0. Graphene has attracted extensive attention because of its unique electronic, thermal, me- chanical,

optical properties [1]. GO, an oxidized form of graphene is an important material for the development of polymer nanocomposites due to presence of oxygenated functionalities such as hydroxyl, epoxide, carbonyl and carboxyl groups [2]. Surface modification of GO allows it to disperse more easily in water, organic solvents and different matrices which is advantageous for combining GO with ceramic or polymer matrices to improve the material properties [1]. In generally, chemical methods are used for surface modification, however, there is a possibility that these methods may contain chemical contamination [3]. As is well- known, enzymes are highly efficient and specific catalysts. Enzymatic methods, which are more modern and environmentalist and advantageous compared to chemical techniques, have become increasingly important in recent years [4]. For these reasons, in this study, enzymatic surface modification process by lipase enzyme catalysis with methacrylic acid was studied on the surface of graphene oxide. Modified particles have been characterized by Fourier Transform Infrared Spectrophotometer (FTIR), Scanning Electron Microscope (SEM) and Thermogravimetric Analysis (TGA).