The formation and functionalization of monolayers can be studied by means of a quartzcrystal microbalance. This method was used along with ellipsometric and IR-spectroscopic investigations to prove that a monolayer forms on adsorption of 3-aminopropyl-trimethoxysilane (APS) on an aluminum oxide substrate. This surface-bound APS reacts with gaseous chlorodimethylsilane quantitatively to form an immobilized dimethylsilylammonium salt.
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Kurth et al. (1992) studied this question.
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