Impact of carbon nanotube length on electron transport in aligned carbon nanotube networks
Author(s)Lee, Jeonyoon; Stein, Itai Y.; Devoe, Mackenzie E.; Lewis, Diana Jean; Lachman-Senesh, Noa; Buschhorn, Samuel T.; Wardle, Brian L.; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Aeronautics and Astronautics; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering
Applied Physics Letters
American Institute of Physics (AIP)
Lee, Jeonyoon, Itai Y. Stein, Mackenzie E. Devoe, Diana J. Lewis, Noa Lachman, Seth S. Kessler, Samuel T. Buschhorn, and Brian L. Wardle. “Impact of Carbon Nanotube Length on Electron Transport in Aligned Carbon Nanotube Networks.” Appl. Phys. Lett. 106, no. 5 (February 2, 2015): 053110.
Author's final manuscript