Microscopy study reveals self-assembled monolayer formation from dissolving octadecylphosphonic acid multilayers on mica, uncovering a multistep surface assembly mechanism.
The process of self-assembled monolayer (SAM) formation by the spread coating of an octadecylphosphonic acid (OPA) solution onto a mica surface is investigated by atomic force microscopy. When concentrated solutions are employed, a novel mechanism of SAM formation is found: OPA multilayers, mostly bilayers, are initially deposited on the mica surface. As time passes, these large multilayers break apart and evolve into disorganized monolayers. Following a rapid evolution, such monolayers are found to transform into well-ordered OPA self-assembled monolayers.
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Neves et al. (2001) studied this question.
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