Fabrication of Iron Oxide Nanoparticles by Pulsed-Laser Ablation

1998 ◽  
Vol 526 ◽  
Author(s):  
Takeshi Sasaki ◽  
Xiaoyan Zeng ◽  
Naoto Koshizaki
Keyword(s):  
Iron Oxide ◽  
Laser Ablation ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Aggregate Size ◽  
Pulsed Laser Ablation ◽  
Normal Distribution Function ◽  
Carbon Coated ◽  
Size And Morphology ◽  
Log Normal

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.

Spectrum analysis of plasma produced by pulsed laser ablation of GaAs

2007 ◽  
Vol 73 (2) ◽  
pp. 231-239 ◽  
Author(s):  
AI HUA LIU
Keyword(s):  
Laser Ablation ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Emission Spectra ◽  
Diagnostic Technique ◽  
Pulsed Laser Ablation ◽  
Stark Broadening ◽  
Experimental Conditions ◽  
Time Resolved ◽  
Excited Atoms

Abstract.A time-resolved diagnostic technique was used to investigate the emission spectra from the plasmas produced by 1.06 μm, 10 ns pulsed laser ablation of semiconductor GaAs. The characteristics of the species in plasma produced at different ambient pressure were analyzed. The full width at half maximum of the spectral line was measured and analyzed according to obtained spectra of the excited atoms; several line broadening factors were estimated according to our experimental conditions and the results indicate that the Stark broadening is the main broadening mechanism. Under the assumption of local thermodynamic equilibrium, the time evolution of electron number density was deduced from the Stark broadening measurements.

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

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 179 ◽  
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.

Study of iron oxide magnetic nanoparticles obtained via pulsed laser ablation of iron in air

2018 ◽  
Vol 462 ◽  
pp. 226-236 ◽  
Author(s):  
Valery A. Svetlichnyi ◽  
Anastasiia V. Shabalina ◽  
Ivan N. Lapin ◽  
Darya A. Goncharova ◽  
Dmitry A. Velikanov ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Iron Oxide Magnetic Nanoparticles

TEM study of thin iron oxide films deposited by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 780-781
Author(s):  
Ian M. Anderson ◽  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Iron Oxide ◽  
Laser Ablation ◽  
Oxide Films ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Temperature Oxidation ◽  
Hexagonal Close Packed ◽  
Transmission Electron ◽  
Oxygen Sublattices ◽  
Iron Oxide Films

Iron-oxide-based compounds are of technological interest because of their unique magnetic properties. Thin films of these compounds are especially suited to applications such as magnetic recording devices. The binary Fe-O system provides a model for the study of iron-oxide-based compounds, since the multiple valence of the Fe cations permits the formation of phases having a variety of crystal structures. These structures include rock salt (wüstite, Fe1-δO), two spinels (magnetite, Fe3O4 and maghemite, γ-Fe2O3), and corundum (hematite, α-Fe2O3). The former three phases have cubic-close-packed oxygen sublattices, while the latter has a hexagonal-close-packed oxygen sublattice. The γ-Fe2O3 phase is a metastable, cation-deficient spinel, generally formed by careful low-temperature oxidation of the magnetite phase.Thin iron oxide films have been deposited by pulsed-laser ablation onto (001)-oriented MgO single-crystal substrates. The microstructure and epitaxy of these films have been studied using transmission electron microscopy (TEM) and selected-area diffraction (SAD).

Preparation of TiO2Nanoparticles by Pulsed Laser Ablation: Ambient Pressure Dependence of Crystallization

2003 ◽  
Vol 42 (Part 2, No. 5A) ◽  
pp. L479-L481 ◽  
Author(s):  
Masakazu Matsubara ◽  
Tetsuya Yamaki ◽  
Hisayoshi Itoh ◽  
Hiroaki Abe ◽  
Keisuke Asai
Keyword(s):  
Laser Ablation ◽  
Pressure Dependence ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation
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