Abstract: The assemblies of the C₆₀ mixed film and the behenic acid (BA) film were made successfully by means of Langmuir-Blodgett (LB) technique with BA, arachic acid (AA), stearic acid (SA) and octadecanyl amine (OA) as the assistant material, and the reorganization of the LB films was directly observed by liquid atomic force microscopy (AFM). The AFM data show that the C₆₀ mixed film and the BA film were all reorganized in water with the uniform size of C₆₀ aggregates, and the weaker reorganization was observed for the former. It is considered that the Cd²⁺ in water decreased the interaction resulted in the reorganization of alkyl chains between headgroups and the mica substrate. Owing to the reaction of the acid and alkali, the C₆₀ mixed film got weaker reorganization in water compared with the cadmium behenic films.

Key words: BA and C₆₀ composite LB films, reorganization, atomic force microscopy