In situ imaging and spectroscopy of single-wall carbon nanotube synthesis by laser vaporization

2000 ◽  
Vol 76 (2) ◽  
pp. 182-184 ◽  
Author(s):  
A. A. Puretzky ◽  
D. B. Geohegan ◽  
X. Fan ◽  
S. J. Pennycook
Keyword(s):  
Carbon Nanotube ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Imaging And Spectroscopy ◽  
Carbon Nanotube Synthesis ◽  
In Situ Imaging

Time-resolved diagnostics and mechanisms of single-wall carbon nanotube synthesis by the laser vaporization technique

2001 ◽  
Author(s):  
David B. Geohegan ◽  
Alexander A. Puretzky ◽  
Xudong Fan ◽  
Stephen J. Pennycook ◽  
Michael A. Guillorn ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotube ◽  
Time Resolved ◽  
Single Wall Carbon ◽  
Carbon Nanotube Synthesis

scholarly journals Time-resolved diagnostics of single wall carbon nanotube synthesis by laser vaporization

2002 ◽  
Vol 197-198 ◽  
pp. 552-562 ◽  
Author(s):  
Alex A Puretzky ◽  
David B Geohegan ◽  
Henrik Schittenhelm ◽  
Xudong Fan ◽  
Michael A Guillorn
Keyword(s):  
Carbon Nanotube ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotube ◽  
Time Resolved ◽  
Single Wall Carbon ◽  
Carbon Nanotube Synthesis

Dynamics of single-wall carbon nanotube synthesis by laser vaporization

2000 ◽  
Vol 70 (2) ◽  
pp. 153-160 ◽  
Author(s):  
A.A. Puretzky ◽  
D.B. Geohegan ◽  
X. Fan ◽  
S.J. Pennycook
Keyword(s):  
Carbon Nanotube ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Carbon Nanotube Synthesis

In situ Raman spectro-electrochemistry study of single-wall carbon nanotube mat

2004 ◽  
Vol 13 (4-8) ◽  
pp. 1314-1321 ◽  
Author(s):  
S. Gupta ◽  
M. Hughes ◽  
A.H. Windle ◽  
J. Robertson
Keyword(s):  
Carbon Nanotube ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
In Situ Raman

Electrochemical Tuning of Single-Wall Carbon Nanotube Mat and Investigations on Actuator Mechanism

2004 ◽  
Vol 855 ◽  
Author(s):  
S. Gupta ◽  
M. Hughes ◽  
J. Robertson
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Carbon Nanotube ◽  
Bond Length ◽  
Upper Bound ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Electrochemical Tuning

ABSTRACTElectrochemical tuning of single-wall carbon nanotubes has been investigated using in situ Raman spectroscopy. We built a linear actuator from single-wall carbon nanotube mat and studied in several alkali metal (Li, Na, and K) and alkaline earth (Ca) halide solutions. The variation of bonding with electrochemical biasing was monitored using in situ Raman. This is since Raman can detect changes in C-C bond length: the radial breathing mode (RBM) at ∼190 cm−1 varies inversely with the nanotube diameter and the G band at ∼1590 cm−1 varies with the axial bond length. In addition, the intensities of both the modes vary significantly in a nonmonotonic manner pointing at the emptying/depleting or filling of the bonding and anti-bonding states - electrochemical charge injection. We discuss the variation of spectroscopic observables (intensity/frequency) of these modes providing valuable information on the charge transfer dynamics on the single-wall carbon nanotubes mat surface. We found the in-plane compressive strain (∼ -0.25%) and the charge transfer per carbon atom (fc ∼ -0.005) as an upper bound for the electrolytes used i.e. CaCl2. These results can be quantitatively understood in terms of the changes in the energy gaps between the one-dimensional van Hove singularities in the electron density of states arising possibly due to the alterations in the overlap integral of π bonds between the p orbitals of the adjacent carbon atoms. Moreover, the extent of variation of the absolute potential of the Fermi level or alternatively modification of band gap is estimated from modeling Raman intensity to be around 0.1 eV as an upper bound for CaCl2.

Control of electron transport related defects in in situ fabricated single wall carbon nanotube devices

2006 ◽  
Vol 89 (13) ◽  
pp. 133124 ◽  
Author(s):  
Zhixian Zhou ◽  
R. Jin ◽  
Gyula Eres ◽  
Alaska Subedi ◽  
D. Mandrus
Keyword(s):  
Carbon Nanotube ◽  
Electron Transport ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Carbon Nanotube Devices

Single-wall carbon nanotube synthesis by CO disproportionation on nickel-incorporated MCM-41

2005 ◽  
Vol 16 (7) ◽  
pp. S476-S483 ◽  
Author(s):  
Yuan Chen ◽  
Dragos Ciuparu ◽  
Yanhui Yang ◽  
Sangyun Lim ◽  
Chuan Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Co Disproportionation ◽  
Carbon Nanotube Synthesis ◽  
Mcm 41

Investigations of single-wall carbon nanotube growth by time-restricted laser vaporization

2002 ◽  
Vol 65 (24) ◽  
Author(s):  
Alex A. Puretzky ◽  
Henrik Schittenhelm ◽  
Xudong Fan ◽  
Michael J. Lance ◽  
Larry F. Allard ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth
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