2026-06-08T09:52:00Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/713162026-03-18T12:09:09Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Castellano Soria, Alberto author López Sánchez, Jesús author Granados Miralles, Cecilia author Varela Del Arco, María author Navarro Palma, Elena author González Pascual, César author Marín Palacios, María Pilar author 2022-01-07 Fe_3C/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 Fe_3O_4 and FeO, to the formation of pure Fe_3C/C samples from 700 degrees C onwards. Interestingly, Fe_3C nanoparticles with a size of similar to 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 similar to 43 emu/g and a moderate coercivity of similar to 500 Oe. Thereby, an innovative chemical route to produce single phase Fe_3C 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. Castellano-Soria, Alberto, et al. «Novel One-Pot Sol-Gel Synthesis Route of Fe3C/Few-Layered Graphene Core/Shell Nanoparticles Embedded in a Carbon Matrix». Journal of Alloys and Compounds, vol. 902, mayo de 2022, p. 163662. DOI.org (Crossref), https://doi.org/10.1016/j.jallcom.2022.163662 0925-8388 10.1016/j.jallcom.2022.163662 https://hdl.handle.net/20.500.14352/71316 http://dx.doi.org/10.1016/j.jallcom.2022.163662 Novel one-pot sol-gel synthesis route of Fe_3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix