List of records in nano database
||Computation of STM images of carbon nanotubes
||Int. J. Quant. Chem.
||Scanning tunneling microscopy (STM) is the only
tool making it possible to study both the
topography and the electronic structure of
carbon nanosystems at a sub-nanometer resolution.
The interpretation of the STM images of carbon
nanostructures is more complicated than in the
case of a planar crystalline surface since
different quantum effects distort the image that
the microscope gives of a nano-object.
Because of these difficulties, computer simulation is a helpful tool in the analysis
of experimental data. Two theoretical
approaches are considered to understand the
formation of the image of a nanotube in STM:
first the quantum-mechanical dynamics of a wave
packet, which allows us to investigate how
the tunneling current sets up between the tip
and a nanotube supported by a substrate, and,
second, a tight-binding perturbation theory
of STM that allows us to calculate realistic
images and scanning tunneling spectra of carbon
nanostructures. An atlas of computed STM
images is provided for a series of 27 single-wall
nanotubes with diameter around 1.3 nm.
Warning: all transactions are logged!