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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 02, 2015
- Source ID
- 10.1063/1.4907608
Entities
People
- Brian Wardle
- Diana J Lewis
- Itai Y. Stein
- Jeonyoon Lee
- Mackenzie E. Devoe
- Noa Lachman
- Samuel T. Buschhorn
- Seth S. Kessler
Organizations
- Army Research Office
- Massachusetts Institute of Technology
- United States Department of Defense