Synthesis of Magnetic Nanoparticles by Ultrashort Pulsed Laser Ablation of Iron in Different Liquids

Kanitz, Alexander; Hoppius, Jan S.; Sanz, M. M.; Maícas, M.; Ostendorf, Andreas; Gurevich, Evgeny L.

doi:10.1002/cphc.201601252

Cited by 56 publications

(53 citation statements)

References 50 publications

(99 reference statements)

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“…The optimal thickness of the liquid is defined by a compromise between two effects: on the one hand, it should be less than the self-focusing distance (to avoid self-focusing and supercontinuum generation); on the other hand, it should be larger than the radius of the bubbles generated upon ablation (to avoid surface waves and breakup of the liquid surface). For most of our experiments it corresponds to the liquid height of approximately 4 mm [14,36].…”

Section: Discussionmentioning

confidence: 99%

Optimization of femtosecond laser processing in liquids

Hoppius

Maragkaki

Kanitz

et al. 2019

Applied Surface Science

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In this paper we analyze femtosecond laser processing of metals in liquids searching for optimal conditions for predictable ablation. Incident laser pulses are stretched or compressed, self-focused and scattered on bubbles and on surface waves in the liquid environment. Influence of these effects on the laser intensity distribution on the target surface is discussed and optimal processing parameters are suggested.

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Section: Discussionmentioning

confidence: 99%

Optimization of femtosecond laser processing in liquids

Hoppius

Maragkaki

Kanitz

et al. 2019

Applied Surface Science

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“…Another disadvantage is the effect of the atmosphere, which causes the nanoparticles to oxidize. Iron carbide nanoparticles produced through laser ablation of an iron target in an organic solvent have been reported [69][70][71] ; however, the particles were oxidized by the oxygen dissolved in the solvent. Therefore, we employed an airtight vessel ( Fig.…”

Section: Laser Ablation In Organic Solvents To Produce Iron Carbidesmentioning

confidence: 99%

Iron-based Nanoparticles and Their Mössbauer Spectra

Yamada

Nishida

2019

RADIOISOTOPES

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This review describes the synthesis of iron-based nanoparticles. Iron oxyhydroxide, iron oxide, iron carbide, and iron sulfide nanoparticles have been produced using various methods. Feroxyhyte δ-FeOOH nanoparticles were produced by the oxidation of precipitates obtained by hydrazine reduction of iron chloride. Similar nanocomposites doped with foreign atoms (Ag, Cu, or Zn) have been produced as well. Iron oxide (γ-Fe 2 O 3 ) nanoparticles have been produced by a polyol method. When a sulfide source was added into the solution during synthesis, iron sulfide nanoparticles were obtained. Using this technique, a metastable trivalent iron sulfide (Fe 2 S 3 ) was successfully synthesized. Amorphous iron/carbon particles were obtained by the sonochemical synthesis of ferrocene in diphenylmethane. Subsequent heating of the amorphous particles produced Fe 3 C, α-Fe, and γ-Fe nanoparticles. Laser ablation of iron metal in an organic solvent produced iron carbide nanoparticles. The reaction mechanism and the structures of the nanoparticles were studied using Mössbauer spectroscopy as well as X-ray diffraction and transmission electron microscopy.Key Words: iron-based nanoparticles, Mössbauer spectroscopy, polyol methods, sonochemistry, laser ablation in liquid doped with foreign atoms are intriguing because doi: 10.3769/radioisotopes.68.125 126 Vol. 68,No. 3 RADIOISOTOPES they are known to exhibit unique magnetic and optical properties. 10) A variety of methods have been employed to synthesize nanoparticles; e.g. the hydrazine reduction method, polyol method, sonochemical method, and laser ablation in a liquid. Our recent results, mainly based on Mössbauer spectroscopy, will be presented in the following sections. Iron oxide nanoparticles and their compositeswith foreign atoms 2 1 Feroxyhyte nanoparticles Feroxyhyte (δ-FeOOH), a very intriguing species of the iron oxide family, is the only ferric oxyhy-droxide that exhibits significant magnetization at room temperature. 11) Generally, feroxyhyte is not as abundant as other iron oxides/oxyhydroxides in nature, and hard to synthesize because of its instability.Feroxyhyte nanoparticles were found to be a promising photocatalyst for hydrogen production, 12) and the enhancement of the Fenton-like photocatalytic response of feroxyhyte nanoflake/carbon nanodot nanohybrids was reported. 13) Polyakov et al. synthesized anisotropic feroxyhyte nanoparticles in the presence of humic substances. 14)Recently, we synthesized extremely small spherical feroxyhyte nanoparticles stabilized with gela- Fig. 1 (a) X-ray diffraction pattern, (b) TEM image, (c) histogram of diameters and (d) HR-TEM image of the feroxyhyte nanoparticles.

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“…48,49 Similarly, the ablation of iron targets in various organic solvents led to iron-based nanoparticles including iron carbide (Fe 3 C), iron oxides, amorphous and crystalline iron. 50,51 The fast cooling (a few microseconds) of the plasma mixed with solvent vaporised molecules leads to the nucleation and growth of nanoparticles with size ranging from few nanometers to a few tens of nanometers. Their composition can combine species from the ablated target and the solvent.…”

Section: Introductionmentioning

confidence: 99%