Novel one-pot sol-gel synthesis route of Fe_3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix



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Castellano Soria, Alberto and López Sánchez, Jesús and Granados Miralles, Cecilia and Varela del Arco, María and Navarro Palma, Elena and González Pascual, César and Marín Palacios, María Pilar (2022) Novel one-pot sol-gel synthesis route of Fe_3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix. Journal of alloys and compounds, 902 . ISSN 0925-8388

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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.

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CRUE-CSIC (Acuerdos Transformativos 2022)

©2022 The Authors. Published by Elsevier B.V.
This work has been supported by the Ministerio de Ciencia e Innovacion (MCINN), Spain, through the projects: MAT2015-65445-C2-1-R, MAT2017-86450-C4-1-R, MAT2015-67557-C2-1-P, RTI2018-095856-B-C21, RTI2018-095303-A-C52, PIE: 2021-60-E-030, PIE: 2010-6-OE-013; and Comunidad de Madrid, Spain, by S2013/MIT-2850 NANOFRONTMAG and S2018/NMT-4321 NANOMAGCOST. The authors are also grateful for the electron mi-croscopy characterization performed in the Centro Nacional de Microscopia Electronica at the Universidad Complutense de Madrid (ICTS ELECMI, UCM) , support from MCINN grant #RTI2018-097895-B-43. C.G.-M. acknowledges the financial support from MICINN through the "Juan de la Cierva" Program (FJC2018-035532-I).

Uncontrolled Keywords:Iron carbide nanoparticles; X-ray-diffraction; Magnetic-properties; Metal carbides; Facile synthesis; Nitride; Sol-gel processes; Chemical synthesis; Nanostructured materials; Nanofabrication; Transition metal alloys and compounds; Magnetization
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:70486
Deposited On:21 Feb 2022 13:18
Last Modified:04 May 2022 11:55

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