Loosely packed hydroxyl-terminated SAMs on gold.

摘要: We report the preparation of loosely packed hydroxyl-terminated self-assembled monolayers (SAMs) on gold by adsorption bis(11,11‘-dithioundecyl)perfluoroheptanoate and base-mediated cleavage fluorocarbon terminal group. As shown through complementary characterization methods, partially fluorinated SAM exhibits a structure in which outer surface contains mostly −CF3 groups, groups are slightly canted average, hydrocarbon chains underneath fluidlike state. Upon group, alkyl relax into an increasingly canted, The resulting monolayer packing exposes both methylene hydroxyl functionalities, yielding intermediate energy (θa(H2O) ≈ 68°). compared to densely prepared from bis(11-hydroxyundecyl)disulfide, cleaved films thinner because greater average chain cant exhibit ∼50% higher capacitance factor 5...