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(a) Schematic representation of a silver nanoparticle film. (b) Upon application of an applied bias voltage, the nanoparticles, coated in PVP (shown in orange), are interconnected by sets of conductive filaments which form along the direction of current flow due to electromigration. (c) Several filaments may exist at the junction between two particles and can be broken or thickened as current continues to flow through the film.
