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Temperature-dependent Conductance in Carbon Nanotube Networks

ORAL

Abstract

We report a comprehensive experimental and theoretical study on the temperature-dependence of conductance in carbon nanotube networks (CNTNs). Our experimental results demonstrate up to four orders of magnitude change with temperature in electrical conductance. Some of the data can be accounted by the variable range hopping (VRH) mechanism. In particular, we report an analytical formula for the localization length as a function of the Fermi energy and CNT bandstructure, which explains the different families of the observed behavior. The localization length in the zero-gap armchair (6,6) CNT, the localization length is much longer than in other single chirality CNTs. To explain conductance temperature dependence in (6,6) tube, we employ a full-band model within the perturbation theory to account for the phonon-assisted tunneling conductance across the CNTs. The theoretical study shows that while corresponding purely electronic conductance is not-negligible, it does not depend on temperature. On the other hand, phonon-assistant tunneling accounts for the observed temperature dependence in (6,6) CNTNs sample.

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Presenters

  • Davoud Adinehloo

    Electrical Engineering, State University of New York at Buffalo, Department of Electrical Engineering, University at Buffalo

Authors

  • Davoud Adinehloo

    Electrical Engineering, State University of New York at Buffalo, Department of Electrical Engineering, University at Buffalo

  • Weilu Gao

    Electrical and Computer Engineering, University of Utah, Department of Electrical and Computer Engineering, The University of Utah

  • Ali Mojibpour

    Electrical and Computer Engineering, Rice University, Department of Electrical and Computer Engineering, Rice Univ

  • Junichiro Kono

    Electrical and Computer Engineering, Rice University, Department of Electrical and Computer Engineering, Rice Univ, Rice University, Rice Univ, Department of Electrical and Computer Engineering, Rice University, Department of Physics and Astronomy, Rice University

  • Vasili Perebeinos

    State Univ of NY - Buffalo, EE, State Univ of NY - Buffalo, Electrical Engineering, State University of New York at Buffalo, Department of Electrical Engineering, University at Buffalo, University at Buffalo, Department of Electrical Engineering, State Univ of NY - Buffalo