A contact angle and ToF-SIMS study of SAM-thiol interactions on polycrystalline gold

▶ Interaction of a PEG terminated SAM on non-textured gold with dodecanethiol in solution leads to no noticeable exchange over the first 3 hrs and then asymptotically approaches ∼50% replacement. ▶ The reverse exchange (dodecanethiol SAM with TPEG) does not show such an induction time and proceeds to completion.