Synthesis of Spherical ZnO Microcrystals by Laser Ablation in Air

Nakamura, Daisuke; Tanaka, Toshinobu; Ikebuchi, Tatsuya; Ueyama, Toshihiko; Higashihata, Mitsuhiro; Okada, Tatsuo

doi:10.1002/ecj.11874

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…The iridate nanoparticles are spheroidal with an apparent tendency to increase its particle density with increasing laser fluence [40]. The formation of large ZnO microspheres (sizes of more than 30 μm) was successfully synthesized using very high laser fluences up to 440 J/cm 2 (which is 10 3 higher than conventional laser density used in PLD) [41]. However, undesired severe target fragmentation was observed at this range of laser fluence.…”

Section: Resultsmentioning

confidence: 99%

“…Whereas, shorter wavelengths offer a higher photon energy, which is more suitable for efficient vaporization and ionization of the solid sample, resulting in atomized material delivery on a nearby substrate [12,33]. In particular, we reported UV pulsed laser ablation of iridate targets showing iridate nanoparticles (average size~50 nm) on unheated MgO single crystal substrates [41]. The iridate nanoparticles are spheroidal with an apparent tendency to increase its particle density with increasing laser fluence [40].…”

Section: Resultsmentioning

confidence: 99%

“…In particular, we reported UV pulsed laser ablation of iridate targets showing iridate nanoparticles (average size ~50 nm) on unheated MgO single crystal substrates [41]. The iridate nanoparticles are spheroidal with an apparent tendency to increase its particle density with increasing laser fluence [40].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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“…One consequence of the size-shape dependence and the resulting CSD bias is that the lateral beam profile deconvolutions could not be reliably checked by comparing the deconvoluted intensity CSD with the SEM-derived volume CSD (see x3.5.2 and xS2.2). Interesting materials that could provide a better reference are, for example, single-crystalline microspheres (Nakamura et al, 2016;Shimogaki et al, 2014;Tasaki et al, 2018;Yang et al, 2008) or idiomorphic single crystals with shapes easily measured with SEM imagery (Pieniążek et al, 2016;Chen et al, 2011).…”

Section: Reference Materialsmentioning

confidence: 99%

A fast X-ray-diffraction-based method for the determination of crystal size distributions (FXD-CSD)

2018

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A procedure for a fast X-ray-diffraction-based crystal size distribution analysis, named FXD-CSD, is presented. The method enables the user, with minimal sample preparation, to determine the crystal size distribution (CSD) of crystalline powders or polycrystalline materials, derived via an intensity scaling procedure from the diffraction intensities of single Bragg spots measured in spotty diffraction patterns with a two-dimensional detector. The method can be implemented on any single-crystal laboratory diffractometer and any synchrotron-based instrument with a fast-readout two-dimensional detector and a precise sample scanning axis. The intensity scaling is achieved via the measurement of a reference sample with known CSD under identical conditions; the only other prerequisite is that the structure (factors) of both sample and reference material must be known. The data analysis is done with a software package written in Python. A detailed account is given of each step of the procedure, including the measurement strategy and the demands on the spottiness of the diffraction rings, the data reduction and the intensity corrections needed, and the data evaluation and the requirements for the reference material. Using commercial laboratory X-ray equipment, several corundum crystal size fractions with precisely known CSD were measured and analysed to verify the accuracy and precision of the FXD-CSD method; a comparison of known and deduced CSDs shows good agreement both in mean size and in the shape of the size distribution. For the used material and diffractometer setup, the crystal size application range is one to several tens of micrometres; this range is highly material and X-ray source dependent and can easily be extended on synchrotron sources to cover the range from below 0.5 mm to over 100 mm. FXD-CSD has the potential to become a generally applicable method for CSD determination in the field of materials science and pharmaceutics, including development and quality management, as well as in various areas of fundamental research in physics, chemistry, chemical engineering, crystallography, the geological sciences and bio-crystallization. It can be used also under in situ conditions for studying crystal coarsening phenomena, and delivers precise and accurate CSDs, permitting experimental tests of various theories developed to predict their evolution.

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“…However, transparent microparticles require light injection from outside by evanescent coupling using an angle polished fiber 4 . In our research, we have successfully fabricated semiconductor microparticles by a simple laser ablation method in air [5][6][7][8] , and have demonstrated ultraviolet WGM lasing from photo-excited single ZnO microparticles without light injection.…”

mentioning

confidence: 99%

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

Nakamura

Tasaki

Kawamoto

et al. 2020

Sci Rep

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We demonstrate a radiation hydrodynamic simulation of optical vortex pulse-ablated microcone structures on silicon (Si) substrates. Doughnut-shaped craters were formed by single pulse irradiation on the Si substrate, and a twisted cone structure with a height of 3.5 µm was created at the center of the irradiation spot by the circularly polarized optical vortex pulse. A two-dimensional (2-D) radiation hydrodynamic simulation reproduced the cone structure well with a height of 3 µm. The central part of the incident laser power was lowered from the initial profile due to plasma shielding over the laser pulse duration for an inverted double-well laser profile. The acute tip shape of the silicon surface can survive over the laser irradiation period.

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Synthesis of Spherical ZnO Microcrystals by Laser Ablation in Air

Cited by 6 publications

References 15 publications

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

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

A fast X-ray-diffraction-based method for the determination of crystal size distributions (FXD-CSD)

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

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