Fabrication Of Functionalized Ultra-thin Multilayer Film Via Stepwise Self-assembly

Layer-by-layer(LbL) self-assembly has attracted more and more attention of scientists working on supramolecules in recent years. It has been widely studied duo to its speed, convenience, and controllable structures. Although many methods on fabricating functionalized multilayer films have been established, it still remains challenge on how to controllably introduce abundant single charged functional molecules into multilayer systems.In this dissertation we mainly focus on a new method, so-called "stepwise self-assembly", by which we can introduce single charged molecules into LbL multilayer systems. This method is described as follows: first, we mix single charged molecules as molecular templates with counter charged polyelectrolyte in aqueous solution to form precursor assemblies; second, we deposit these precursor assemblies alternatively with another counter charged polyelectrolyte at solid/liquid interface to fabricate LbL multilayer film. The single charged molecules can be introduced into LbL multilayer through this method abundantly and controllably.In charpter 1, we focused on how to fabricate LbL multilayer films with stepwise self-assembly. During the fabrication of LbL mutilayer film, we found template molecules were nearly desorbed completely from the film when adsorbing the counter charged polyelectrolyte. Through detailed study, we confirmed that both ionic strength in solution and adsorption of polyelectrolye on film surface were important factors which affected the releasing behavior of template molecules from the film. Among these two factors ionic strength in...