08.06.2009. :: NanoLab seminar
Utorak 9. Jun 2009. u 11 casova
FIZICKI FAKULTET amfiteatar 661
Dr Vojislav Krstic
Trinity College, Dablin, Irska
"Impact of Phosphorous-Doping on Electrical and transport in Single-Walled Carbon Nanotubes"
Doping of single-walled carbon nanotubes is a powerful technological tool to tune their electronic properties and thus has a wide impact on many fields of nanotechnology. We report on the doping of single-walled carbon nanotubes by incorporation of phosphorous atoms into the nanotube honey-comb lattice by the arc-discharge method. The proof and the impact of phosphorous doping on the helicity and electronic properties of the single-walled carbon nanotubes is investigated by charge-transport, nuclear magnetic resonance and electron microscopy studies and underpinned by density-functional structural modelling. The phosphorous-doped nanotubes show a significant variation in tube
morphology compared to their undoped counterparts going along with a non-Luttinger liquid like behaviour of the zero-bias conductance with additional irregular step-like features. A decrease and an inversion of the nuclear-magnetic-resonance relaxation times are observed suggesting and enhanced spin-scattering. This observation can be linked to the step-like features through a one-dimensional spin-chain model.