Abstract
Studies of the wettability and friction of self-assembled monolayers (SAMs) generated from the terminally fluorinated alkanethiols (CF 3(CH 2) nSH, n = 9–15) on gold are reported. These data were compared to those of SAMs generated from the non-fluorinated analogs (CH 3(CH 2) nSH, n = 9–15). The CF 3-terminated SAMs were less wettable by hexadecane and methylene iodide, but surprisingly more wettable by water and glycerol than were the CH 3-terminated SAMs. Measurements of friction by atomic force microscopy (AFM) revealed an approximate threefold increase in friction on the CF 3-terminated films compared to the CH 3-terminated films. A new model for the frictional response of fluorinated SAMs is proposed.
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