Thermal Expansion of Single Wall Carbon Nanotubes

2004 ◽  
Vol 126 (3) ◽  
pp. 265-270 ◽  
Author(s):  
H. Jiang ◽  
B. Liu ◽  
Y. Huang ◽  
K. C. Hwang
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Expansion ◽  
High Temperature ◽  
Analytical Method ◽  
Room Temperature ◽  
Radial Direction ◽  
Coefficient Of Thermal Expansion ◽  
Axial Direction ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

We have developed an analytical method to determine the coefficient of thermal expansion (CTE) for single wall carbon nanotubes (CNTs). We have found that all CTEs are negative at low and room temperature and become positive at high temperature. As the CNT diameter decreases, the range of negative CTE shrinks. The CTE in radial direction of the CNT is less than that in the axial direction for armchair CNTs, but the opposite holds for zigzag CNTs. The radial CTE is independent of the CNT helicity, while the axial CTE shows a strong helicity dependence.

Electrical Resistance of Single-Wall Carbon Nanotubes with Determined Chiral Indices

2009 ◽  
Vol 1204 ◽  
Author(s):  
Letian Lin ◽  
Lu-Chang Qin ◽  
Sean Washburn ◽  
Scott Paulson
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Vapor Deposition ◽  
Electrical Resistance ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Transmission Electron ◽  
Highly Sensitive

AbstractThe properties of a carbon nanotube (CNT), in particular a single-wall carbon nanotube (SWNT), are highly sensitive to the atomic structure of the nanotube described by its chirality (chiral indices). We have grown isolated SWNTs on a silicon substrate using chemical vapor deposition (CVD) and patterned sub-micron probes using electron beam lithography. The SWNT was exposed by etching the underlying substrate for transmission electron microscope (TEM) imaging and diffraction studies. For each individual SWNT, its electrical resistance was measured by the four-probe method at room temperature and the chiral indices of the same SWNT were determined by nano-beam electron diffraction. The contact resistances were reduced by annealing to typically 3-5 kΩ. We have measured the I-V curve and determined the chiral indices of each nanotube individually from four SWNTs selected randomly – two are metallic and two are semiconducting. We will present the electrical resistances in correlation with the carbon nanotube diameter as well as the band gap calculated from the determined chiral indices for the semiconducting carbon nanotubes. These experimental results are also discussed in connection with theoretical estimations.

The Influence of Microstructure, Heat-Treatment and Type of Crystal Lattice of Iron Aluminides on Coefficient of Thermal Expansion

2016 ◽  
Vol 368 ◽  
pp. 41-44 ◽  
Author(s):  
Martin Švec
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Thermal Expansion ◽  
High Temperature ◽  
Room Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Iron Aluminides ◽  
Sharp Drop ◽  
Structural Application ◽  
Phase Transition Temperatures

The iron aluminides seem to be very perspective materials for high temperature structural application. They have many advantages, but unfortunately also some negative properties – e.g. sharp drop in strength above 600°C or limited ductility at room temperature. These disadvantages can be reduced by alloying of binary alloy by other elements.Present work deals with a study of coefficient of thermal expansion (CTE). It was investigated the influence of microstructure and heat-treatment on the values of CTE. Secondary, it was studied the possibilities, how to determine phase transition temperatures from CTE curves. Influence of type of iron aluminides lattice on CTE values was also examined as well as the influence of addition of alloying elements into binary iron aluminides.

scholarly journals Single wall carbon nanotubes loaded with Pd and NiPd nanoparticles for H2 sensing at room temperature

Carbon ◽  
2014 ◽  
Vol 66 ◽  
pp. 599-611 ◽  
Author(s):  
Jaime García-Aguilar ◽  
Izaskun Miguel-García ◽  
Ángel Berenguer-Murcia ◽  
Diego Cazorla-Amorós
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

High temperature rearrangement of disordered nanoporous carbon at the interface with single wall carbon nanotubes

Carbon ◽  
2009 ◽  
Vol 47 (10) ◽  
pp. 2303-2309 ◽  
Author(s):  
Bo Yi ◽  
Ramakrishnan Rajagopalan ◽  
Christopher L. Burket ◽  
Henry C. Foley ◽  
Xiaoming Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Nanoporous Carbon ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Production of fullerenes and single-wall carbon nanotubes by high-temperature pulsed arc discharge

2000 ◽  
Vol 112 (13) ◽  
pp. 6000-6005 ◽  
Author(s):  
Toshiki Sugai ◽  
Hideki Omote ◽  
Shunji Bandow ◽  
Nobuo Tanaka ◽  
Hisanori Shinohara
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Arc Discharge ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Pulsed Arc Discharge ◽  
Pulsed Arc
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