A nanocomposite of multi-walled carbon nanotubes (MWNTs) embedded ha poly(ortho-anisidine) (POAS) and pure POAS were synthesised by oxidative polymerisation. Langmuir-Schaefer (LS) films were fabricated at air-liquid interface. The in situ doping process was performed during the film deposition itself by spreading chloroform solutions of the materials onto 1 M HCL The specific conductivity of both the nanocomposite (POAS-MWNTs) and pure POAS was investigated to verify the effective enhancement provided by the insertion of MWNTs inside the polymeric matrix. The morphology of POAS-MWNTs nanocomposite films was investigated by atomic force microscopy. Evident relationship between the film morphology and its conducting properties was revealed. (C) 2004 Elsevier B.V. All rights reserved.