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| - Comparative Investigations of the Packing and Ambient Stability of Self-AssembledMonolayers of Alkanethiols on Gold and Silver by Friction Force Microscopy
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| - The frictional behavior of self-assembled monolayers (SAMs) formed by the adsorption of alkanethiols ontosilver surfaces has been investigated by friction force microscopy (FFM) and compared with the behaviorobserved for SAMs on gold. Monolayers have been formed from adsorbates with different terminal groupfunctionalities and alkyl chain lengths. Significant differences in frictional behavior are observed for monolayerson the two different substrates, and these may be interpreted in terms of variations in the packing density ofthe adsorbate molecules. The collapse of monolayer order following ambient oxidation may conveniently bestudied using FFM, revealing that methyl terminated SAMs on silver exhibit substantially enhanced stabilityas a consequence of their increased packing density. Behavior is different for carboxylic acid terminatedSAMs, indicating that the constraints on the packing of the two types of adsorbate are different.
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