Abstract: The fabrication and structure characterization of a new kind of self-assemble film, molecular deposition (MD) film, were reported.According to the salt-forming reaction of organic or inorganic anionic and cationic compounds, an ordered layer structure ultrathin film was formed by alternative deposition of anionic polyelectrolyte (or bipolar) and cationic polyelectrolyte (or bipolar).MDis a novel technique for fabrication of organic ultrathin film, and also is a self-assemble ultrathin ordered film.

Key words: Self assemble film, Molecular deposition (MD) film, Anionic polyelectrolyte, Bipolar quaternary ammonium salt