  The supramolecular interaction between individual singlewall carbon nanotubes
and a functional organic material based on tetrathiafulvalene (TTF) is
investigated by means of electric transport measurements in field effect
transistor configuration as well as by NIR absorption spectroscopy. The results
clearly point to a charge transfer interaction in which the adsorbed molecule
serves as electron acceptor for the nanotubes through its pyrene units.
Exposure to iodine vapors enhances this effect. The comparison with pristine
carbon nanotube field effect transistor devices demonstrates the possibility to
exploit charge transfer interactions taking place in supramolecular assemblies
in which a mediator unit is used to transduce and enhance an external signal.
