Home page > Research > Surface functionalization and nanostructures

Dewetting of silver layer

by Teisseire Jérémie - published on

PhD P. Jacquet (2014-2017), J. Teisseire, I. Gozhyk

Thin silver layers on silica are metastable systems. They undergo dramatic transformations upon annealing, leading eventually to an aggregation into nanoparticles. Due to striking similitudes with liquid dewetting and because this aggregation occurs at temperatures far below melting point of silver, this phenomenon is known as “solid state dewetting”.

Our study of silver dewetting is divided into two axes:

Understand the mechanism:

Many previous works focussed on model systems (Au on Pt, single crystals…), but the comprehension of the morphologies and dynamics in the case of Ag is still poor. Combining different in situ measurements (TEM, SEM, LEED, optics) and modelling, we aim at providing a more accurate description of dewetting. Most of this work will focus on flat substrates.

Control of the dewetting:

The joint laboratory has recently developed an important experience concerning surface patterning with Nano-Imprint. Combining patterning and dewetting allows us to produce large surfaces of localized, organized and shaped Ag nanoparticles. Further work will explore the relations between surface pattern modulations and optical response (haze, absorption, diffraction).

Students

  • Fatah Maloum (2013)
  • Arthur Le Bris (PostDoc 2012-2013)

Collaborations

  • Rémi Lazzari, Jacques Jupille (INSP - Paris)
  • Fabien Sorin (FIMAP - EPFL)