Current treatment of bulk single walled carbon nanotubes to heal defects without structural change for increased electrical and thermal conductivities

Nanoscale ◽  
2015 ◽  
Vol 7 (19) ◽  
pp. 8707-8714 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Azusa Oshima ◽  
Motoo Yumura ◽  
Don N. Futaba ◽  
Kenji Hata
Keyword(s):  
Carbon Nanotubes ◽  
Structural Change ◽  
Single Walled Carbon Nanotubes ◽  
Electrical Current ◽  
Current Treatment ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Thermal Conductivities

By applying electrical current with heat, we succeeded in improving the graphitization of single walled carbon nanotubes (SWCNTs) without increasing the diameter and wall number.

Ultrafast structural change in single-walled carbon nanotubes using a few-cycle pulse laser

2012 ◽  
Author(s):  
Takayoshi Kobayashi ◽  
Zhaogang Nie ◽  
Juan Du ◽  
Hiromichi Kataura ◽  
Youichi Sakakibara Sakakibara ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Structural Change ◽  
Pulse Laser ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Cycle Pulse

Novel Actuating System Based on a Composite of Single-Walled Carbon Nanotubes and an Ionomeric Polymer

2003 ◽  
Vol 785 ◽  
Author(s):  
Igor A. Levitsky ◽  
Peter T. Kanelos ◽  
William B. Euler
Keyword(s):  
Carbon Nanotubes ◽  
Composite Material ◽  
Mechanical Response ◽  
Single Walled Carbon Nanotubes ◽  
Electrical Current ◽  
Electrical Signal ◽  
Individual Layer ◽  
Single Walled Carbon ◽  
Current Decay ◽  
Walled Carbon Nanotubes

ABSTRACTWe report the fabrication and characterization of a novel composite material based on single walled carbon nanotubes (SWNT)s and the ionomeric polymer Nafion. SWNTs were airbrushed from a chloroform suspension onto both sides of a Nafion membrane (180 μm) and the electromechanical properties of the composite material were explored. The outer layers of carbon nanotubes acted as electrodes in order to pass electrical current through the system while the mechanical response was monitored. Under this design, the mechanical response could be characterized, with respect to the electrical signal, as a function of: voltage, waveform (AC vs. DC), and frequency (AC). Data was also compiled to gauge the effect of size and thickness of each individual layer of the system. The reference samples (graphite-Nafion and sputtered gold-Nafion) did not exhibit mechanical actuation at the same conditions. An analytical model for current decay was considered that is in agreement with the experimental data. Bi-exponential decay with a long time component was found for bias, which is above the actuating threshold. That was explained in terms of increasing of the water dielectric constant and polymer-SWNT interface area. The possible mechanisms of the actuation in this novel composite are discussed.

Molecular Dynamics Simulation of Thermal Conductivity of Single-Walled Carbon Nanotubes Filled With Water

2008 ◽  
Author(s):  
Li Deng ◽  
Yunfei Chen ◽  
Ruiming Qian ◽  
Juekuan Yang ◽  
Kedong Bi
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Single Walled Carbon Nanotubes ◽  
Phonon Transport ◽  
Dynamics Simulation ◽  
Tube Length ◽  
Water Molecules ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Thermal Conductivities

Thermal conductivities for single-walled carbon nanotubes (SWNTs) filled with water are calculated with non-equilibrium molecular dynamics (NEMD) simulation method. Simulation results demonstrate the thermal conduction for the tube filed with water is better than the pure nanotube at the same conditions. It is believed the translational movement of the water molecules along the tube axis helps carry energy from the hot bath to the heat sinks, which results in the increase of the thermal conductivities. In addition, with the introduction of the water molecules into the nanotube, the additional interaction between the carbon atoms and the water molecules provide extra channels for phonon transport, which further intensifies the energy transport along the nanotubes. The effects of the temperature variation and the tube length on the thermal conductivities are also analyzed in this paper.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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