Structural and magnetic evolution of FexOy@carbon core-shell nanoparticles synthesized by a one-step thermal pyrolysis

Lyubutin, I. S.; Lin, Chun-Rong; Tseng, Yaw‐Teng; Spivakov, Aleksandr A.; Баскаков, А. О.; Starchikov, S. S.; Funtov, K.O.; Jhang, Cheng-Jhih; Tsai, Yih-Jaan; Hsu, Hua-Shu

doi:10.1016/j.matchar.2019.02.022

Cited by 16 publications

(14 citation statements)

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“…Nanostructured samples containing a magnetic core-carbon shell (Fe x O y @C) NPs and Ag NPs were fabricated in the twostage process. At the first stage, core-shell NPs were synthesized by pyrolysis using the approach described in [14]. 8 mmol Fe(NO 3 ) 3 •9H 2 O was dissolved in a mixture solution of oleylamine C 18 H 37 N (OLA) and oleic acid C 18 H 34 O 2 (OA), to be followed by several procedures for heating the solution: 140 • C for 0.5 h, 240 • C for 1 h and 370 • C for 1 h. The final reaction temperature 370 • C was chosen based on the results of [14] where the range of temperatures 350 • C-400 • C was used and wüstite phase formation was shown at higher temperatures.…”

Section: Synthesis Proceduresmentioning

confidence: 99%

“…Besides, the MCD spectra of magnetite and maghemite phases are quite different [25] which allows one to distinguish these two phases very well. This method was applied to study both the Fe x O y @C samples modified with Ag and analogous samples without Ag investigated earlier in [14].…”

Section: Introductionmentioning

confidence: 99%

“…Fe x O y @C, NPs modified with Ag in comparison with the Fe x O y @C NPs investigated earlier[14] by several authors of the team. The Fe x O y @C NPs were synthesized by pyrolysis of Fe(NO 3 ) 3 •9H 2 O, oleylamin (OLA), and oleic acid (OA) under the conditions based on the previously obtained results.…”

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confidence: 98%

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Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag

et al. 2020

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Core-shell Fe x O y @C nanoparticles (NPs) modified with Ag were studied with x-ray diffraction, transmission electron microscopy, energy dispersive elemental mapping, Mössbauer spectroscopy, static magnetic measurements, and optical magnetic circular dichroism (MCD). Fe x O y @C NPs synthesized by the pyrolysis process of the mixture of Fe(NO 3 ) 3 • 9H 2 O with oleylamine and oleic acid were added to a heated mixture of oleylamine and AgNO 3 in different concentrations. The final product was a mixture of iron oxide crystalline NPs in an amorphous carbon shell and Ag crystalline NPs. The iron oxide NPs were presented by two magnetic phases with extremely close crystal structures: Fe 3 O 4 and γ-Fe 2 O 3 . Ag is shown to form crystalline NPs located very close to the iron oxide NPs. An assumption is made about the formation of hybrid Fe x O y @C-Ag NPs. Correlations were obtained between the Ag concentration in the fabricated samples, their magnetic properties and the MCD spectrum shape. Introducing Ag led to a approximately linear decrease of the NPs saturation magnetization depending upon the Ag concentration, it also resulted into the MCD spectrum shift to the lower light wave energies. MCD was also studied for the Fe 3 O 4 @C NPs synthesized earlier with the same one-step process using different heat treatment temperatures, and MCD spectra were compared for two series of NPs. A possible contribution of the surface plasmon excitation in Ag NPs to the MCD spectrum of the Fe x O y @C-Ag NPs is discussed.

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Section: Synthesis Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag

et al. 2020

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“…In the first stage, the initial Fe 3 O 4 @C nanoparticles were synthesized by a one-step process described earlier in Ref. [ 17 ]. In a typical process, 8 mmol of Fe(NO 3 ) 3 ·9H 2 O, 20 mL of oleic acid, and 5 mL of oleylamine were mixed in a three-neck flask.…”

Section: Methodsmentioning

confidence: 99%

“…In a typical process, 8 mmol of Fe(NO 3 ) 3 ·9H 2 O, 20 mL of oleic acid, and 5 mL of oleylamine were mixed in a three-neck flask. To remove water, the mixture was heated to 140 °C and kept at this temperature for 60 min, then the temperature was raised to 240 °C and maintained for 1 h. The final temperature of the reaction was 380 °C for 1 h. This temperature was chosen because it was shown to provide formation of a single-phase magnetic core of particles corresponding to magnetite Fe 3 O 4 in [ 17 ]. The reactions were carried out under an argon flow, and the temperature was controlled by a thermocouple.…”

Section: Methodsmentioning

confidence: 99%

Carbon Double Coated Fe3O4@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption

et al. 2022

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This work is devoted to the study of magnetic Fe3O4 nanoparticles doubly coated with carbon. First, Fe3O4@C nanoparticles were synthesized by thermal decomposition. Then these synthesized nanoparticles, 20–30 nm in size were processed in a solution of glucose at 200 °C during 12 h, which led to an unexpected phenomenon—the nanoparticles self-assembled into large conglomerates of a regular shape of about 300 nm in size. The morphology and features of the magnetic properties of the obtained hybrid nanoparticles were characterized by transmission electron microscopy, differential thermo-gravimetric analysis, vibrating sample magnetometer, magnetic circular dichroism and Mössbauer spectroscopy. It was shown that the magnetic core of Fe3O4@C nanoparticles was nano-crystalline, corresponding to the Fe3O4 phase. The Fe3O4@C@C nanoparticles presumably contain Fe3O4 phase (80%) with admixture of maghemite (20%), the thickness of the carbon shell in the first case was of about 2–4 nm. The formation of very large nanoparticle conglomerates with a linear size up to 300 nm and of the same regular shape is a remarkable peculiarity of the Fe3O4@C@C nanoparticles. Adsorption of organic dyes from water by the studied nanoparticles was also studied. The best candidates for the removal of dyes were Fe3O4@C@C nanoparticles. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for cationic dye methylene blue (MB) and anionic dye Congo red (CR). The equilibrium data were more consistent with the Langmuir isotherm and were perfectly described by the Langmuir–Freundlich model.

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Functionalized Magnetic Nanoparticles for Chemotherapy Applications

Kesharwani,

Jain,

Verma

et al. 2024

Functionalized Magnetic Nanoparticles for Theranostic Applications

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Structural and magnetic evolution of FexOy@carbon core-shell nanoparticles synthesized by a one-step thermal pyrolysis

Cited by 16 publications

References 49 publications

Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag

Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag

Carbon Double Coated Fe3O4@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption

Functionalized Magnetic Nanoparticles for Chemotherapy Applications

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Structural and magnetic evolution of FexOy@carbon core-shell nanoparticles synthesized by a one-step thermal pyrolysis

Cited by 16 publications

References 49 publications

Characterization of the iron oxide phases formed during the synthesis of core–shell FexOy@C nanoparticles modified with Ag

Characterization of the iron oxide phases formed during the synthesis of core–shell FexOy@C nanoparticles modified with Ag

Carbon Double Coated Fe3O4@C@C Nanoparticles: Morphology Features, Magnetic Properties, Dye Adsorption

Functionalized Magnetic Nanoparticles for Chemotherapy Applications

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Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag

Characterization of the iron oxide phases formed during the synthesis of core–shell Fe_xO_y@C nanoparticles modified with Ag