Effects of heat treatment and contact resistance on the thermal conductivity of individual multiwalled carbon nanotubes using a Wollaston wire thermal probe

2012 ◽  
Vol 111 (5) ◽  
pp. 054321 ◽  
Author(s):  
Michael F. P. Bifano ◽  
Jungkyu Park ◽  
Pankaj B. Kaul ◽  
Ajit K. Roy ◽  
Vikas Prakash
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Contact Resistance ◽  
Multiwalled Carbon Nanotubes ◽  
Thermal Probe ◽  
Multiwalled Carbon

Thermal Conductivity of Heat Treated and Non-Heat Treated Individual Multiwalled Carbon Nanotubes

2011 ◽  
Author(s):  
Michael F. P. Bifano ◽  
Pankaj B. Kaul ◽  
Vikas Prakash
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Heat Treated Sample ◽  
Heat Treated ◽  
Treated Sample ◽  
Annealing Heat Treatment

Thermal conductivity measurements of commercially available CVD grown individual multiwalled carbon nanotubes (MWCNTs) are reported. The measurements are performed using the three-omega-based Wollaston T-Type probe method inside a scanning electron microscope (SEM). An average 385% increase in thermal conductivity is measured for those MWCNTs samples which undergo a 20 hour 3000°C post annealing heat treatment. However, in most samples qualitatively characterized defects are found to negate any advantage of the heat treatment process. The highest thermal conductivity measured is 893.0 W/mK and is of a heat-treated sample. These results will help to improve the quality of MWCNT production and aid in the development of highly efficient CNT-structured thermal management devices and engineering materials.

On the synthesis and thermal conductivity of nanocomposites with multiwalled carbon nanotubes

2015 ◽  
Vol 9 (4) ◽  
pp. 784-788 ◽  
Author(s):  
E. A. Vorobyeva ◽  
I. V. Makarenko ◽  
A. V. Makunin ◽  
V. A. Trifonov ◽  
N. G. Chechenin
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Thermal conductivity of individual multiwalled carbon nanotubes

2012 ◽  
Vol 62 ◽  
pp. 40-43 ◽  
Author(s):  
M.K. Samani ◽  
N. Khosravian ◽  
G.C.K. Chen ◽  
M. Shakerzadeh ◽  
D. Baillargeat ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Improved thermal conductivity of epoxy composites prepared with a mixed filler of multiwalled carbon nanotubes and aluminum nitride particles

2016 ◽  
Vol 29 (4) ◽  
pp. 484-492 ◽  
Author(s):  
Jian Jiao ◽  
Yonghong Cui ◽  
Yu Xia
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Aluminum Nitride ◽  
Multiwalled Carbon Nanotubes ◽  
Conductive Filler ◽  
Volume Resistivity ◽  
Phonon Transport ◽  
Multiwalled Carbon ◽  
Volume Percentage ◽  
The One

The thermal conductive filler/epoxy resin (EP) composites were prepared by a casting method. The effects of the multiwalled carbon nanotubes (MWCNTs), aluminum nitride (AlN) particles, and their compounds on the microstructure and thermal conductivity of the composites were investigated, in addition to the thermal properties. The results indicated that compounds of MWCNTs and AlN particles exhibited a remarkable synergistic effect to improve the thermal conductivity properties of the composites. The one-dimensional MWCNTs with superb thermal conductivity bridged the AlN particles to form an excellent network, which provides a faster and more effective pathway for phonon transport in the composites. The thermal conductivity of the 0.6 vol% MWCNTs/3.4 vol% AlN/EP composite is 0.53 W (m K)−1. In addition, the thermal conductivity of the MWCNTs/AlN/EP composites with 0.4 vol% MWCNTs and 3.4 vol% AlN is 0.48 W (m K)−1 (which is twice the value of 0.24 W (m K)−1 for the pure EP) which was much higher than the 0.4 vol% MWCNTs/EP composites (0.27 W (m K)−1) and the 3.4 vol% AlN/EP composites (0.28 W (m K)−1). Bruggeman’s equation is identified to fit quite well to the experimental results of the AlN/EP composites in the entire range of volume percentage of AlN; however, the MWCNTs/EP composites coincided better to the Russell equation. The volume resistivity of the MWCNTs/AlN/EP composites (approximately 1.8–2.6 × 1012 Ω m) exhibited only a slight compromise in comparison to the pure EP (2.5 × 1014 Ω m), which manifested the excellent insulation characteristic of these composites.

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