Improving the Stability of Carbocyanine J-Aggregates in Layered Polymer Films

In the present report, the stability of TDBC J-aggregates in layered polymer films was studied using absorption and fluorescence spectroscopy. It was found, that the J-aggregates in pure films of polycation PDDA are very unstable. The additional deposition of another polymer like polyvinyl alcohol over the prepared films increases the stability at least 3 times. However, much better results were obtained by vacuum deposition of thin metallic films (20 nm gold and 3 nm titanium) over TDBC J-aggregates in PDDA films.