Interactive Forces between Sodium Dodecyl Sulfate-Suspended Single-Walled Carbon Nanotubes and Agarose Gels

2013 ◽  
Vol 135 (47) ◽  
pp. 17758-17767 ◽  
Author(s):  
Justin G. Clar ◽  
Carlos A. Silvera Batista ◽  
Sejin Youn ◽  
Jean-Claude J. Bonzongo ◽  
Kirk J. Ziegler
Keyword(s):  
Carbon Nanotubes ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Agarose Gels ◽  
Single Walled Carbon ◽  
Dodecyl Sulfate ◽  
Walled Carbon Nanotubes

Optical absorption spectrum of single-walled carbon nanotubes dispersed in sodium cholate and sodium dodecyl sulfate

2008 ◽  
Vol 23 (3) ◽  
pp. 632-636 ◽  
Author(s):  
Inderpreet Singh ◽  
P.K. Bhatnagar ◽  
P.C. Mathur ◽  
L.M. Bharadwaj
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectrum ◽  
Sodium Dodecyl Sulfate ◽  
Near Infrared ◽  
Sodium Dodecyl ◽  
Single Walled Carbon Nanotubes ◽  
Sodium Cholate ◽  
Single Walled Carbon ◽  
Dodecyl Sulfate ◽  
Walled Carbon Nanotubes

Commercially procured single-walled carbon nanotubes were dispersed in 2 wt% solution of sodium cholate and also in 1 wt% solution of sodium dodecyl sulfate. The absorption spectrum of the suspensions was studied in ultraviolet–visible–near-infrared (UV–vis–NIR) range. Two distinct bands, each containing three peaks, were observed in NIR range for both the suspensions. These peaks correspond to transitions between van Hove singularities E11 and E22 in the density of states of the semiconducting nanotubes. Comparing positions of the observed peaks with the empirical Kataura plot, the diameters and chiralities of the nanotubes were estimated. Using tight binding approximations, the diameter of the nanotubes was also estimated theoretically. Discrepancies between the theoretically calculated diameters and those obtained by empirical Kataura plots are found to be higher for E11 peaks. It has been suggested that the reason for this discrepancy is that the observed E11 peaks are blue-shifted due to Coulomb interactions and exciton formation.

Single Walled Carbon Nanotube Assisted Thermal Sensor

2014 ◽  
Vol 1752 ◽  
pp. 111-116
Author(s):  
S. Chandrasekar ◽  
K.S.V. Santhanam ◽  
Y. Yue ◽  
K. Kalaiazagan ◽  
L. Fuller
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Sodium Dodecyl Sulfate ◽  
Electrical Resistance ◽  
Methylene Chloride ◽  
Active Material ◽  
Sodium Dodecyl ◽  
Thermal Sensor ◽  
Single Walled Carbon ◽  
Dodecyl Sulfate

ABSTRACTA nano thermal sensor was made by depositing carbon nanotubes from a medium containing a) methylene chloride b)sodium dodecyl sulfate and c) Baytron-P (polymer) assisted sodium dodecyl sulfate. The nano thermal sensors showed d.c. electrical resistance as independent of temperature when the sensors were made by procedures (a) or (b). The electrical resistivity in both the situations has been independent of temperature. When the nanosensor is made with carbon nanotubes by assisted method (c), the d.c. electrical resistance decreased with temperature. The negative temperature coefficient (TCR) is manifested in the semiconducting property of the active material. The sensor behavior is reproducible and varies linearly with temperature. The nanosensor made by non assisted carbon nanotube showed zero TCR. This is probably the first instance of assisted thermal sensor made with single walled carbon nanotubes.

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.

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.

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