Self-Detachment and Subsurface Densification of Dealloyed Nanoporous Thin Films.

ABSTRACT: 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 considera

SUBMITTER: Henkelmann G 

PROVIDER: S-EPMC9413411 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature