List of records in nano database
||Computer simulation of the STM imaging of nanometric 3D objects on a support: carbon nanotubes
||Electronic Properties of Novel Materials -- Progress in Molecular Nanostructures, 28 February - 3. March 1998, Kirchberg, Austria
||AIP Conference Proceedings
||American Institute of Physics
||Woodbury, New York
||Till now STM and AFM are the only tools able to probe in the same time the physical properties and
able to give information on the geometric parameters (diameter, length) of an individual nanotube.
However, tunneling through a nanotube is a much more complex phenomenon than STM imaging of
an atomically flat crystalline surface. Besides geometric convolution effects, and the resonant
tunneling through the two tunneling gaps: STM tip-nanotube, and nanotube-substrate, differences
in the electronic properties of the nanotube and of the support may play a major role. We used a
method based on the wave-packet dynamical calculation of time dependent tunneling current density
in the STM tip-nanotube-support system in order to separate the distortion arising in the STM image
formation process in pure geometric and electronic effects. The simulated line cuts for the case of a
nanotube on a support with similar electronic structure, and for the case of a nanotube on a support
with different electonic structure are coincident with experimental data. Out results show that the
interpretation of scanning tunneling spectroscopy data of carbon nanotubes has to be done with lots
1. L. P. Biró et al., Phys. Rev. B56(1997)12490.
2. L. P. Biró et al., Carbon, in press.
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