Fabrication and electrical properties of dendritic macromolecule thin films based on metal complexes

Abstract

We attempted to fabricate the dendrimer LB films containing a 48 pyridylpropoxy end functional group. The pyridylpropoxy functional group could form a complex structure with metal ions. The samples for electrical properties were fabricated in two ways using metal ions complex by the LB method. In addition, we have investigated the surface activity at the air–water interface as well as the electrical properties for the monolayers LB films of pure G4-48PyP dendrimer and its complex with metal ions (Pt 4+ and Fe 2+ ions). In the π– A isotherms of the dendrimers, the stable condensed films formed at the air–water interface and the effect of metal ions showed a difference in molecular behavior. And we have investigated the electrical properties of the ultra-thin dendrimer LB films by the I– V characteristics of metal/insulator/metal structure. There is a difference between pure G4-48PyP dendrimer LB film and its complex metal ions. This has been generated by the metal ions’ effect. We think that these differences occur by the build up of multi-layers by complex process in the flask and concentration of metal ions in subphase. Therefore, the metal ion around G4-48PyP dendrimer can contribute to the formation of network structure among dendrimers and this result affects the change in electrical properties.