J-Aggregation Characteristics of Merocyanine Dye with Arachidic Acid LB Films by Heat Treatment

Abstract

For a measurement of J-aggregation characteristics by heat treatment, we fabricated arachidic acid (AA)-Merocyanine dye mixed Langmuir-Blodgett (LB) films. pi-A curves were used to investigate the surface pressure of the LB film from a liquid to a solid state while the pressure ranged from 35 and 40 mN/m. When the surface pressure reached 40 mN/m, a monolayer was deposited onto the hydrophilic glass substrates by Y-type deposition. For the UV spectrum observation, a multi layer film was deposited. A narrowing of the red-shifted band was observed. We studied the effect of heat treatments at temperatures below 60 degrees C by observing the UV spectra of merocyanine dye (MD). The J-aggregation was centered at 550-590 nm at 20 degrees C-25 degrees C. We will study the system before and after the application of heat treatment J-aggregation. The J-aggregation will be thermally induced in the mixed LB films by heat treatments at various temperatures. We expect that after heat treatment, the spectral shape and peak of the band will be altered. We investigated that morphology of MD using STM. Also I-V curve was decreased as increasing temperatures.