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5nm x 5 nm image
z range: 0.05 nm |
Atomic resolution of HOPG
An STM image of graphite illustrates both bright and dark spots, corresponding to high (bright) and low (dark) tunneling.
Out of the lattice model of graphite one can see that there are two different positions of the carbon atoms in the graphite crystal lattice (see e.g. R.C. Tatar et al. Phys Rev B 25 (1982) 4126).
The easyScan STM routinely resolves atomic structure of samples such as HOPG.
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6x6nm imag
z-range 0.8nm
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Charge Density
Waves on TaS2
TaS2 (and TaSe2) exhibit an electronic phase transition from a normal into a condensed state which is called the Charge Density Wave (CDW) state. The transition is caused by an electron-phonon coupling. STM images of TaS2 show a triangular atomic lattice (a0=0.33 nm) with a superimposed CDW lattice of about 3.5 a0. The CDW lattice is rotated 11° with respect to the atomic lattice. |
13x13nm image
z-range 2nm
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Organic Thin
Film
2-dimensional molecular crystals of dotriacontan and octadecanol molecular layers prepared on HOPG.
Instructions on the properties of such crystals and how to prepare them can be found in "J.P. Rabe, S. Buchholz,Commensurability and Mobility in Two-Dimensional Molecular Patterns on Graphite, Science 253 (1991) 424-427"
Contact us for a guide on how to prepare the sample.
The images are provided by Dr. J. Francis Wolf Humboldt-University, Berlin, GERMANY |
150x150nm image |
Self Assembled Monolayers (SAMs)
STM images on self-assembled monolayers (SAMs) of 1-octanethiol on a gold/mica substrate. Data recorded by Erin Iski of the Sykes Group at Tufts University, MA, USA
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