(Invited) Tube Length Dependence of Far-Infrared Absorption of Single-Walled Carbon Nanotubes

2012 ◽  
Keyword(s):  
Carbon Nanotubes ◽  
Infrared Absorption ◽  
Far Infrared ◽  
Single Walled Carbon Nanotubes ◽  
Tube Length ◽  
Single Walled Carbon ◽  
Length Dependence ◽  
Walled Carbon Nanotubes

Development of Transparent Conductive Single-Walled Carbon Nanotubes Films

2012 ◽  
Author(s):  
E. Kok ◽  
J. N. Tey ◽  
J. Wei
Keyword(s):  
Carbon Nanotubes ◽  
Sheet Resistance ◽  
Single Walled Carbon Nanotubes ◽  
Tube Length ◽  
Agarose Gel ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

In our research, we aim to formulate SWNTs ink and develop a methodology to create enhanced conductive flexible transparent SWNTs films that have the potential to possibly reduce the use of ITO. In our preliminary findings, we achieved a sheet resistance of 25.1 kΩ/sq with ∼93% transparency (excluding film) by spraying a unsorted purified pristine SWNTs. In-house separated M-SWNTs, prepared using agarose gel separation methods, were sprayed with sheet resistance of 3.3 kΩ/sq and ∼86% transparent.. Investigation of tube length with respect to conductivity was also studied — nanotubes were sonicated for different durations (thus affecting tube length) before separation and spraying.

ROLE OF THREE-PHONON AND FOUR-PHONON PROCESSES IN THERMAL TRANSPORT OF SINGLE-WALLED CARBON NANOTUBES

2013 ◽  
Vol 27 (16) ◽  
pp. 1350117 ◽  
Author(s):  
P. SAPNA ◽  
T. J. SINGH
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Independent Effect ◽  
Tube Length ◽  
Single Walled Carbon ◽  
Optical Modes ◽  
Semiconducting Nanotubes ◽  
Walled Carbon Nanotubes

Thermal conductivity of single-walled carbon nanotubes has been calculated considering the three-phonon and four-phonon processes. The contribution of the acoustic modes and optical modes in the relaxation rate of the phonon–phonon interaction and hence to the thermal conductivity have been considered. The thermal conductivity has been calculated for the (8, 0), (10, 0), (11, 0) and (13, 0) zigzag semiconducting nanotubes having different radii. It is found that the thermal conductivity increases linearly at low temperatures which is nearly T2 below 30 K and after reaching a peak, it decreases as aT-1 - bT-2 where a and b are constants and b > a at higher temperatures. It is also found that the thermal conductivity increases with increasing radius of the tube due to the independent effect of three-phonon process and four-phonon process. The thermal conductivity is also found to decrease with increasing tube length due to four-phonon process.

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