Adsorption Structures of Acetic Acid on Ge(100) at
High Coverage
Version 2 2017-08-21, 18:55
Version 1 2017-08-21, 18:50
Posted on 2017-08-21 - 18:55
The adsorption of
acetic acid on Ge(100) in the submonolayer and
saturation coverages was investigated using scanning tunneling microscopy
(STM) and density functional theory (DFT) calculations. At room temperature,
acetic acid formed both monodentate and end-bridged structures on
Ge(100) while paired adsorption structures also appeared. Increasing
the amount of adsorbed acetic acid resulted in more pairing between
adsorbates in straight and diagonal directions relative to the dimer
row. The stabilization through pairing was theoretically confirmed
for the adsorption structures and was very high for monodentate structures.
At saturation coverage, the adsorbates are closely packed in the form
of a square, parallelogram, or rectangle. After annealing at 380 K,
the successive adsorptions showed 2 × n periodicity.
Annealing at 410 K resulted in an ordered array of adsorbate over
a long-range along the dimer row, which was identified to be several
adsorbed acetic acid with the most stable on-top bidentate structure.
Simulated STM images of the relatively stable configuration could
explain the experimentally observed images.
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Hwang, Eunkyung; Kim, Do Hwan (2017). Adsorption Structures of Acetic Acid on Ge(100) at
High Coverage. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b04626
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