Influence of statistical distributions on the electrical properties of disordered and aligned carbon nanotube networks

摘要

We have studied the influence of different statistical distributions of various parameters describing the structural and physical properties of carbon nanotube (CNT) networks on their electrical properties. We observed a significant dependence on the distribution of structural parameters (length, diameter, and angle), but nearly no impact for a statistical distribution of the tube-tube resistance beyond percolation threshold. The variation of the conductance of the CNT network as a function of the CNT density observed experimentally can be accurately reproduced through simulations by considering a tube-tube resistance centered at 0.1-1.0 MΩ, in agreement with the experimental estimation. Since the number of tube-tube contacts is increasing rapidly with the size of the simulated network, a statistical representation of tube-tube resistances for large CNT network models does not introduce a significant variation.