Novel one-pot sol-gel synthesis route of Fe3C/few-layered graphene core/shell nanoparticles embedded in a carbon matrix

Sol-Gel Synthesis Control of Iron-Cobalt Alloy/Ferrite Core/Shell Nanoparticles Supported by a Carbon Medium with Semi-Hard Magnetic Features

“…1-b2). The roughly invariance of the crystalline domain size for both phases manifests that their growth might be confined by the carbon matrix influence [56,58]. Additionally, all the Fe:Co diffractograms display a peak at 2θ = 14.01º corresponding with the (002) crystallographic plane of graphite (P6 3 mc), and lattice vector of a C-g = 2.553(5) Å and c C-g = 6.924(4) Å [58].…”

“…The surfactants used in the synthesis, with a molar ratio of 1ON:1OA, act synergistically constraining the particle size of primal Fe, Co or Fe-Co oxidized NPs formed at temperatures < 500 ºC (see Supporting Information). Densification temperatures up to 700 ºC ensure an effective carbothermal reduction of the Fe-Co-oxides giving rise to Fe 3 C or Fe-Co-alloyed NPs embedded in a carbon matrix [56]. The surfactant concentration of 5 mmol (ON, OA) is also adjusted, optimizing the lowest presence of carbon matrix.…”

“…Firstly, the null content of Co (1Fe:0Co data) produces the orthorhombic phase of the intermetallic compound Fe 3 C (cementite), with a crystallographic group Pnma. From the Rietveld refinement, the lattice parameters are a Fe3C = 5.093(1) Å, b Fe3C = 6.749(1) Å, and c Fe3C = 4.529(1) Å, according to the literature [39,56]. Secondly, the smallest amount of Co introduced (5%, for the 19Fe:1Co sample) causes the emergence of a bcc phase (Im-3 m) with peaks at 2θ = 23.80, 33.91, 41.85, 48.71 and 54.93º, matching with the crystallographic planes indexed in Fig.…”

Synthesis of Some Functional Oxides and Their Composites Using Sol-Gel Method

“…In addition, when the pH 3, the sol-gel structure was destroyed, and the optimal pH value was 2, where the best performance of CaO sorbent was achieved. A. C.-Soria et al [13] fabricated Fe 3 C/few-layered graphene core/shell nanoparticles, with potential magnetic properties, embedded in a carbon matrix by a modified two-step surfactant sol-gel method, where the hydrolysis, polycondensation, and drying took place in a one-pot. Hashjin et al [14] tuned up the sol-gel technique for preparing high-durable superhydrophobic coatings.…”

Green Synthesis of Superparamagnetic Iron Oxide Nanoparticles with Eucalyptus globulus Extract and Their Application in the Removal of Heavy Metals from Agricultural Soil

“…Accordingly, the use of chemical methods for the synthesis of nanoparticles in biomedical applications was restricted, due to the chemicals' toxicity, instability, and lower biocompatibility [19]. In addition, several methods and techniques have been linked to the reduction process of precursor salts using inorganic chemical agents [20], including the sol-gel method [21] and techniques such as hydrothermal synthesis [22], laser ablation [23], thermal annealing [24], and, recently, "electric explosion" [25]. These methods and techniques have achieved a good mastery of complete reduction synthesis processes; however, they are very complex, costly, and unsustainable (highly toxic).…”