504
Author(s):  
Qiu Liao ◽  
Jing Sun ◽  
Lian Gao
Keyword(s):  
Carbon Nanotubes ◽  
Aromatic Compounds ◽  
Potential Application ◽  
Single Walled Carbon Nanotubes ◽  
Dispersion Interactions ◽  
Single Walled Carbon ◽  
Dispersion State ◽  
Ultrasonication Time ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes (SWCNTs) were dispersed in water with the assistance of polyphenols (resorcinol and pyrogallol). SWCNTs have intrinsic tendency to adsorb aromatic compounds due to π-π dispersion interactions, which leads to SWCNTs noncovalently dispersed in water by adsorption of resorcinol or pyrogallol. The concentration of SWCNT suspension was determined by the absorbance value at 500 nm using UV-Vis spectrometer. The effects of polyphenol concentration and ultrasonication time on the dispersion state have been investigated. Resorcinol of 0.5 mg/mL was found to be most effective for solubilizing SWCNTs in water. Over 60 % of SWCNTs were well dispersed with ultrasonication time for 4 hours. However, SWCNTs were cut shorter and damages could be introduced with prolonged ultrasonication time. TEM images showed that SWCNT bundles became thinner with the presence of polyphenols. These aromatic compounds provide an effective way to disperse SWCNTs in water and might have potential application in nanocomposite preparation.

METHODS FOR DISPERSION AND ALIGNMENT OF SINGLE-WALLED CARBON NANOTUBES AND EFFECTS ON THEIR STRUCTURAL AND ELECTRONIC PROPERTIES

2006 ◽  
Vol 05 (04n05) ◽  
pp. 407-411
Author(s):  
JUN JIAO ◽  
LIFENG DONG ◽  
VACHARA CHIRAYOS ◽  
JOCELYN BUSH ◽  
JAMES HEDBERG
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Dielectric Medium ◽  
High Yield ◽  
Single Walled Carbon ◽  
Transmission Electron ◽  
The Individual ◽  
Walled Carbon Nanotubes

Two effective methods for dispersion and alignment of single-walled carbon nanotubes (SWCNTs) were developed. One is the floating-potential dielectrophoresis (FPD) method, which can achieve the alignment of individual SWCNTs between two electrodes with high yield (more than 30%) and high repeatability. The second is the gas blow method. Using the shear forces associated with a rapidly moving fluid, SWCNTs were positioned in a direction corresponding to the flow vector of the fluid. This technique shows great potential for scaling up the displacement of SWCNTs with controlled orientations. Various dispersion agents including ethanol, dichlorobenzene, sodium dodecyl sulfate (SDS) and DNA were investigated with these two methods. It was found that SDS was the most effective dielectric medium used for FPD dispersion and alignment of SWCNTs. The result of electric measurement for the individual SWCNTs aligned between two electrodes suggests that, using the FPD method, both metallic and semiconducting SWCNTs could be aligned between the electrodes. The individual SWCNT resistances measured range from 20 KΩ to 5 MΩ suggesting a high contact resistance between an aligned SWCNT and metal electrodes. High resolution transmission electron microscopy (TEM) and scanning electron microscopy (SEM) characterization reveal DNA molecules wrapped around the SWNCTs after the dispersion process which may affect the intrinsic properties of SWCNTs.

Functionalization of single-walled carbon nanotubes: Chemistry and characterization

2017 ◽  
Author(s):  
R. Graupner ◽  
F. Hauke
Keyword(s):  
Carbon Nanotubes ◽  
Nir Spectroscopy ◽  
Single Walled Carbon Nanotubes ◽  
Covalent Attachment ◽  
Spectroscopic Techniques ◽  
Force Microscopy ◽  
Single Walled Carbon ◽  
Transmission Electron ◽  
Tunnelling Microscopy ◽  
Walled Carbon Nanotubes

This article examines the chemical functionalization and structural alteration of single-walled carbon nanotubes (SWCNTs). It describes the covalent functionalization of the SWCNT framework that is the covalent attachment of functional entities onto the CNT scaffold. In particular, it considers the chemical modification and reactivity of SWCNTs in the context of the reactivity of graphite and fullerenes. It also discusses the defect and sidewall functionalization of SWCNTs, along with various techniques used in the characterization ofSWCNTs upon functionalization, namely: thermogravimetric analysis, spectroscopic techniques such as UV-Vis-NIR spectroscopy and Raman spectroscopy, and microscopic techniques like transmission electron microscopy, atomic force microscopy and scanning tunnelling microscopy.

Organic Soft Template Method to Arrange Palladium Nanoparticles on Single-Walled Carbon Nanotubes

2011 ◽  
Vol 284-286 ◽  
pp. 750-754
Author(s):  
Zhenquan Tan ◽  
Hiroya Abe ◽  
Mikio Naito ◽  
Satoshi Ohara
Keyword(s):  
Carbon Nanotubes ◽  
Self Assembly ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Pd Nanoparticles ◽  
Soft Template ◽  
Chemical Route ◽  
Single Walled Carbon ◽  
Adsorption Sites ◽  
Walled Carbon Nanotubes

A facile solution-chemical route was reported to deposit and arrange palladium (Pd) nanoparticles on single-walled carbon nanotubes (SWCNTs) using sodium dodecyl sulfate (SDS) as an organic soft template. SDS was previously formed supramolecular self-assembly on the walls of SWCNTs, which may act as adsorption sites of Pd (II) ions on SWCNTs. The Pd nanoparticles reduced by photo-reduction and formed one-dimensionally ordered arrangement on the surface of SWCNTs with a veriety of helices and tilted angles. Pd nanoparticles have an average size of 3 nm. The structure (distance, helix and tilted angle) of the ordered arrangements were determined by the supramolecular self-assembly of SDS wrapped on SWCNTs.

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