Various techniques have been used to prepare polymer nanocomposite thin films that involve tedious work and consume considerable amount of materials and time. In this study, nanocomposite thin films of poly (3-hexylthiophene -2, 5-diyl) (P3HT), stearic acid and CdSe nanoparticles were fabricated by a stamping method which is a modification of Langmuir Schaefer technique. The CdSe nanoparticles were then grown in-situ between subsequent layers of thin film by gas exposure technique. Their surface-pressure (-A) isotherms and morphology were investigated. The surface-pressure isotherms revealed that, impurities in water subphase affect the profile of Langmuir monolayer. Stearic acid was found to be more dominant as compared to P3HT. The modified Langmuir Schaefer technique produced fairly smooth, large area nanocomposite thin films as shown by the AFM images. A prominent advantage of this procedure is that it requires only small amount of materials.