Formation of ultra-thin organic films by micelle-wrapping sequential adsorption method

Layer-by-layer sequential adsorption process of polyelectrolytes had conven tionally been used for the fabrication of the ultra-thin organic film forme d by various polymers with different polarity of charge. In this study, hyd rophobic Ruthenium complex monomer (tris (bilyridyl) ruthenium (II) hexaflu orophosphate) was micelle-wrapped with an anionic surfactant, sodium dodecy lbenzenesulfonate, and was assembled with PAH (poly (allylamine hydrochlori de)) which has the opposite charge on ITO substrates. With this method, we succeed in Fabricating ultra-thin organic films even when the adsorption ma terial is not polymer but monomer. Moreover it was found that the bilayer t hickness of the self-assembled (Ru micelle/PAH) was systematically changed by adjusting the solution pH of each bath. By using this process, EL device was fabricated by depositing the thin film of micelle-wrapping ruthenium c omplex monomer on ITO and formed Bi electrode on top of the film. Light emi ssion was observed by applying voltage to this device.