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Frequency-and electric-field-dependent conductivity of single-walled carbon nanotube networks of varying density
 

Summary: Frequency- and electric-field-dependent conductivity of single-walled carbon nanotube
networks of varying density
Hua Xu,* Shixong Zhang, and Steven M. Anlage
Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park,
Maryland 20742-4111, USA
Liangbing Hu and George Grüner
Department of Physics, University of California, Los Angeles, California 90095, USA
Received 8 October 2007; published 20 February 2008
We present measurements of the frequency- and electric-field-dependent conductivity of single-walled car-
bon nanotube SWCNT networks of various densities. The ac conductivity as a function of frequency is
consistent with the extended pair approximation model and increases with frequency above an onset frequency
0 which varies over seven decades with a range of film thickness from submonolayer to 200 nm. The
nonlinear electric-field-dependent dc conductivity shows strong dependence on film thickness as well. Mea-
surement of the electric field dependence of the resistance R E allows for the determination of a length scale
LE possibly characterizing the distance between tube contacts, which is found to systematically decrease with
increasing film thickness. The onset frequency 0 of ac conductivity and the length scale LE of SWCNT
networks are found to be correlated, and a physically reasonable empirical formula relating them has been
proposed. Such studies will help the understanding of transport properties and benefit the applications of this
material system.
DOI: 10.1103/PhysRevB.77.075418 PACS number s : 73.63.Fg, 72.80.Ng

  

Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park
Gruner, George - Department of Physics and Astronomy, University of California at Los Angeles

 

Collections: Materials Science; Physics