Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks

Jeonyoon Lee; Itai Y. Stein; Mackenzie E. Devoe; Diana J. Lewis; Noa Lachman; Seth S. Kessler; Samuel T. Buschhorn; Brian L. Wardle

doi:https://doi.org/10.1063/1.4907608

Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks

Jeonyoon Lee, Itai Y. Stein, Mackenzie E. Devoe, Diana J. Lewis, Noa Lachman, Seth S. Kessler, Samuel T. Buschhorn, Brian L. Wardle

Research output: Contribution to journal › Article › peer-review

Abstract

Here, we quantify the electron transport properties of aligned carbon nanotube (CNT) networks as a function of the CNT length, where the electrical conductivities may be tuned by up to 10× with anisotropies exceeding 40%. Testing at elevated temperatures demonstrates that the aligned CNT networks have a negative temperature coefficient of resistance, and application of the fluctuation induced tunneling model leads to an activation energy of ≈14 meV for electron tunneling at the CNT-CNT junctions. Since the tunneling activation energy is shown to be independent of both CNT length and orientation, the variation in electron transport is attributed to the number of CNT-CNT junctions an electron must tunnel through during its percolated path, which is proportional to the morphology of the aligned CNT network.

Original language	English
Article number	053110
Journal	Applied Physics Letters
Volume	106
Issue number	5
DOIs	https://doi.org/10.1063/1.4907608
State	Published - 2 Feb 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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https://doi.org/10.1063/1.4907608

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title = "Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks",

abstract = "Here, we quantify the electron transport properties of aligned carbon nanotube (CNT) networks as a function of the CNT length, where the electrical conductivities may be tuned by up to 10× with anisotropies exceeding 40%. Testing at elevated temperatures demonstrates that the aligned CNT networks have a negative temperature coefficient of resistance, and application of the fluctuation induced tunneling model leads to an activation energy of ≈14 meV for electron tunneling at the CNT-CNT junctions. Since the tunneling activation energy is shown to be independent of both CNT length and orientation, the variation in electron transport is attributed to the number of CNT-CNT junctions an electron must tunnel through during its percolated path, which is proportional to the morphology of the aligned CNT network.",

author = "Jeonyoon Lee and Stein, {Itai Y.} and Devoe, {Mackenzie E.} and Lewis, {Diana J.} and Noa Lachman and Kessler, {Seth S.} and Buschhorn, {Samuel T.} and Wardle, {Brian L.}",

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doi = "https://doi.org/10.1063/1.4907608",

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T1 - Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks

AU - Lee, Jeonyoon

AU - Stein, Itai Y.

AU - Devoe, Mackenzie E.

AU - Lewis, Diana J.

AU - Lachman, Noa

AU - Kessler, Seth S.

AU - Buschhorn, Samuel T.

AU - Wardle, Brian L.

PY - 2015/2/2

Y1 - 2015/2/2

N2 - Here, we quantify the electron transport properties of aligned carbon nanotube (CNT) networks as a function of the CNT length, where the electrical conductivities may be tuned by up to 10× with anisotropies exceeding 40%. Testing at elevated temperatures demonstrates that the aligned CNT networks have a negative temperature coefficient of resistance, and application of the fluctuation induced tunneling model leads to an activation energy of ≈14 meV for electron tunneling at the CNT-CNT junctions. Since the tunneling activation energy is shown to be independent of both CNT length and orientation, the variation in electron transport is attributed to the number of CNT-CNT junctions an electron must tunnel through during its percolated path, which is proportional to the morphology of the aligned CNT network.

AB - Here, we quantify the electron transport properties of aligned carbon nanotube (CNT) networks as a function of the CNT length, where the electrical conductivities may be tuned by up to 10× with anisotropies exceeding 40%. Testing at elevated temperatures demonstrates that the aligned CNT networks have a negative temperature coefficient of resistance, and application of the fluctuation induced tunneling model leads to an activation energy of ≈14 meV for electron tunneling at the CNT-CNT junctions. Since the tunneling activation energy is shown to be independent of both CNT length and orientation, the variation in electron transport is attributed to the number of CNT-CNT junctions an electron must tunnel through during its percolated path, which is proportional to the morphology of the aligned CNT network.

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DO - https://doi.org/10.1063/1.4907608

M3 - مقالة

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JO - Applied Physics Letters

JF - Applied Physics Letters

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Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks

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