The effect of laser energy on the preparation of iron oxide by a pulsed laser ablation in ethanol

AbstractNanoparticles of iron oxide were prepared by pulsed laser ablation on carbon coated mica substrates. An ArF excimer laser was used to irradiate a Fe2O3 target in atmospheres of Ar at room temperature. The effects of ambient pressure on size and morphology of nanoparticles were investigated using transmission electron microscopy. The morphology of the deposited nanoparticles was strongly dependent on the ablation pressure. The formations of nanoparticles and their aggregates were observed at pressures higher than 46.7 Pa and 267 Pa of Ar, respectively. The size of the primary nanoparticles ranged from 2 – 9 nm and their size distribution agreed with a log-normal distribution function. The aggregate size increased with ambient pressure and the primary particle size was independent of ambient pressure.

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Fabrication of Dispersed Permalloy Nanoparticles by Pulsed Laser Ablation in Aqua

MRS Proceedings ◽

10.1557/proc-1118-k02-08 ◽

2008 ◽

Vol 1118 ◽

Author(s):

Ruqiang Bao ◽

Zijie Yan ◽

Yong Huang ◽

Douglas B. Chrisey

Keyword(s):

Laser Ablation ◽

Sodium Dodecyl Sulfate ◽

Aqueous Solutions ◽

Laser Energy ◽

Sodium Dodecyl ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Distilled Water ◽

Pure Ethanol ◽

Made In

ABSTRACTPermalloy (Ni81Fe19) nanoparticles with diameters of hundreds of nanometers have been successfully fabricated by pulsed laser ablation (PLA) in air, distilled water, pure ethanol and sodium dodecyl sulfate (SDS) aqueous solutions. The permalloy nanoparticles made in SDS solutions are typically spherical in shape. Lower laser energy with lower frequency leads to the formation of smaller permalloy nanoparticles. Higher concentration of SDS results in smaller nanoparticles. Lastly, we found some unusual permalloy nanoparticles with interesting morphologies made by PLA in air, distilled water and ethanol.

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Molecular Dynamics Simulation of the Ablation Process in Ultrashort Pulsed Laser Machining of Polycrystalline Diamond

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.500.351 ◽

2012 ◽

Vol 500 ◽

pp. 351-356 ◽

Cited By ~ 3

Author(s):

Zeng Qiang Li ◽

Jun Wang ◽

Qi Wu

Keyword(s):

Molecular Dynamics ◽

Laser Ablation ◽

Molecular Dynamics Simulation ◽

Grain Boundaries ◽

Laser Energy ◽

Pulsed Laser ◽

Polycrystalline Diamond ◽

Pulsed Laser Ablation ◽

Dynamics Simulation ◽

Ultrashort Pulsed Laser

The mechanism of ultrashort pulsed laser ablation of polycrystalline diamond (PCD) is investigated using molecular dynamics simulation. The simulation model provides a detailed atomic-level description of the laser energy deposition to PCD specimens and is verified by an experiment using 300 fs laser irradiation of a PCD sample. It is found that grain boundaries play an important role in the laser ablation. Melting starts from the grain boundaries since the atoms in these regions have higher potential energy and are melted more easily than the perfect diamond. Non-homogeneous melting then takes place at these places, and the inner crystal grains melt more easily in liquid surroundings presented by the melting grain boundaries. Moreover, the interplay of the two processes, photomechanical spallation and evaporation, are found to account for material removal in ultrashort pulsed laser ablation of PCD.

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Synthesis and Properties of Platinum Nanoparticles by Pulsed Laser Ablation in Liquid

Journal of Nanomaterials ◽

10.1155/2016/9651637 ◽

2016 ◽

Vol 2016 ◽

pp. 1-11 ◽

Cited By ~ 15

Author(s):

Maria Isabel Mendivil Palma ◽

Bindu Krishnan ◽

Guadalupe Alan Castillo Rodriguez ◽

Tushar Kanti Das Roy ◽

David Avellaneda Avellaneda ◽

...

Keyword(s):

Laser Ablation ◽

Photoelectron Spectroscopy ◽

Laser Energy ◽

Pulsed Laser ◽

Pt Nanoparticles ◽

Pulsed Laser Ablation ◽

Laser Ablation In Liquid ◽

Visible Absorption ◽

Energy Fluence ◽

Ablation Time

Platinum (Pt) nanoparticles were synthesized by pulsed laser ablation in liquid (PLAL) technique in different liquids (acetone, ethanol, and methanol). Ablation was performed using a Q-switched Nd:YAG laser with output energy of 230 mJ/pulse for 532 nm wavelength. Ablation time and laser energy fluence were varied for all the liquids. Effects of laser energy fluence, ablation time, and nature of the liquid were reported. The mean size, size distributions, shape, elemental composition, and optical properties of Pt nanoparticles synthesized by PLAL were examined by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-Visible absorption spectroscopy.

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Effect of laser energy on the SPR and size of silver nanoparticles synthesized by pulsed laser ablation in distilled water

10.1063/1.5028667 ◽

2018 ◽

Cited By ~ 3

Author(s):

Prahlad K. Baruah ◽

Ashwini K. Sharma ◽

Alika Khare

Keyword(s):

Silver Nanoparticles ◽

Laser Ablation ◽

Laser Energy ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Distilled Water

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Synthesis of Iron Oxide Nanostructures via Carbothermal Reaction of Fe Microspheres Generated by Infrared Pulsed Laser Ablation

Coatings ◽

10.3390/coatings9030179 ◽

2019 ◽

Vol 9 (3) ◽

pp. 179 ◽

Cited By ~ 3

Author(s):

Jeffrey De Vero ◽

Alladin Jasmin ◽

Lean Dasallas ◽

Wilson Garcia ◽

Roland Sarmago

Keyword(s):

Iron Oxide ◽

Laser Ablation ◽

Self Assembly ◽

Driving Force ◽

Deposition Time ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Compressive Stresses ◽

Oxide Nanostructures ◽

Iron Oxide Nanostructures

Iron oxide nanostructures were synthesized using the carbothermal reaction of Fe microspheres generated by infrared pulsed laser ablation. The Fe microspheres were successfully deposited on Si(100) substrates by laser ablation of the Fe metal target using Nd:YAG pulsed laser operating at λ = 1064 nm. By varying the deposition time (number of pulses), Fe microspheres can be prepared with sizes ranging from 400 nm to 10 µm. Carbothermal reaction of these microspheres at high temperatures results in the self-assembly of iron oxide nanostructures, which grow radially outward from the Fe surface. Nanoflakes appear to grow on small Fe microspheres, whereas nanowires with lengths up to 4.0 μm formed on the large Fe microspheres. Composition analyses indicate that the Fe microspheres were covered with an Fe3O4 thin layer, which converted into Fe2O3 nanowires under carbothermal reactions. The apparent radial or outward growth of Fe2O3 nanowires was attributed to the compressive stresses generated across the Fe/Fe3O4/Fe2O3 interfaces during the carbothermal heat treatment, which provides the chemical driving force for Fe diffusion. Based on these results, plausible thermodynamic and kinetic considerations of the driving force for the growth of Fe2O3 nanostructures were discussed.

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