Effect of Nitrophenyl Functionalization on the Magnetic Properties of Epitaxial Graphene

Abstract

International audienceGraphene displays unprecedented electronic properties including room-temperature ballistic transport and quantum conductance, and because of its small spin-orbit interaction, graphene has the potential to function as the building block of future spintronic devices. Theoretical calculations indicate that a defective graphene sheet will be simultaneously semiconducting and magnetic; thus it would act as a room-temperature magnetic semiconductor. Recently, ferromagnetic ordering at room temperature has been observed by magnetometry measurements on bulk samples of reduced graphene oxide

Organometallic Chemistry of Carbon Nanotubes and Graphene

“…This type of chemistry has been widely used as a means for bandgap engineering in graphene [29,30], and examples include hydrogenation [31,32], halogenation [29,33], oxidation (ozonolysis) [34], carboxylation [35], hydroxylation and epoxidation [36][37][38][39], radical additions [2,4,16,30,[40][41][42][43][44][45][46][47], carbene addition [48][49][50], nitrene addition [51,52], Diels-Alder reactions [17,53] including benzyne addition [54,55] and 1,3-dipolar cycloaddition [56] reactions. The graphene derivatives isolated to date, when incorporated in electronic field effect devices, show low conductivity and significantly reduced carrier mobility.…”

Covalent nitrophenyl diazonium functionalized silicene for spintronics: a first-principles study

“…[31][32][33][34][35][36][37][38][39][40][41] For example, NPD functionalized graphene exhibits field-controlled magnetic behavior. 42,43 A recent experiment demonstrated that the NPD modification of graphene can be spatially controllable, 40 which makes the NPD functionalization technique particularly useful for tailor-made twodimensional material design.…”

Magnetoelectric effect in functionalized few-layer graphene

“…This value should be compared to the spinpolarized edge state of graphene nanoribbons, which has a polarization energy of ∼20 meV per edge atom 33 . We note that the creation of graphene nanoribbons with well controlled edges is probably more difficult than the creation of covalently functionalized graphene samples [10][11][12] .…”

“…We considered H atoms as the test molecule, because of its high reactivity with C and its small steric size compared to the other adsorbates, may help the diffusion to other layers. Bigger molecules, in particular NPD, were not considered due to their periodic coverage recently observed [10][11][12] . For two H atoms at the same layer, but at different sublattices (A 1 B 1 ), E generates a spin moment of ∼0.10 µ B (see Figure 3a).…”

“…Some experiments have shown that the functionalization of graphene by H 6,7 , F 8,9 and nitrophenyl diazonium molecules (NPD) [10][11][12] induce magnetic behavior. Through extensive ab initio electronic structure calculations, we show that the magnetic properties of covalently functionalized graphene can be manipulated by an external electric field.…”