Contact resistance between carbon nanotubes

Buldum, Alper; Lu, Jianping

doi:10.1103/physrevb.63.161403

Cited by 245 publications

(199 citation statements)

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“…12 The resistivity changes can be caused by percolation or tunneling effects that could easily reduce the contact resistance between grains. 36,37 Both phenomena can cause conduction of electrons by hopping from one grain to a neighboring one when the interparticle distance between grains is only few nanometers, a situation that can be easily achieved by putting the sample under a pressure of several gigapascals. Additionally, the reported resistivity experiments 12 could have been affected by the experimental method: two contact resistivity measurements 38 and no use of PTM.…”

Section: A Sample Characterizationmentioning

confidence: 99%

Cobalt ferrite nanoparticles under high pressure

Saccone

Ferrari

Errandonea

et al. 2015

Journal of Applied Physics

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Articles you may be interested inMicrostructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method J. Appl. Phys. 117, 17A328 (2015) We report by the first time a high pressure X-ray diffraction and Raman spectroscopy study of cobalt ferrite (CoFe 2 O 4 ) nanoparticles carried out at room temperature up to 17 GPa. In contrast with previous studies of nanoparticles, which proposed the transition pressure to be reduced from 20-27 GPa to 7.5-12.5 GPa (depending on particle size), we found that cobalt ferrite nanoparticles remain in the spinel structure up to the highest pressure covered by our experiments. In addition, we report the pressure dependence of the unit-cell parameter and Raman modes of the studied sample. We found that under quasi-hydrostatic conditions, the bulk modulus of the nanoparticles (B 0 ¼ 204 GPa) is considerably larger than the value previously reported for bulk CoFe 2 O 4 (B 0 ¼ 172 GPa). In addition, when the pressure medium becomes non-hydrostatic and deviatoric stresses affect the experiments, there is a noticeable decrease of the compressibility of the studied sample (B 0 ¼ 284 GPa). After decompression, the cobalt ferrite lattice parameter does not revert to its initial value, evidencing a unit cell contraction after pressure was removed. Finally, Raman spectroscopy provides information on the pressure dependence of all Raman-active modes and evidences that cation inversion is enhanced by pressure under non-hydrostatic conditions, being this effect not fully reversible. V C 2015 AIP Publishing LLC. [http://dx

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Section: A Sample Characterizationmentioning

confidence: 99%

Cobalt ferrite nanoparticles under high pressure

Saccone

Ferrari

Errandonea

et al. 2015

Journal of Applied Physics

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“…For instance, the relaxation of a CNT-CNT junction in-registry changes the resistance only quantitatively rather than qualitatively. 23 The results for the relaxed structures reveal that, at the Fermi energy, the pentagon configuration ͑5͒ has a transmission lower by about three orders of magnitude than configuration ͑4͒. This fact could be exploited in an electronic switching device on the nanoscale, as manipulation of fullerenes by using STM or atomic force microscope tips is becoming a standard technique in the field.…”

mentioning

confidence: 98%

“…22 Similar effects have been studied theoretically for a junction of two CNTs in a -electron tight-binding formulation. 23 In this paper, we propose an alternative switching device entirely on the nanoscale which combines the unique features of both C 60 and CNTs, in a CNT-C 60 -CNT hybrid system ͑see Fig. 1͒.…”

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confidence: 99%

Theory of an all-carbon molecular switch

et al. 2002

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We study electron transport across a carbon molecular junction consisting of a C 60 molecule sandwiched between two semi-infinite metallic carbon nanotubes. It is shown that the Landauer conductance of this carbon hybrid system can be tuned within orders of magnitude not only by varying the tube-C 60 distance, but more importantly at fixed distances by ͑i͒ changing the orientation of the Buckminsterfullerene or ͑ii͒ rotating one of the tubes around its cylinder axis. Furthermore, it is explicitly shown that structural relaxation determines qualitatively the transmission spectrum of such devices.

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“…The disparity in electrical conductivity (σ) of metallic CNTs and polymer is can be almost 20 orders of magnitude with, 10 6 Sm -1 for CNTs [19] compared to 10 -13 Sm -1 for regular insulating polymers [20]. Given that even for a percolating CNT network the electrical conductivity can be somewhat limited by CNT-CNT contact resistance [3, 21,22], we chose a CNT:polymer conductivity ratio of 10 10 . Since the morphology constantly evolves during simulation, a time average of representative configurations over long simulation runs (200000 steps or more) was used to generate the in-plane conductivity of the slab.…”

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confidence: 99%

Conductivity of carbon nanotube polymer composites

Wescott¹,

Kung²,

Maiti

2007

Applied Physics Letters

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Dissipative particle dynamics simulations were used to investigate methods of controlling the assembly of percolating networks of carbon nanotubes (CNTs) in thin films of block copolymer melts. For suitably chosen polymers the CNTs were found to spontaneously self-assemble into topologically interesting patterns. The mesoscale morphology was projected onto a finite-element grid and the electrical conductivity of the films computed. The conductivity displayed nonmonotonic behavior as a function of relative polymer fractions in the melt. Results are compared and contrasted with CNT dispersion in small-molecule fluids and mixtures.

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Contact resistance between carbon nanotubes

Cited by 245 publications

References 30 publications

Cobalt ferrite nanoparticles under high pressure

Cobalt ferrite nanoparticles under high pressure

Theory of an all-carbon molecular switch

Conductivity of carbon nanotube polymer composites

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