Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces
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The pH of deareated 50mM NaF is about 8.2–8.5 whereas the measured pH of 1mM NaF was roughly 1 pH unit lower. Given that the voltammetric peak is very sensitive to pH we had to adjust the pH of 1mM NaF to 8.3 using dilute NaOH. However, the amount of NaOH added is negligible in terms of the electrolyte's total ionic strength.
We chose 5mM ionic strength buffers as a compromise between buffering capacity and minimized sodium ion concentrations. At the pH values studied, a 5mM NaPB ionic strength buffer has a sodium ion concentration of about 10mM. This level of cation concentration allowed us to repetitively cycle the potential long enough to obtain CVs whose peak potentials were steady before the peak heights decayed to background levels. We were reluctant to use lower concentrations due to diminished buffering capacities of such solutions.
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