The Irradiation Effect of a Simultaneous Laser and Electron Dual-beam on Void Formation

Yang, Zhou; Watanabe, Seiichi; Kato, Takahiko

doi:10.1038/srep01201

Cited by 9 publications

(11 citation statements)

References 31 publications

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“…To allow for a sufficient volume of liquid to assist the chemical reaction while using a conventional microscopy method with high resolution, we combined HVEM with a laser irradiation system [16][17][18] inside a TEM chamber (Fig. 1).…”

confidence: 99%

In situ direct observation of photocorrosion in ZnO crystals in ionic liquid using a laser-equipped high-voltage electron microscope

et al. 2017

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ZnO photocatalysts in water react with environmental water molecules and corrode under illumination. ZnO nanorods in water can also grow because of water splitting induced by UV irradiation. To investigate their morphological behavior caused by crystal growth and corrosion, here we developed a new laser-equipped high-voltage electron microscope and observed crystal ZnO nanorods immersed in ionic liquid. Exposing the specimen holder to a laser with a wavelength of 325 nm, we observed the photocorrosion in situ at the atomic scale for the first time. This experiment revealed that Zn and O atoms near the interface between the ZnO nanorods and the ionic liquid tended to dissolve into the liquid. The polarity and facet of the nanorods were strongly related to photocorrosion and crystal growth.

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confidence: 99%

In situ direct observation of photocorrosion in ZnO crystals in ionic liquid using a laser-equipped high-voltage electron microscope

et al. 2017

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“…These studies have provided tremendous insight into bypass mechanisms at the atomic scale, such as glide [3], climb [4], and inertial effects [7]. However, void sizes directly accessible to MD are typically in the range of 1-6 nm, whereas corresponding void sizes found in crystalline materials commonly range from tens of nanometers to microns [9][10][11][12][13]. Furthermore, MD, due to its limitations in the size of the computational domain, can frequently only be applied to modeling a single void in a periodic array of voids.…”

Section: Introductionmentioning

confidence: 99%

“…Such an idealized arrangement of voids is unlikely to provide a statistically representative characterization of plasticity in crystals with porosity. Finally, temporal scales characteristic to MD require strain rates on the order of 10 6 -10 9 1/s, well outside of the range encountered in typical applications.…”

Section: Introductionmentioning

confidence: 99%

Capturing the effects of free surfaces on void strengthening with dislocation dynamics

2015

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a b s t r a c tVoid strengthening in crystalline materials refers to the increase in yield stress due to the impediment of dislocation motion by voids. Dislocation dynamics (DD) is a modeling method well suited to capture the physics, length scales, and time scales associated with void strengthening. However, previous DD simulation of dislocation-void interactions have been unable to accurately account for the strong image forces acting on the dislocation due to the void's free surface. In this article, we employ a finite-element-based DD method to determine the obstacle strength of voids, defined as the critical resolved shear stress for a dislocation to glide past an array of voids. Our results demonstrate that the attractive image forces between the dislocation and free surface significantly reduce the obstacle strength of voids. Effects of surface mobility and stress concentrations around the void are also explored and are shown to have minimal effect on the critical stress. Finally, a new model relating void size and spacing to obstacle strength is proposed.

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“…Quantum beam co-irradiation studies using a heavy ion beam and nanosecond-pulsed laser beam [32][33][34][35][36][37] or an electron beam and nanosecond-pulsed laser beam 38,39 have also been reported. Intense heavy ion beams and high-energy laser systems are used to study the beam-plasma interactions of matter with high energy density in plasma physics and fusion research.…”

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confidence: 99%

Effects of ion and nanosecond-pulsed laser co-irradiation on the surface nanostructure of Au thin films on SiO2 glass substrates

Shibayama

Meng

et al. 2014

Journal of Applied Physics

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Ion irradiation synthesis of Ag-Au bimetallic nanospheroids in SiO2 glass substrate with tunable surface plasmon resonance frequency J. Appl. Phys. 114, 054308 (2013) Ion irradiation and short-pulsed laser irradiation can be used to form nanostructures on the surfaces of substrates. This work investigates the synergistic effects of ion and nanosecond-pulsed laser co-irradiation on surface nanostructuring of Au thin films deposited under vacuum on SiO 2 glass substrates. Gold nanoparticles are randomly formed on the surface of the substrate after nanosecond-pulsed laser irradiation under vacuum at a wavelength of 532 nm with a repetition rate of 10 Hz and laser energy density of 0.124 kJ/m 2 . Gold nanoparticles are also randomly formed on the substrate after 100-keV Ar þ ion irradiation at doses of up to 3.8 Â 10 15 ions/cm 2 , and nearly all of these nanoparticles are fully embedded in the substrate. With increasing ion irradiation dose (number of incident laser pulses), the mean diameter of the Au nanoparticles decreases (increases). However, Au nanoparticles are only formed in a periodic surface arrangement after co-irradiation with 6000 laser pulses and 3.8 Â 10 15 ions/cm 2 . The periodic distance is $540 nm, which is close to the wavelength of the nanosecond-pulsed laser, and the mean diameter of the Au nanoparticles remains at $20 nm with a relatively narrow distribution. The photoabsorption peaks of the ion-or nanosecond-pulsed laser-irradiated samples clearly correspond to the mean diameter of Au nanoparticles. Conversely, the photoabsorption peaks for the co-irradiated samples do not depend on the mean nanoparticle diameter. This lack of dependence is likely caused by the periodic nanostructure formed on the surface by the synergistic effects of co-irradiation. V C 2014 AIP Publishing LLC.

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The Irradiation Effect of a Simultaneous Laser and Electron Dual-beam on Void Formation

Cited by 9 publications

References 31 publications

In situ direct observation of photocorrosion in ZnO crystals in ionic liquid using a laser-equipped high-voltage electron microscope

In situ direct observation of photocorrosion in ZnO crystals in ionic liquid using a laser-equipped high-voltage electron microscope

Capturing the effects of free surfaces on void strengthening with dislocation dynamics

Effects of ion and nanosecond-pulsed laser co-irradiation on the surface nanostructure of Au thin films on SiO2 glass substrates

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