(649e) Reversible Reactions of CO2 with Amino-Terminated SAM's Employing a Protection/Deprotection Mechanism for Smart Surface Synthesis

Self assembled monolayers (SAM's) serve as one of the simplest techniques for control of surface properties and wetabillity. However, the control over the morphology, uniformity and terminal group reactivity of the film is heavily dependent not only on the experimental parameters, but also the availability and presence of different interaction and binding sites. Silicon (Si) substrates were functionalized using solutions of N-(2-aminoethyl)-(3-aminopropyl)-methlydimethoxysilane (AEAPMDS), N-(6-aminohexyl)-(3-aminopropyl)-trimethoxysilane (AHAPTS), Trimethoxysilylpropyl-polyethyleneimine (PEI-Silane) and Aminopropyl-Trimethoxysilane (APS) coupling agents. Due to the presence of the free amines, these agents exhibit an increased number of interactions with the clean Si substrates, leading to difficulties in obtaining large defect free films of uniform morphology and reactivity. This study investigates the reversible reaction of carbon dioxide (CO2) with amine terminated SAMs to provide a non-ionic to ionic change in surface chemistry, thus providing reversible surface properties. We have also investigated the use carbon dioxide (CO2) as a protecting agent to enhance the ability to form uniform SAMs of amine containing moieties.