首页|Novel one-pot sol-gel synthesis route of Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix
Novel one-pot sol-gel synthesis route of Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix
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NSTL
Elsevier
Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix are synthesized by a novel two-step surfactant sol-gel strategy, where the processes of hydrolysis, polycondensation and drying take place in a one-pot. The present approach is based on the combined action of oleic acid and oleylamine, which act sterically on the precursor micelles when a densification temperature is performed in a reducing atmosphere. The structural and magnetic evolution of the formed compounds is investigated, ranging from iron oxides such as Fe3O4 and FeO, to the formation of pure Fe3C/C samples from 700 oC onwards. Interestingly, Fe3C nanoparticles with a size of ~20 nm crystallize immersed in the carbon matrix and the surrounding environment forms an oriented encapsulation built by few-layered graphene. The nanostructures show a saturation magnetization of ~43 emu/g and a moderate coercivity of ~500 Oe. Thereby, an innovative chemical route to produce single phase Fe3C nanoparticles is described, and an effective method of few-layered graphene passivation is proposed, yielding a product with a high magnetic response and high chemical stability against environmental corrosion.
Chemical synthesisMagnetizationNanofabricationNanostructured materialsSol-gel processesTransition metal alloys and compounds
Gonzalez C.、Marin P.、Granados-Miralles C.、Varela M.、Castellano-Soria A.、Lopez-Sanchez J.、Navarro E.
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Instituto de Magnetismo Aplicado (IMA-UCM-ADIF)
Instituto de Cerámica y Vidrio (ICV-CSIC)
Instituto Pluridisciplinar & Departamento de Física de Materiales Universidad Complutense de Madrid (UCM)
NSTL
Elsevier
