2026-06-08T07:26:32Zhttps://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

Novel one-pot sol-gel synthesis route of Fe_3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix Castellano Soria, Alberto López Sánchez, Jesús Granados Miralles, Cecilia Varela Del Arco, María Navarro Palma, Elena González Pascual, César Marín Palacios, María Pilar 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. 2023-06-22T10:40:37Z 2023-06-22T10:40:37Z 2023-06-22T10:40:37Z 2022-01-07 journal article https://hdl.handle.net/20.500.14352/71316 0925-8388 10.1016/j.jallcom.2022.163662 eng info:eu-repo/grantAgreement/MINECO//MAT2015-67557-C2-1-P/ES/NANOPARTICULAS Y NANOESTRUCTURAS MAGNETICAS FUNCIONALES PARA LA ACTIVACION TERMICA Y CONTROL IN-SITU DE PROCESOS FISICOS Y QUIMICOS/ S2013/MIT-2850/NANOFRONTMAG-CM S2018/NMT-4321/NANOMAGCOST-CM 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 https://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Elsevier