Reduced diameter distribution of single-wall carbon nanotubes by selective oxidation

2002 ◽  
Vol 363 (5-6) ◽  
pp. 567-572 ◽  
Author(s):  
E Borowiak-Palen ◽  
T Pichler ◽  
X Liu ◽  
M Knupfer ◽  
A Graff ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Selective Oxidation ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Diameter distribution of single wall carbon nanotubes in nanobundles

2000 ◽  
Vol 18 (2) ◽  
pp. 201-205 ◽  
Author(s):  
S. Rols ◽  
A. Righi ◽  
L. Alvarez ◽  
E. Anglaret ◽  
R. Almairac ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Diameter Control in the Formation of Single-Wall Carbon Nanotubes

1999 ◽  
Vol 593 ◽  
Author(s):  
Rahul Sen ◽  
Y. Ohtsuka ◽  
T. Ishigaki ◽  
D. Kasuya ◽  
S. Suzuki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Flow Rate ◽  
Relative Yield ◽  
Target Position ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Graphite Target ◽  
Argon Gas ◽  
Single Wall Carbon ◽  
Hot Zone

ABSTRACTSingle-wall carbon nanotubes (SWNTs) have been synthesized by laser ablation of Ni/Co catalyzed graphite target at 1200°C in argon gas. Raman spectroscopy has been used to study the effect of target position in the furnace and flow rate of argon gas on the diameter distribution of SWVNTs. It was found that yield of smaller diameter SWNTs relatively increases as target is placed away from the hot zone of the furnace. The relative yield of smaller diameter SWNTs decreases with increase in flow rate of the argon gas.

scholarly journals Reversible electron charge transfer in single-wall carbon nanotubes

2008 ◽  
Vol 10 (2) ◽  
pp. 1-4 ◽  
Author(s):  
Sara Costa ◽  
Alicja Bachmatiuk ◽  
Ewa Borowiak-Palen
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Electronic Properties ◽  
Acid Treatment ◽  
Diameter Distribution ◽  
Optical Absorption Spectroscopy ◽  
Single Wall Carbon Nanotubes ◽  
Electron Charge ◽  
Single Wall Carbon ◽  
Electron Charge Transfer

Reversible electron charge transfer in single-wall carbon nanotubes Single-wall carbon nanotubes (SWCNT) have proved to be very special materials due to their unique electronic properties. Over the last years many scientists have dedicated their research to the study of the these materials as an electronic system. Amphoteric doping effects (n-type and p-type), which can be reversed, became a very popular way of manipulating the optic and electronic properties of carbon nanotubes. In the particular case of SWCNT, the most common and widely used procedure, which changes their properties, is acid treatment applied as a purification procedure. The effect of the addition of this kind of the dopant has been widely studied but not fully understood so far. Here, we present a study, of two kinds of SWCNT, produced within different techniques: (i) chemical vapors deposition and (ii) laser ablation. The main difference between the two types is the diameter distribution of the obtained materials, which is broad in the first technique and narrow in the second. After the acid treatment it is possible to observe a diameter sensitive doping effect on both samples. Resonance Raman spectroscopy, optical absorption spectroscopy (OAS) in UV/Vis/NIR and the Fourier transform middle-infrared (FTIR) spectroscopy have been applied for the characterization of the samples.

Effect of the Growth Temperature on the Diameter Distribution and Chirality of Single-Wall Carbon Nanotubes

1998 ◽  
Vol 80 (17) ◽  
pp. 3779-3782 ◽  
Author(s):  
Shunji Bandow ◽  
S. Asaka ◽  
Y. Saito ◽  
A. M. Rao ◽  
L. Grigorian ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Growth Temperature ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

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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