The suspension-based preparation of conjugated polymer film can generate a nanostructured conjugated film. A simple technique, injecting polymer solution into non-solvent, is applicable for many soluble conjugated polymers. The collection of colloidal particles in suspensions can be done by electrophoretic deposition. In comparison with traditional spin-coating technique, in which most of material used is blown out, the polymers can be efficiently collected. Two types of applications of this technique, polymer light-emitting devices as artificial finger print devices and preparation of conjugated polymer-fullerene nanocomposites, are mentioned. (c) 2005 Elsevier B.V. All rights reserved.