Dear colleagues, I would like to use QE ESM for a study of an effect of deprotonation of self-assembled monolayer of alkanethiols adsorbed on gold surface in aqueous solution (with pH = 8) on the system work function and electrode surface charge. It is described as RCOOH + H2O -.> RCOO- + OH3+, creating an electrical double-layer at the SAM/solution interface. The deprotonation causes a SPR red-shift and I am trying to explain it. As the system is neutral I can use ESM with bc1. Could you please advise me how to introduce the charges of RCOO- and OH+ ions. Thank you.
Best regards, Jiri Kanka Optical biosensors dpt. Institute of Photonics and Electronics Czech Academy of Sciences Prague
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