electrochemical insight into the cytochrome c adsorption on graphene and graphene oxide/self assembled monolayer surfaces and study of its electron transfer kinetics

The electrochemical property of cyt c on graphene (g) and graphene oxide (go)/self assembled monolayer (sam) surfaces were investigated by electrochemical techniques. electrochemical response of cyt c on g/sam showed an increase in peak separation and reduction in peak current. cyclic voltammetry (cv) and scanning electrochemical microscopy (secm) results, suggest that the adsorption of cyt c on g/sam is an unfavorable adsorption orientation for et, so that the et kinetics is higher on go/sam compared with g/sam. the results show that cyt c is immobilized onto the go/sam surface by electrostatic interaction; whereas on g/sam surface adsorbs by hydrophobic interaction.