Electrical Transport in Carbon Nanotubes with Chirality Changes

We present electrical transport measurements of individual single-wall carbon nanotubes in which the chiral indices (n,m) are not fixed along the nanotube length.~ The nanotube structures are first probed by Rayleigh scattering spectroscopy, after which the tube is transferred to a substrate by a mechanical transfer process.~ Electrical leads are then fabricated by e-beam lithography.~ The transport behavior is measured in various sections of the tube to probe the behavior of the molecular junctions.