Molecular dynamics simulations incorporating explicit gold atoms in the simulations have been carried
out for alkanethiol self-assembled monolayers chemisorbed on the Au(111) surface. The structural properties
of the monolayer are evaluated for two force fields: one in which the Au−S−C bond is fixed (FF I), and
the other in which it is flexible (FF II). The influence of these force fields on the structural properties of
HS(CH2)14CH3 on the structured Au surface is compared at different temperatures. FF I yields greater
tilt angles and a smaller film thickness when compared with FF II. Both of the force fields predict that
the tilt angles do not follow a monotonic decrease with temperature but show minima around 200 K.
Simulations carried out at different chain lengths at 300 K reveal that FF II predicts a greater film
thickness than FF I; however, the difference is within 1 Å.
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