Magnetic iron oxide nanoparticles with tunable size and free surface obtained via a “green” approach based on laser irradiation in water

Abstract

Crystalline structure, size and surface coating are the relevant parameters influencing the catalytic and magnetic properties of iron oxide nanoparticles (FeOxNPs). The development of a “green” method for the synthesis of FeOxNPs with good crystallinity, controlled size and uncontaminated surface all at the same time is challenging. Here we show that laser ablation in water can be combined with laser irradiation at 355 nm to obtain FeOxNPs with average size tunable in the 10–30 nm range and a percentage of ferrimagnetic phase up to the 94% of crystalline phases, while maintaining the particles surface free from stabilizers or other chemical by-products and without using harmful or toxic reagents. The final FeOxNPs show good magnetization values and have the typical magnetic behaviour of exchange bias systems, due to their highly polycrystalline structure and small (ca. 3 nm) crystalline domains. The one-step coating with phosphonate ligands conferred long time stability in physiological medium to FeOxNPs

Optical and Magnetic Properties of Fe Nanoparticles Fabricated by Femtosecond Laser Ablation in Organic and Inorganic Solvents

“…These results differ from those presented by Amendola et al, [20] who reportedo nly magnetite for nanosecond PLA in water. These results differ from those presented by Amendola et al, [20] who reportedo nly magnetite for nanosecond PLA in water.…”

“…[6,7] The variety of magnetic NP fabrication techniques is quite large, and includes chemical precipitation, [8,9] sol-gel processes, [10,11] and hydrothermal, [12] microemulsion, [13] electrochemical, [14] ands onochemicaltechniques. [16,17] Many authors [18][19][20][21][22][23] have used this approach,a sw ell as with coprecipitation,t os tudy magnetic, optical, and structural properties of colloidal suspensions obtained after nanosecond pulsed laser ablation of Fe targetsi n av ariety of solvents. When pulsed laser ablation is performed on am etal target, different types of NPs may be formed, such as bare metal core, metal core/oxide shell, and hollow metal.…”

“…Particle size could be controlled by meanso ftheP VP concentrationd ue to the capping effect and repulsive interaction of the solvent. Amendola et al [20,21] showed that laser ablationo f an iron target in different organic liquids is as uitable method for obtaining av ariety of magnetic nanostructures, including Magnetic nanoparticles have attractedm uch interest due to their broad applicationsi nb iomedicine and pollutant remediation. Characterization of these NPs provedt hat their morphology consists of ac ore of zero-valent iron surrounded by oxidized species, which prevent further oxidation.…”

Coexistence of plasmonic and magnetic properties in Au89Fe11 nanoalloys

“…A similar result was reported for laser ablation of bulk iron in various solvents such as ethanol and water. [56][57][58] The addition of EDTA and subsequent dialysis were required for selective removal of iron oxides and hydroxides, 56,57 without affecting the phase of alloy AuFeNPs. The TEM images of the PEG-AuFeNP solution indicate that all the iron oxide and amorphous phases were effectively removed by the EDTA and dialysis steps (Fig.…”

High‐Purity Hybrid Organolead Halide Perovskite Nanoparticles Obtained by Pulsed‐Laser Irradiation in Liquid

“…[2,29,35] An excesso fs urfactants and alkylammonium halide is typically required to increaset he solubility of the intermediate metal-halide species. In recent years, PLIL has been successfully exploited to obtain metal, [41][42][43][44][45][46][47] oxide, [48][49][50] semiconductor, [51][52][53][54][55] and hybrid [56][57][58] nanostructures with high purity and controlled size, even at high pressure. [8,29,36] As demonstrated in recent studies, this synthetic approachs ometimes produces am ixture of HyP nanoparticles and nanoplatelets.…”