Exchange Interaction of Itinerant Electron Donors of Tetrakis (Dimethylamino) Ethylene with Localized Electrons in Graphene

We report on indirect exchange interaction between itinerant and localized electron in tetrakis(dimethylamino) ethylene (TDAE)–treated graphene. TDAE, after getting attached to the graphene, forms fragments such as, tetrakisdimethylamino–1,2–dioxetane, tetramethylurea, tetramethyloxamide, tetramethylhydrazine, bis(dimethylamino)methane, and dimethylamine. These fragments, carrying itinerant electrons on charge–transfer generates spin ordering in localized electrons at host carbon network. The nature of interaction between itinerant and localized electrons is short range, repulsive, and indirect exchange. The strength of interaction depends upon the ratio of coulombic repulsive energy to hopping energy. Possible mechanism of magnetization in TDAE-treated graphene is discussed.