▎ 摘　　要

This study focuses on covalent grafting of Fe3O4 magnetic nanoparticles (MNPs) to graphene oxide nanosheets (GNOS) via three different chemical routes. To this purpose, firstly, dopamine-functionalized Fe3O4 (Fe3O4/DA) nanoparticles were firmly attached onto the surface of GONS by activation of carboxylic groups of GONS via thionyl chloride (SOCl2), anhydride formation by using trifluoro acetic acid (TFAA) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide/N-hydroxysuccinimide (EDC/NHS) to form Fe3O4/DA/GONS. The attachment of Fe3O4 MNPs on the GONS surface was evaluated and compared by using FT-IR, XRD, TEM, TGA, VSM, TEM and SAED techniques. The results showed that, depending on the route used, the density and immobilization site of Fe3O4 MNPs can be different.