Metal–semiconductor transitions under uniaxial stress for single- and double-walled carbon nanotubes

Charlier, A.; McRae, E.; Heyd, Rodolphe; Charlier, Marie-France

doi:10.1016/s0022-3697(00)00074-3

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…Because the variation of energy levels with the strain is different for different sub-bands, at certain strain the energy levels of sub-bands cross over, thus the band gap as a function of the torsional strain exhibits periodic behavior for large strain [20]. This oscillation of the band gap leads to the periodic metal-semiconductor transitions [96,98,106,107], examples of which are illustrated in figure 13. It is worth mentioning that the band gap of a SWNT also undergoes periodic oscillation with a magnetic field applied along the tube axis, due to the change in effective chirality from the presence of Aharonov-Bohm phase [95,97].…”

Section: Effects Of Mechanical Strain On Band Gapmentioning

confidence: 99%

Torsional electromechanical systems based on carbon nanotubes

Paulson

Cui

et al. 2012

Rep. Prog. Phys.

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Carbon nanotubes (CNTs) are among the most highly studied nanomaterials due to their unique (and intertwined) mechanical and electrical properties. Recent advances in fabrication have allowed devices to be fabricated that are capable of applying a twisting force to individual CNTs while measuring mechanical and electrical response. Here, we review major results from this emerging field of study, revealing new properties of the material itself and opening possibilities for advances in future devices.

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Section: Effects Of Mechanical Strain On Band Gapmentioning

confidence: 99%

Torsional electromechanical systems based on carbon nanotubes

Paulson

Cui

et al. 2012

Rep. Prog. Phys.

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“…There have been a few predictions on the electronic structure evolution of SWCNT subjected to radial deformations, [28,29,30,31,32,33,34,35]: they basically show that both metal-semiconductor and semiconductor-metal transitions are possible, depending on the tube chirality and on the degree of deformation. There have been some experimental confirmations of both a semiconductor to metal transition in SWCNT [36] and of a metalsemiconductor transition in DWCNT [37] upon radial collapse.…”

Section: Introductionmentioning

confidence: 99%

Radial collapse of carbon nanotubes for conductivity optimized polymer composites

Balima

Floch

Adessi

et al. 2016

Carbon

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The optimization of the electronic conduction of carbon nanotube polymer composites is studied by tuning the radial geometry of the carbon nanotubes in a compression cycle. We have investigated the structural evolution of multi-walled carbon nanotubes in a polyamide matrix as a function of applied high pressure. Combining high resolution electron microscopy and small angle neutron scattering experiments, we conclude that the nanotube radial cross-section is irreversibly deformed following applied pressures up to 5 GPa. Studying highly percolated composites we observe that the sample resistivity drastically decreases with pressure up to about 2 GPa with no further change up to the maximum 5 GPa applied pressure. An important hysteresis is observed upon decompression which leads to an enhanced electrical con

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“…10,11 On the other hand, theoretical calculations show that the chirality has only a small effect on the collapse pressure P c , which is mainly determined, for single-walled tubes, by the tube diameter 5,8,9 (given as P c B 1/d 3 , where d is the diameter of the tube). Furthermore, the electronic structure of CNTs is strongly dependent not only on their chirality but also on the modification of their radial cross-section geometry, [12][13][14][15][16][17][18][19] which can be affected by external forces like van der Waals interactions with a surface 20,21 or hybridization with an interface. 22 In this article we deal with the collapse process of CNTs, which encapsulate a molecular ''foreign material''.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured water and carbon dioxide inside collapsing carbon nanotubes at high pressure

Cui

Cerqueira

Botti

et al. 2016

Phys. Chem. Chem. Phys.

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We present simulations of the collapse under hydrostatic pressure of carbon nanotubes containing either water or carbon dioxide. We show that the molecules inside the tube alter the dynamics of the collapse process, providing either mechanical support and increasing the collapse pressure, or reducing mechanical stability. At the same time the nanotube acts as a nanoanvil, and the confinement leads to the nanostructuring of the molecules inside the collapsed tube. In this way, depending on the pressure and on the concentration of water or carbon dioxide inside the nanotube, we observe the formation of 1D molecular chains, 2D nanoribbons, and even molecular single and multi-walled nanotubes. The structure of the encapsulated molecules correlates with the mechanical response of the nanotube, opening up opportunities for the development of new devices or composite materials. Our analysis is quite general and it can be extended to other molecules in carbon nanotube nanoanvils, providing a strategy to obtain a variety of nano-objects with controlled features.

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Metal–semiconductor transitions under uniaxial stress for single- and double-walled carbon nanotubes

Cited by 19 publications

References 33 publications

Torsional electromechanical systems based on carbon nanotubes

Torsional electromechanical systems based on carbon nanotubes

Radial collapse of carbon nanotubes for conductivity optimized polymer composites

Nanostructured water and carbon dioxide inside collapsing carbon nanotubes at high pressure

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