In situ synthesis of highly stable FeCo alloy encapsulated in carbon from ethanol

Lopes, Antônio Marcelo Silva; Barbosa, Felipe Fernandes; Torres, Marco Antônio; Pergher, Sibele B.C.; Braga, Tiago Pinheiro

doi:10.1016/j.mtcomm.2022.103900

Cited by 1 publication

(2 citation statements)

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“…In relation to the two nanomaterial types, many researchers have produced studies dealing with the synthesis, characterization, and applications of such nanomaterials using different nanocarbon allotropes either in core/shell models [13,20,36], thin film substrates [25], or as interstitial dopants [43][44][45][46]. In this work, the synthesis, characterization, and comprehensive study of the inseparably linked structural, morphological, and magnetic properties of a new line of hybrid nanomaterials composed of Fe-Co nanoalloys grown on ND nanotemplates (Fe-Co/NDs) built upon our group's expertise in the development of such hybrid nanostructured magnetic materials [47][48][49] is presented.…”

Section: Introductionmentioning

confidence: 99%

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Novel Hybrid Ferromagnetic Fe–Co/Nanodiamond Nanostructures: Influence of Carbon on Their Structural and Magnetic Properties

Ziogas,

Bourlinos,

Chatzopoulou

et al. 2024

Magnetochemistry

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This study introduces a novel magnetic nanohybrid material consisting of ferromagnetic (FM) bcc Fe–Co nanoparticles (NPs) grown on nanodiamond (ND) nanotemplates. A combination of wet chemistry, which produces chemical precursors and their subsequent thermal treatment under vacuum, was utilized for its development. The characterization and study of the prepared samples performed with a range of specialized experimental techniques reveal that thermal treatment of the as-prepared hybrid precursors under a range of annealing conditions leads to the development of Co-rich Fe–Co alloy NPs, with average sizes in the range of 6–10 nm, that exhibit uniform distribution on the surfaces of the ND nanotemplates and demonstrate FM behavior throughout a temperature range from 2 K to 400 K, with maximum magnetization values ranging between 18.9 and 21.1 emu/g and coercivities ranging between 112 and 881 Oe. Moreover, 57Fe Mössbauer spectroscopy reveals that apart from the predominant bcc FM Fe–Co phase, iron atoms also participate in the formation of a secondary martensitic-type Fe–Co phase. The emergence of this distinctive phase is attributed to the diffusion of carbon atoms within the Fe–Co lattices during their formation at elevated temperatures. The source of these carbon atoms is related to the unique morphological properties of the ND growth matrices, which facilitate surface sp2 formations. Apart from their diffusion within the Fe–Co NP lattice, the carbon atoms also reconstruct layered graphitic-type nanostructures enveloping the metallic alloy NPs. These non-typical nanohybrid materials, reported here for the first time in the literature, hold significant potential for use in applications related, but not limited to, biomedicine, biopharmaceutics, catalysis, and other various contemporary technological fields.

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Section: Introductionmentioning

confidence: 99%

“…Figure13. Magnetic susceptibility vs. temperature measurements of the non-enriched NHD-700,30m (a) and57 Fe-enriched En-NHD-700,30m-SC (b) samples under an applied field of 99 Oe.…”

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confidence: 99%