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Formation and morphological evolution of self-similar 3D nanostructures on weakly interacting substrates
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-0908-7187
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Nanoscale engineering. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Univ Illinois, IL 61801 USA; Univ Illinois, IL 61801 USA.
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2018 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 2, no 6, article id 063401Article in journal (Refereed) Published
Abstract [en]

Vapor condensation on weakly interacting substrates leads to the formation of three-dimensional (3D) nanoscale islands (i.e., nanostructures). While it is widely accepted that this process is driven by minimization of the total film/substrate surface and interface energy, current film-growth theory cannot fully explain the atomic-scale mechanisms and pathways by which 3D island formation and morphological evolution occurs. Here, we use kinetic Monte Carlo simulations to describe the dynamic evolution of single-island shapes during deposition of Ag on weakly interacting substrates. The results show that 3D island shapes evolve in a self-similar manner, exhibiting a constant height-to-radius aspect ratio, which is a function of the growth temperature. Furthermore, our results reveal the following chain of atomic-scale events that lead to compact 3D island shapes: 3D nuclei are first formed due to facile adatom ascent at single-layer island steps, followed by the development of sidewall facets bounding the islands, which in turn facilitates upward diffusion from the base to the top of the islands. The limiting atomic process which determines the island height, for a given number of deposited atoms, is the temperature-dependent rate at which adatoms cross from sidewall facets to the island top. The overall findings of this study provide insights into the directed growth of metal nanostructures with controlled shapes on weakly interacting substrates, including two-dimensional crystals, for use in catalytic and nanoelectronic applications.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 2, no 6, article id 063401
National Category
Condensed Matter Physics
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URN: urn:nbn:se:liu:diva-149345DOI: 10.1103/PhysRevMaterials.2.063401ISI: 000435337300001OAI: oai:DiVA.org:liu-149345DiVA, id: diva2:1229834
Note

Funding Agencies|Linkoping University [Dnr-LiU-2015-01510]; Swedish Research Council [VR-2011-5312, VR-2015-04630, VR2014-5790]; Knut and AliceWallenberg Foundation [KAW2011-0094]

Available from: 2018-07-02 Created: 2018-07-02 Last updated: 2018-08-02

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Lü, BoAlmyras, GeorgiosGervilla Palomar, VictorGreene, Joseph ESarakinos, Kostas
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