Tuning of magnetic behaviour in nitrogenated graphene oxide functionalized with iron oxide

摘要

Two-dimensional graphene oxide (GO) nanomaterials offer interesting physical/chemical properties and have been explored for potential use in electronics, magnetic, catalysis, and energy storage applications, because of its high charge-carrier mobility and high specific surface area. This study investigates the electronic and magnetic properties of nitrogenated graphene oxide (GO-N-x) and nitrogenated graphene oxide functionalized with iron oxide (GO-N-x:Fe). Four different nitrogen (N) precursor viz. ammonium hydroxide (NH4OH), hexamethylenetetramine (C6H12N4), acetonitrile (C2H3N), and carbamide (CH4N2O) are used to synthesis "GO-N-x" using chemical route. As C6H12N4 based-GO-N-x shows higher ferromagnetism, thus it is further functionalized with iron oxide using three different iron (Fe) precursors viz. ferric oxide (Fe2O3), ferroso-ferric oxide (Fe3O4), and iron oxide-hydroxide (FeOOH) to tune this room temperature ferromagnetism (RTFM). The electronic structure of "GO-N-x" and "GO-N-x:Fe" are characterized using C 1s, O 1s, N is and Fe 2p core-level X-ray photoelectron spectroscopy (XPS) and their corresponding magnetic behaviours are correlated with the SQUID-measured M-H loops. The magnetic moment changes due to the conversion and formation of different nitrogen bonded carbon along with the different phase of iron oxide. The tuning of magnetization in "GO-N-x" and "GO-N-x:Fe" using different N-precursors and/or Fe-precursors is an efficient route to tailor the electronic/magnetic properties of graphene-oxide for different electronic and magnetic device applications.