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

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

2007-12-11

arxiv.org/abs/0712.1733v3

Physical Review B 77, 075418 (2008)

Physics

Condensed Matter

Materials Science

7 pages and 6 figures

Scientific paper

10.1103/PhysRevB.77.075418

We present measurements of the frequency and electric field dependent conductivity of single walled carbon 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 $\omega_0$ which varies over seven decades with a range of film thickness from sub-monolayer to 200 nm. The nonlinear electric field-dependent DC conductivity shows strong dependence on film thickness as well. Measurement of the electric field dependence of the resistance R(E) allows for the determination of a length scale $L_{E}$ possibly characterizing the distance between tube contacts, which is found to systematically decrease with increasing film thickness. The onset frequency $\omega_0$ of ac conductivity and the length scale $L_{E}$ 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.

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