scholarly journals Detailed analysis of the mean diameter and diameter distribution of single-wall carbon nanotubes from their optical response

2002 ◽  
Vol 66 (4) ◽  
Author(s):  
X. Liu ◽  
T. Pichler ◽  
M. Knupfer ◽  
M. S. Golden ◽  
J. Fink ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Detailed Analysis ◽  
Optical Response ◽  
Diameter Distribution ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Mean Diameter ◽  
The Mean

CONTROLLABLE CHEMICAL VAPOR DEPOSITION SYNTHESIS OF SINGLE-WALL CARBON NANOTUBES USING MIST FLOW METHOD

NANO ◽  
2012 ◽  
Vol 07 (06) ◽  
pp. 1250045 ◽  
Author(s):  
YUN SUN ◽  
RYO KITAURA ◽  
TAKUYA NAKAYAMA ◽  
YASUMITSU MIYATA ◽  
HISANORI SHINOHARA
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Single Wall Carbon Nanotubes ◽  
Flow Method ◽  
Mist Flow ◽  
Mean Diameter ◽  
The Mean

The influences of synthesis parameters on the mean diameter and diameter distribution of as-grown single-wall carbon nanotubes (SWCNTs) with chemical vapor deposition (CVD) using the mist flow method have been investigated in detail with Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We found that CVD reaction temperature and flow rate play an essential role in controlling the mean diameter and the quality of as-grown SWCNTs. Furthermore, we found that the carbon supply kinetics can be a dominant factor to determine the diameter of as-grown SWCNTs in the present mist flow method. Under a different combination of various parameters, the mean diameter of SWCNTs can be varied from 0.9 nm to 1.5 nm controllably.

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

scholarly journals Excitonic signatures in the optical response of single-wall carbon nanotubes

2012 ◽  
Vol 249 (5) ◽  
pp. 900-906 ◽  
Author(s):  
Christophe Voisin ◽  
Sébastien Berger ◽  
Stéphane Berciaud ◽  
Hugen Yan ◽  
Jean-Sébastien Lauret ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Response ◽  
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.

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