The Effect of Surface Preparation on Apparent Surface pKa's of ω-Mercaptocarboxylic Acid Self-Assembled Monolayers on Polycrystalline Gold
作者： Stuart C. Burris , Yi Zhou , Winston A. Maupin , Andrew J. Ebelhar , Michael W. Daugherty
DOI: 10.1021/JP077052W
关键词:
摘要: We have measured the apparent surface pKa values of self-assembled monolayers (SAMs) formed from 3-mercaptopropionic acid (3-MPA) and thioctic (TA) on evaporated gold film electrodes with a range roughness (Ra 1.3 to 6.3 nm as by AC mode atomic force microscopy). The is induced controlled electrochemical etching via multiple potential cycles between 0.2 1.5 V (versus Ag/AgCl/1.0 M KCl) in 100 mM H2SO4 KCl concentrations ranging 0.10 10 mM. pKa's are determining capacitance using impedance spectroscopy ionic strength (μ = 0.25 M) buffer solutions. results for 3-MPA striking, exhibiting strong logarithmic correlation (R2 0.988) concentration used solutions pKa. Over concentrations, shifts 6.5 8.4. However, relationship betwe...
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