Studies on Gold Electrode Modified by Alkanethiol SAM

Self-assembled monolayer (SAM) on gold electrode has been extensively studied in electrochemistry. It is a good model for study the electron transfer through the SAM from metal to redox couple in the solution or tethered on the surface of monolayer. For a pinehole-free monolayer, electron tunneling is considered as the mechanism of electron transfer through the film. The detail of the process in electrochemistry is not clear though there are a lot of publications on SAM research. In this paper,the electrochemical behavior of pinehole-free alkanethiol modified SAM electrode was investigated at different potential in the solution containing various concentration Fe(CN)₆^3-/4- ions. It was found that the apparent resistance could be attributed mainly to the resistance of SAM film.