We have established a procedure to obtain clean pristine or functionalized nanotubes. The combination of several chemical cleaning processes (acids and oxidants), heating treatments with sonications allows to obtain clean carbon nanotubes. Later, they can be separated regarding their diameter (and consequently, quirality) using density-gradient ultracentrifugation.
We have already theoretically studied the magnetic properties of paramagnetic transition metal centers coordinated with nanotubes as bridging ligands (Nano Lett. 2006, 6, 380). The presence of the nanotubes results in relatively strong exchange coupling interaction between the paramagnetic centers due to the extended pi system of the nanotubes. The first aim of the project is to synthesize and to characterize the magnetic properties and the structure of such systems. For such purpose, we are employing fluorescence and Raman techniques together with microscopic tools among others, the use of free-aberration transmission electron microscope that allows to resolve at atomic level the structure of molecular complexes.These techniques will be also employed in the second goal of this project, the characterization of the nanotubes decorated with transition or rare earth metal complexes together with the measure of their single-molecule conductance and fluorescence properties. Theoretical tools have been employed to analyzed to changes in the spectroscopic data due to the interactions between molecules and nanotubes.
G. Magadur, J.-S. Lauret, G. Charron, F. Bouanis, E. Norman, V. Huc, C.-S. Cojocaru, S. Gómez-Coca, E. Ruiz, T. Mallah, "Charge Transfer and Tunable Ambipolar Effect Induced by Assembly of Cu(II) Binuclear Complexes on Carbon Nanotube Field Effect Transistor Devices", J. Am. Chem. Soc.2012, 134, 7896-7901.
E. Ruiz, F. Nunzi and S. Alvarez, "Magnetic communication through functionalized nanotubes: A theoretical study", Nano Letters2006, 6, 380-384.