Abstract
We have studied the thermal annealing effect on friction of alkanethiol self-assembled monolayers (SAMs) using atomic force microscopy and frictional force microscopy. The friction is found to increase with thermal annealing time once the annealing temperature is high enough. The change in friction is well correlated with the change in the SAM structure. From a densely packed (∛×∛)R30° phase to a (p×∛) stripe phase with lower density, the magnitude of friction is found to increase by ∼10 times. Such an increase in friction is proposed as being due to the less compact surface structure of the stripe phase, which opens up additional energy dissipation channels to the film.
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