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Coupled study by TEM/EELS and STM/STS of electronic properties of Cand CNx-nanotubes

Hong Lin, Jérôme Lagoute, Vincent Repain, Cyril Chacon, Yann Girard, Jean-Sébastien Lauret, Raul Arenal, François Ducastelle, Sylvie Rousset, Annick Loiseau, Compte rendus Physique 12, 909 (2011)

Carbon nanotubes are the focus of considerable research efforts due to their fascinating physical properties. They provide an excellent model system for the study of onedimensional materials and molecular electronics. The chirality of nanotubes can lead to very different electronic behaviour, either metallic or semiconducting. Their electronic spectrum consists of a series of Van Hove singularities defining a bandgap for semiconducting tubes and molecular orbitals at the corresponding energies. A promising way to tune the nanotubes electronic properties for future applications is to use doping by heteroatoms. Here we report on the experimental investigation of the role of many-body interactions in nanotube bandgaps, the visualization in direct space of the molecular orbitals of nanotubes and the properties of nitrogen doped nanotubes using scanning tunneling microscopy and transmission electron microscopy as well as electron energy loss spectroscopy.

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