On the evolution of the steady state in gold-silica nanocomposites under sustained irradiation

Vu, Thi Hai Yen; Ramjauny, Y.; Hayoun, Marc; Rizza, Giancarlo; Perruchas, Sandrine

doi:10.1063/1.4919019

Cited by 7 publications

(3 citation statements)

References 51 publications

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“…Recently Vu et al . has shown 53 for 4 MeV Au-ion irradiation of 4 nm Au nanoparticles in SiO 2 at 300 K that diffusion of solutes is larger than thermal diffusion and smaller nanoparticles may nucleate and grow under ion irradiation. In the present study, Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet and Infrared luminescent Au-rich nanostructure growth in SiO2 by burrowing and inverse Oswald ripening process

Datta

Chettah

Maiti

et al. 2019

Sci Rep

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We study the evolution of nanoparticle morphology through successive stages when Au-Si bilayer on SiO2 is irradiated with 500 keV Xe-ions and resulting luminescence in the UV, Visible and infrared range. An array of nanoscale island morphology is developed on the silica surface in the initial stage of evolution which undergoes gradual burrowing in the silica matrix accompanied by elongation of large ones in the direction of incident ions under cumulative ion irradiation. Burrowing is found to occur in order to minimize the surface free energy of the nanoparticles. Numerical simulation based on the unified thermal spike model shows formation of molten latent tracks due to ions energy release which drive the dewetting of the metal layer and further give mobility to nanoparticle atoms leading to burrowing in the later stage of evolution and elongation of large nanoparticles. Satellite nanoparticles are observed to grow around Au nanoparticles embedded in silica through nucleation of Au atoms dissolved in the matrix by incident ions. The varying diameters of the Au satellite nanoparticles seem to result in luminescence in the UV and infrared range. The observed structure may find application in surface enhanced Raman scattering, catalysis, and LEDs.

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Section: Resultsmentioning

confidence: 99%

Ultraviolet and Infrared luminescent Au-rich nanostructure growth in SiO2 by burrowing and inverse Oswald ripening process

Datta

Chettah

Maiti

et al. 2019

Sci Rep

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“…This result means that for a critical temperature, an intermediate behaviour should exist that consists of an apparent stability of the nano-oxides. The apparent stability [33] refers to a regime under which the nano-oxides undergo the ballistic ejection of their constituting atoms but, owing to diffusion, the ejected atom back-diffuses toward its original particle or diffuses toward another particle, where it replaces another constituting atom that had previously been ejected. It can be resumed as a regime where the atomic ejection flux and the atomic arrival flux compensate each other, giving an impression of stability.…”

Section: Damage Dose (Dpa)mentioning

confidence: 99%

Nano-Structured Materials under Irradiation: Oxide Dispersion-Strengthened Steels

et al. 2021

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Oxide dispersion-strengthened materials are reinforced by a (Y, Ti, O) nano-oxide dispersion and thus can be considered as nanostructured materials. In this alloy, most of the nanoprecipitates are (Y, Ti, O) nano-oxides exhibiting a Y2Ti2O7 pyrochlore-like structure. However, the lattice structure of the smallest oxides is difficult to determine, but it is likely to be close to the atomic structure of the host matrix. Designed to serve in extreme environments—i.e., a nuclear power plant—the challenge for ODS steels is to preserve the nano-oxide dispersion under irradiation in order to maintain the excellent creep properties of the alloy in the reactor. Under irradiation, the nano-oxides exhibit different behaviour as a function of the temperature. At low temperature, the nano-oxides tend to dissolve owing to the frequent ballistic ejection of the solute atoms. At medium temperature, the thermal diffusion balances the ballistic dissolution, and the nano-oxides display an apparent stability. At high temperature, the nano-oxides start to coarsen, resulting in an increase in their size and a decrease in their number density. If the small nano-oxides coarsen through a radiation-enhanced Ostwald ripening mechanism, some large oxides disappear to the benefit of the small ones through a radiation-induced inverse Ostwald ripening. In conclusion, it is suggested that, under irradiation, the nano-oxide dispersion prevails over dislocations, grain boundaries and free surfaces to remove the point defects created by irradiation.

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“…For a recent review of precipitation modelling by AKMC approaches see (Becquart and Soisson 2018). Note that a few studies have also been dedicated to investigate the stability of nanoparticles under irradiation and characterize their dissolution (Vu et al 2015) (Vu et al 2016).…”

Section: Iv-2 Precipitation Segregation and Phase Transformationsmentioning

confidence: 99%

Kinetic Monte Carlo Simulations of Irradiation Effects

Becquart

Mousseau

Domain

2020

Comprehensive Nuclear Materials

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On the evolution of the steady state in gold-silica nanocomposites under sustained irradiation

Cited by 7 publications

References 51 publications

Ultraviolet and Infrared luminescent Au-rich nanostructure growth in SiO2 by burrowing and inverse Oswald ripening process

Ultraviolet and Infrared luminescent Au-rich nanostructure growth in SiO2 by burrowing and inverse Oswald ripening process

Nano-Structured Materials under Irradiation: Oxide Dispersion-Strengthened Steels

Kinetic Monte Carlo Simulations of Irradiation Effects

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