We report the In-situ blends of polypyrrole/poly(3,4-ethylenedioxythiophene) synthesized as thin-films on glass substrates using the vapor-phase polymerization (VPP) technique. The blend ratios of PPy to 3,4-ethylenedioxythiopene were controlled by adjusting the amount of liquid-phase monomers placed in the VPP chamber. ATR-FTIR spectroscopy was used to examine the composition of blends. The electrical conductivity of the PPy/PEDOT coating increased from 4 S/cm for the pristine PPy to 58 S/cm in the case of an EDOT ratio of 1.0. Color and light transmittance changes were observed. The surface roughness values increased from 2.94 nm to 16.67 nm. (C) 2009 Elsevier B.V. All rights reserved.