The AC and DC conduction properties of Langmuir-Blodgett films
of fatty acids salts, deposited onto pre-treated substrates, have
been studied. Aluminum/LB film/Aluminum sandwich structures have
been constructed; the sample preparation procedure has been
optimized to minimize problems related to short circuits between
upper and lower electrodes by means of chemical and physical
treatments of the substrate surfaces. The results show that the
measured characteristics are related to the properties of the
films and are in good agreement with theoretical predictions.
Experimental data have been compared also with a theoretical
model, showing a good interpretation of the conduction mechanism.
Starting from these results, the behaviour of more attractive
materials has been investigated: conductive polymers (such as
polypirroles and polyanilines) and metalloproteins (such as redox
enzymes and cytochrome P450) have been studied in order to
highlight their capabilities to develop hybrid structures and
devices. In addition to the Langmuir-Blodgett technique, the
layer-by-layer surface modification was utilized for building up
multilayer structures. The multilayer formation was controlled by
UV-Visible and QCM techniques. Different types of structures and
their transport mechanism were proposed, towards the development
of nanomaterials and nanodevices.