Effects of Complex on Electrical Properties of LB Films Using Dendritic Macromolecules

One of the most peculiar characteristics of dendritic macromolecules is their controlled molecular structure and orientation, which means that they have a practical application in achieving a highly organized molecular arrangement. We attempted to fabricate the G4-48PyP dendrimer Langmuir-Blodgett (LB) films containing 48 pyridinepropanol functional end group that could form a complex structure with metal ions. Also, we have investigated the surface activity at the air-water interface as well as the electrical properties for the monolayers of pure G4-48PyP dendrimer and its complex with Fe 2+ ions. The electrical properties of the ultra-thin dendrimer LB films were investigated by studying the current-voltage characteristics of metal/dendrimer LB films/metal (MIM) structure. The calculated conductivity σ values and barrier height Φ b values of pure G4-48PyP dendrimer and its complexes with Fe 2+ ions are 9.56×10 -16 and 1.46×10 -14 S/cm, 1.18 and 1.10 eV, respectively. As a result, the metal ion around G4-48PyP dendrimer can contribute to the formation of network structure among dendrimers and the change of electrical properties.