The present study reports thin films of merocyanine 540-octadecylamine (MC540-ODA) prepared by Langmuir-Blodgett (LB) and Spin-Coating (SC) methods, and their photophysical and morphological features. The addressed MC540-ODA LB films are different from the others designed by co-spreading method. Briefly, a known quantity of ODA in chloroform was slowly spread on the surface of a 10(-6) M concentrated solution of MC540 in deionized water as subphase and the LB films were generated by the deposition of a MC540-ODA Langmuir film onto a solid substrate. The capability of MC540-ODA forming a stable monolayer at the air-water interface was confirmed by pressure-area (pi-A) isotherm studies. The spectroscopic studies revealed that the photophysical properties of LB films strongly depended on the number of layers and deposition pressure. The SC thin films of MC540 at a constant dye concentration with and without ODA were successfully fabricated under the optimized experimental conditions. In the SC thin films, ODA molecules played a crucial role in their photophysical and morphological variations. Consequently, the varied experimental route allows to fine-tune the photophysical and morphological properties of the dye thin films. (C) 2019 Published by Elsevier B.V.
