A Novel Method for Sorting Single Wall Carbon Nanotubes by Length

2011 ◽  
Vol 1284 ◽  
Author(s):  
Shigekazu Ohmori ◽  
Takeshi Saito ◽  
Bikau Shukla ◽  
Motoo Yumura ◽  
Sumio Iijima
Keyword(s):  
Carbon Nanotubes ◽  
Complex Structure ◽  
Length Distribution ◽  
Cross Flow ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Pore Sizes ◽  
Cross Flow Filtration ◽  
Flow Filtration

ABSTRACTWe report a novel system for sorting single wall carbon nanotubes (SWCNTs) by length via cross-flow filtration with three membrane filters of different pore sizes, 1.0, 0.45, and 0.2 μm. SWCNTs dispersed in water with the help of polymer type detergents, such as sodium carboxymethylcellulose (CMC) and polyoxyethylene stearyl ether (Brij 700), were successfully fractionated into four samples, and the atomic force microscopy (AFM) observation of those samples confirmed that their length distribution peaks are within the expected ranges from pore sizes of used filters. However, the result of the similar filtration process using a non-polymer detergent, sodium dodecylbenzenesulfonate (SDBS), showed no pronounced correlation between the length distribution of SWCNTs and the pore size. The observed difference in the sorting phenomena caused by the detergent type suggests that the permeation property depends on the complex structure resulting from the dispersed SWCNTs and detergent molecules.

Fractionation of Single Wall Carbon Nanotubes by Length Using Cross Flow Filtration Method

ACS Nano ◽  
2010 ◽  
Vol 4 (7) ◽  
pp. 3606-3610 ◽  
Author(s):  
Shigekazu Ohmori ◽  
Takeshi Saito ◽  
Bikau Shukla ◽  
Motoo Yumura ◽  
Sumio Iijima
Keyword(s):  
Carbon Nanotubes ◽  
Cross Flow ◽  
Single Wall Carbon Nanotubes ◽  
Filtration Method ◽  
Single Wall Carbon ◽  
Cross Flow Filtration ◽  
Flow Filtration

In Situ Atomic Force Microscopy Tip-Induced Deformations and Raman Spectroscopy Characterization of Single-Wall Carbon Nanotubes

Nano Letters ◽  
2012 ◽  
Vol 12 (8) ◽  
pp. 4110-4116 ◽  
Author(s):  
P. T. Araujo ◽  
N. M. Barbosa Neto ◽  
H. Chacham ◽  
S. S. Carara ◽  
J. S. Soares ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Atomic Force Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force

Chromatographic Separation of Single Wall Carbon Nanotubes

2006 ◽  
Vol 922 ◽  
Author(s):  
Barry J. Bauer ◽  
Vardhan Bajpai ◽  
Jeffrey A. Fagan ◽  
Matthew L. Becker ◽  
Erik K. Hobbie
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Modification ◽  
Size Exclusion ◽  
Covalent Attachment ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force ◽  
Exclusion Chromatography ◽  
Chromatographic Detection

AbstractSize exclusion chromatography (SEC) has been used to separate single wall carbon nanotubes (SWNT) dispersed by chemical modification in organic solvents and by DNA in aqueous solution. The chromatographic detection includes size sensitive detectors, multi-angle light scattering (MALS) and intrinsic viscosity (IV), which can provide information on the size and shape of the SEC fractions. The dispersions were also characterized by small angle neutron scattering (SANS) and atomic force microscopy (AFM). Chemical modification was accomplished by covalent attachment of octadecyl amine to acid treated SWNT and by covalent attachment of butyl groups through free radical grafting. Both covalent attachment methods produced dispersions that contained impurities or clusters of SWNT. The DNA dispersions produced the best dispersions, being predominately single nanotubes.

SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF SALMON DNA-WRAPPED SINGLE-WALL CARBON NANOTUBES

NANO ◽  
2007 ◽  
Vol 02 (05) ◽  
pp. 295-299 ◽  
Author(s):  
YUKI ASADA ◽  
HIROFUMI DOHI ◽  
SHOTA KUWAHARA ◽  
TOSHIKI SUGAI ◽  
RYO KITAURA ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Near Infrared ◽  
Spectroscopic Characterization ◽  
Single Wall Carbon Nanotubes ◽  
Photoluminescence Spectra ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force ◽  
Spectral Shifts

Single-wall carbon nanotubes (SWNTs) can be well-dispersed in water by wrapping with short segments of natural DNA from salmon sperm. We report here the isolated DNA-wrapped SWNT hybrids. Measurements were carried out using UV-vis-NIR, near-infrared photoluminescence (PL) spectrum and atomic force microscopy (AFM). A possible charge transport between SWNTs and salmon-DNA is discussed in terms of observed spectral shifts in the photoluminescence spectra.

scholarly journals Quantitative Analysis of Isolated Single-Wall Carbon Nanotubes with Their Molar Absorbance Coefficients

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Shota Kuwahara ◽  
Yuki Kuwahara ◽  
Hisanori Shinohara
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Force Microscopy ◽  
Visible Region ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Density Gradient Ultracentrifugation ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force ◽  
Spray Technique

The molar absorbance coefficients of metallic, semiconducting, and (6,5) chirality enriched single-wall carbon nanotubes were evaluated by a spray technique combined with atomic force microscopy. Single-wall carbon nanotubes with isolated and a single predominant electronic type were obtained by using the density-gradient ultracentrifugation technique. In the visible region, all coefficients had similar values around 2–5 × 109/mL mol−1 cm−1, independent of their diameter distribution and the electronic types of single-wall carbon nanotubes, and theεS22/εM11 andεS11/εM11were estimated to be 1.0 and 4.0, respectively. The coefficient strongly depends on the length of single-wall carbon nanotubes, independent of their electronic types and chirality.

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