Determination of the Intershell Conductance in Multiwalled Carbon Nanotubes

Bourlon, B.; Mikó, C.; Forró, Lászlø; Glattli, Christian; Bachtold, Adrian

doi:10.1103/physrevlett.93.176806

Cited by 203 publications

(172 citation statements)

References 27 publications

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“…In multiwalled nanotubes (MWNT) current flows only through the outermost shell as the inner shells are not electronically coupled to the metal leads [13], and inter shell hopping is negligible [22]. Here, we are interested in the role of electrostatic coupling between the inner and outer shells, in affecting the potential profile and current carried by the outer shell.…”

Section: Electrostatic Gating Due To Inner Shellsmentioning

confidence: 99%

“…Another source of error is an overestimated bandgap [Eq. (22)] and higher threshold for the onset of current due to non crossing subbands. In this work, all our self-consistent calculations included Eq.…”

Section: Formalismmentioning

confidence: 99%

“…Tunneling current by non crossing subbands has a lower threshold bias [Eq. (22)] and depends exponentially on the slope of the potential near the edges of the tube. Therefore, a self-consistent solution for the shape of tunneling barrier is must for large diameter nanotubes at all biases.…”

Section: Formalismmentioning

confidence: 99%

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Effect of scattering and contacts on current and electrostatics in carbon nanotubes

2005

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We computationally study the electrostatic potential profile and current carrying capacity of carbon nanotubes as a function of length and diameter. Our study is based on solving the non equilibrium Green's function and Poisson equations self-consistently, including the effect of electronphonon scattering. A transition from ballistic to diffusive regime of electron transport with increase of applied bias is manifested by qualitative changes in potential profiles, differential conductance and electric field in a nanotube. In the low bias ballistic limit, most of the applied voltage drop occurs near the contacts. In addition, the electric field at the tube center increases proportionally with diameter. In contrast, at high biases, most of the applied voltage drops across the nanotube, and the electric field at the tube center decreases with increase in diameter. We find that the differential conductance can increase or decrease with bias as a result of an interplay of nanotube length, diameter and a quality factor of the contacts. From an application view point, we find that the current carrying capacity of nanotubes increases with increase in diameter. Finally, we investigate the role of inner tubes in affecting the current carried by the outermost tube of a multiwalled nanotube.

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Section: Electrostatic Gating Due To Inner Shellsmentioning

confidence: 99%

Section: Formalismmentioning

confidence: 99%

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Effect of scattering and contacts on current and electrostatics in carbon nanotubes

2005

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“…But recent results reveal a substantial contribution of conduction from the second wall after carriers tunnel from the outermost wall [4]. A perfect electrical contact with an MWCNT can be achieved by preparing the contact electrodes during the tube growth and this technique has shown that the conductivity of MWCNT can be several hundred times higher than that of SWCNT [5].…”

Section: Introductionmentioning

confidence: 99%

Controlling the resistivity of multi-walled carbon nanotube networks by copper encapsulation

2011

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The resistivity of multi-walled carbon nanotube networks can be changed by filling Cu into the nanotubes as well as by preparing the nanotube networks with various densities. The resistivity can be controlled to be lower than the c-axis resistivity of graphite, and has a low temperature coefficient of 1.12 10 /K over the temperature range of 20~500 K.Filling Cu into the nanotubes decreases the intra-tube resistivity, but the temperature coefficient of the resistivity is governed by the inter-tube resistivity of the nanotube network.

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“…Historically, contributions of inter-shell and intra-shell conductivity are of great concern. 4 Several groups observed that the current mainly flowed on the outermost shell, [5][6][7] but some groups claimed that the inner shells also contributed to the MWCNT conduction. [8][9][10] The intra-shell conduction is similar to the high conductance of a graphene sheet through π-orbital channels.…”

Section: Introductionmentioning

confidence: 99%

Electric current distribution of a multiwall carbon nanotube

Chen

Chang

2016

AIP Advances

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The electric current distribution in a multiwall carbon nanotube (MWCNT) was studied by in situ measuring the electric potential along an individual MWCNT in the ultra-high vacuum transmission electron microscope (TEM). The current induced voltage drop along each section of a side-bonded MWCNT was measured by a potentiometric probe in TEM. We have quantitatively derived that the current on the outermost shell depends on the applied current and the shell diameter. More proportion of the total electronic carriers hop into the inner shells when the applied current is increased. The larger a MWCNT’s diameter is, the easier the electronic carriers can hop into the inner shells. We observed that, for an 8 nm MWCNT with 10 μA current applied, 99% of the total current was distributed on the outer two shells.

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Determination of the Intershell Conductance in Multiwalled Carbon Nanotubes

Cited by 203 publications

References 27 publications

Effect of scattering and contacts on current and electrostatics in carbon nanotubes

Effect of scattering and contacts on current and electrostatics in carbon nanotubes

Controlling the resistivity of multi-walled carbon nanotube networks by copper encapsulation

Electric current distribution of a multiwall carbon nanotube

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