Dewetting induced Au-Ge composite nanodot evolution in SiO2

Datta, D.P.; Chettah, A.; Siva, V.; Kanjilal, D.; Sahoo, Pratap K.

doi:10.1016/j.apsusc.2017.09.176

Cited by 7 publications

(9 citation statements)

References 52 publications

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“…In fact, this model can be applied to account for the synergy between the elastic and inelastic thermal spikes. Recently it has been extended to multilayer systems 28 . More details are found in the previous paper 28 for Au/Ge system irradiated with the same energy as in the present system (500 keV Xe ions).…”

Section: Resultsmentioning

confidence: 99%

“…Recently it has been extended to multilayer systems 28 . More details are found in the previous paper 28 for Au/Ge system irradiated with the same energy as in the present system (500 keV Xe ions). The main hypotheses in this model are:Both electronic and nuclear energy losses contribute to the target heating process along the ion path as described in the following set of coupled heat diffusion Eqs (1) and (2) for electronic and atomic subsystems, respectively 30,31 :where C e,a , T e,a , and K e,a are the specific heat, temperature, and thermal conductivity of the electronic and atomic subsystems.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, ion irradiation technique couples the nanostructure evolution due to dewetting with ion induced mixing and sputtering, opening up a promising route towards single step self-organized synthesis of composite nanodots on materials surface 25–28 . In our studies, we have shown that ion-irradiation effectively transforms a Au-Si or Au-Ge bilayer to a nanoparticle array on SiO 2 surface 25–28 . The initial stage of the evolution triggered by the ion irradiation was related to ion-induced dewetting of the metal layer accompanied by sputtering and mixing.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

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“…However, the high melting temperatures of most metals are not easily achievable using conventional heating methods. Therefore, the dewetting process is generally performed using high-energy sources such as focused ion beams and lasers [23].…”

Section: Introductionmentioning

confidence: 99%

Antifungal Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

Lin

Wang

et al. 2020

Applied Sciences

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Silver particles were prepared by dewetting Ag films coated on glass using a fiber laser. The size of the particles was controlled in the range of 92 nm–1.2 μm by adjusting the thickness of the Ag film. The structural properties and surface roughness of the particles were evaluated by means of scanning electron microscopy. In addition, the antifungal activity of the Ag particles was examined using spore suspensions of Colletotrichum gloeosporioides. It is shown that particles with a size of 1.2 μm achieved 100% inhibition of conidia growth of C. gloeosporioides after a contact time of just 5 min. Furthermore, the smaller particles also achieved good antifungal activity given a longer contact time. Similar results were observed for spore germination and pathogenicity tests performed on mango fruit and leaves. Overall, the results confirm that Ag particles have an excellent antifungal effect on C. gloeosporioides.

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“…However, t h e high melting temperatures of most metals are not easily achievable using conventional heating methods. Therefore, the dewetting process is generally performed using high-energy sources such as focused ion beams and lasers [ 23] .…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

Wang¹,

Wang²,

Lin³

et al. 2020

Preprint

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Silver particles are prepared by dewetting Ag ﬁlms coated on glass using a fiber laser. The size of the particles is controlled in the range of 92 nm ~ 1.2 μm by adjusting the thickness of the Ag film. The structural properties and surface roughness of the particles are evaluated by means of scanning electron microscopy. In addition, the antifungal activity of the Ag particles is examined using spore suspensions of Colletotrichum gloeosporioides. It is shown that the particles with a size of 1.2 μm achieve 100% inhibition of the conidia growth of the Colletotrichum gloeosporioides after a contact time of just 5 min. Furthermore, the smaller particles also achieve a good antibacterial activity given a longer contact time. Similar results are observed in spore germination and pathogenicity tests performed on mango fruit and leaves. Overall, the results confirm that the Ag particles have an excellent antifungal effect on Colletotrichum gloeosporioides.

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Dewetting induced Au-Ge composite nanodot evolution in SiO2

Cited by 7 publications

References 52 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

Antifungal Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

Antibacterial Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

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