[institut] Fw: NanoLabSeminar

[Institut za fiziku]

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From: "Mirzeta Savic" <mirzetas at ff.bg.ac.yu>
Date: June 5, 2009 8:49:36 AM GMT+02:00
Subject: Fw: NanoLabSeminar


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"

Abstract:

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.

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