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Self-detachment and subsurface densification of dealloyed nanoporoust thin films
Citation Link: https://doi.org/10.15480/882.4918
Publikationstyp
Journal Article
Date Issued
2022-08-24
Sprache
English
Author(s)
TORE-DOI
Journal
Volume
22
Issue
16
Start Page
6787
End Page
6793
Citation
Nano Letters 22 (16): 6787-6793 (2022-08-24)
Publisher DOI
Scopus ID
PubMed ID
35952308
Publisher
American Chemical Society
Experiment shows thin films of dealloyed nanoporous gold (NPG) spontaneously detaching from massive gold base layers. NPG can also densify near its external surface. This is naturally reproduced by kinetic Monte Carlo (KMC) simulation of dealloying and coarsening and so appears generic for nanoscale network materials evolving by surface diffusion. Near the porous layer's external surface and near its interface with the base layer, gradients in the depth-profile of a laterally averaged mean surface curvature provide driving forces for diffusion and cause divergences of the net fluxes of matter, leading to accretion/densification or to erosion/disconnection. As a toy model, the morphology evolution of substrate-supported nanopillars by surface diffusion illustrates and confirms our considerations. Contrary to cylindrical nanowires, the ligaments in nanoporous materials exhibit pre-existing gradients in the mean curvature. The Plateau-Rayleigh long-wavelength stability criterion is then not applicable and the disconnection accelerated.
Subjects
coarsening
dealloying
nanoporous metals
nanowires
Plateau-Rayleigh instability
surface diffusion
DDC Class
620: Ingenieurwissenschaften
Publication version
publishedVersion
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