Morphological Observations Of Cyanine Dye J-aggregates At A Solid/Air Interface By Fluorescence Microscopy And Atomic Force Microscopy

J-aggregates are specific supramolecular assemblies discovered by Jelly and Scheibe, which are characterized by a sharp, intensive absorption band with a bathochromic shift compared to a monomer band. In this thesis, we investigated a pseudoisocyanine dye (PIC-Br) J-aggregates at a mica / air interface prepared by vertical spin-coating method. For the first time, we observed the transformation of the J-aggregates morphologies depending on the surrounding humidity by fluorescence microscopy and atomic force microscopy. At high humidity, large broken leaf-like islands were observed. With a decrease in humidity, the size of the islands became smaller. Furthermore, microcrystalline J-aggregates were observed under dried condition. These morphological transformation were concluded to be caused by lateral diffusion of PIC molecules on the mica surface.This thesis is organized into seven main parts:1. Introduction2. Experimental3. Results4. Discussion5. Conclusion6. Future Plans7. Appendix...