Electrografting of gold and graphene surfaces by functional p N maleimido phenyl groups was performed by reduction of p N maleimido phenyldiazonium tetrafluoroborate. The reduction was carried out using cyclo voltammetry coupled with micro gravimetric measurements by means of electrochemical quartz crystal microbalance EQCM . The overall deposited mass on gold was higher than on graphene. However, the Faradaic efficiency was lower on Au 14 compared to graphene 22 after the first potential scan. Subsequently, the maleimide functional groups have been tested for immobilization of terminal thiols using 2 4 nitrobenzene ethane thiol for the functionalized graphene surface and a cysteine modified peptide for the functionalized gold surface. The functionalization by p N maleimido phenyl groups and the following thiol coupling of the particular surface was proven by infrared spectroscopic ellipsometry IRSE . In addition, the interaction of the tetrabutylammonium and tetrafluoroborate ions present in the electrolyte with the Au and graphene electrodes was investigated by EQCM and revealed less electrostatic interaction of graphene with these ions in solution compared to the metal Au surface