Dipyrromethene–dodecanethiol self-assembled monolayers deposited onto gold electrodes

In the work presented, a dipyrromethene with a thiol group has been applied to gold electrode modification. The blocking behaviour of mixed dipyrromethene-thiol (DPT)/dodecanethiol (DDT) self-assembled monolayers (SAMs) has been studied as a function of pH using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It has been shown that hydrogen-bonding between adjacent ligands affects the pH properties of SAMs studied. In the modification solution, an optimum ratio dipyrromethene-thiol/dodecanethiol was found to get the strongest pH response of SAM. The dipyrromethene-thiol/dodecanethiol SAMs have been characterized also by FTIR and wettability contact angle measurements.The possible application of the mixed dipyrromethene-thiol/dodecanethiol SAMs presented will be discussed.