Surface Diffusion and Coalescence of Mobile Metal Nanoparticles

José–Yacamán, Miguel; Gutiérrez-Wing, C.; Miki, Masaaki; Yang, De‐Quan; Kn, Piyakis; Sacher, E.

doi:10.1021/jp0509459

Cited by 353 publications

(322 citation statements)

References 57 publications

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“…This behaviour confirms that the silver clusters form through cluster migration on the surface and not just by adatom attachment as was assumed in the previous KMC model. Other studies have also confirmed the observed coalescence behaviour 38 . Fig.…”

Section: Molecular Dynamics Simulationssupporting

confidence: 65%

Thermal dynamics of silver clusters grown on rippled silica surfaces

Bhatnagar

Ranjan

Jolley

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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Silver nanoparticles have been deposited on silicon rippled patterned templates at an angle of incidence of 70 • to the surface normal. The templates are produced by oblique incidence argon ion bombardment and as the fluence increases, the periods and heights of the structures increase. Structures with periods of 20 nm, 35 nm and 45 nm have been produced. Moderate temperature vacuum annealing shows the phenomenon of cluster coalescence following the contour of the more exposed faces of the ripple for the case of 35 nm and 45 nm but not at 20 nm where the silver aggregates into larger randomly distributed clusters. In order to understand this effect, the morphological changes of silver nanoparticles deposited on an asymmetric rippled silica surface are investigated through the use of Molecular Dynamics simulations for different deposition angles of incidence between 0 • and 70 • and annealing temperatures between 500K and 900K. Near to normal incidence, clusters are observed to migrate over the entire surface but for deposition at 70 • , a similar patterning is observed as in the experiment. The random distribution of clusters for the periodicity ≈ of 20 nm is linked to the geometry of the silica surface which has a lower ripple height than the longer wavelength structures. Calculations carried out on a surface with such a lower ripple height also demonstrate a similar effect.

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Section: Molecular Dynamics Simulationssupporting

confidence: 65%

Thermal dynamics of silver clusters grown on rippled silica surfaces

Bhatnagar

Ranjan

Jolley

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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“…These findings led to the suggestion that interaction of nanodimensional metal particles at low temperatures resembles coalescence behaviour of soft matter 13,17 and high-temperature sintering of ceramics 18 . Still, all these reports focused on homogeneous NP systems in which interaction of NPs of the same elemental composition was observed [19][20][21][22] .…”

mentioning

confidence: 99%

Merging of metal nanoparticles driven by selective wettability of silver nanostructures

et al. 2014

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The welding and sintering of nanomaterials is relevant, for example, to form electrical contacts between metallic particles in printed electronic devices. Usually the welding of nanoparticles is achieved at high temperatures. Here we find that merging of two different metals, silver and gold nanoparticles, occurs on contact at room temperature. The merging process was investigated by experimental and molecular dynamics simulations. We discovered that the merging of these particles is driven by selective wettability of silver nanoparticles, independent of their size and shape (spheres or rods); silver behaves as a soft matter, whereas gold as a hard surface being wetted and retaining its original morphology. During that process, the silver atoms move towards the surface of the Au nanoparticles and wrap the Au nanoparticles in a pulling up-like process, leading to the wetting of Au nanoparticles.

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“…The second, Ostwald ripening, is when a nanoparticle adheres strongly to a surface, making atomic transfer between nanoparticles more favourable than coalescence. 25 Both of these processes generally follow the von Smoluchowski kinetic rate equation, d f t Àa , where d is the nanoparticle diameter, t is time and a is a constant relating to interfacial adhesion. The processes differ in the magnitude of a, which decreases with increasing particle-substrate interfacial adhesion.…”

Section: Resultsmentioning

confidence: 99%

Containing the catalyst: diameter controlled Ge nanowire growth

et al. 2013

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Sub-20 nm diameter Ge nanowires with narrow size distributions were grown from Ag nanoparticle seeds in a supercritical fluid (SCF) growth process. The mean Ge nanowire diameter and size distribution was shown to be dependent upon Ag nanoparticle coalescence, using both spin-coating and a block copolymer (BCP) templating method for particle deposition. The introduction of a metal assisted etching (MAE) processing step in order to "sink" the Ag seeds into the growth substrate, prior to nanowire growth, was shown to dramatically decrease the mean nanowire diameter from 27.7 to 14.4 nm and to narrow the diameter distributions from 22.2 to 6.8 nm. Hence, our BCP-MAE approach is a viable route for controlling the diameters of semiconductor nanowires whilst also ensuring a narrow size distribution. The MAE step in the process was found to have no detrimental effect on the length or crystalline quality of the Ge nanowires synthesised.

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Surface Diffusion and Coalescence of Mobile Metal Nanoparticles

Cited by 353 publications

References 57 publications

Thermal dynamics of silver clusters grown on rippled silica surfaces

Thermal dynamics of silver clusters grown on rippled silica surfaces

Merging of metal nanoparticles driven by selective wettability of silver nanostructures

Containing the catalyst: diameter controlled Ge nanowire growth

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