Simulating percolating behavior of conductive particles in anisotropically conductive composite films |
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Authors: | SY Lu CY Lin |
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Institution: | (1) National Tsing-Hua University, Department of Chemical Engineering, Hsin-Chu, Taiwan 30043, Republic of China, CN |
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Abstract: | A numerical scheme is developed to simulate the percolating behavior of conductive particles within a non-conductive matrix
film with a preferential alignment of particles achieved via externally imposed deterministic driving forces. The sharp transition
from non-conducting to conducting of the composite film is successfully revealed with the model. The percolation behavior
is studied in terms of four percolation parameters, including the percolation probability, the normalized shortest percolation
path, normalized gyration radius and density of the percolation cluster, subject to variation in five important system parameters.
These include particle concentration, relative importance of the externally applied force, film thickness, film width and
particle size. The threshold particle concentration can be reduced by increasing the strength of the deterministic driving
force, decreasing film thickness, increasing film width or using smaller size particles. Our study suggests that using stronger
applied force for wider and thinner films containing smaller particles may be a good practice to obtain anisotropically conductive
films with a light particle loading that possess good conduction capability in the thickness direction and good insulation
in the planar direction.
Received: 19 February 2001 / Accepted: 30 May 2001 / Published online: 30 August 2001 |
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Keywords: | PACS: 61 43 B 81 05 N 72 80 T |
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