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Vers la compréhension et le contrôle du démouillage des couches d'argent

Abstract : Silver thin films are widely used in the glass industry for their insulation properties. Their stability is crucial. This work focus on silver solid-state dewetting (i.e. agglomeration) on amorphous silica substrates, divided into two axes: understanding the mechanisms thanks to in situ experiments and controlling the dewetting thanks to the patterning of the substrate at the nanoscale. The various in situ microscopy techniques revealed the role of specific grains in the dewetting mechanism. Dewetting proceeds into three steps: induction, propagation and sintering. Throughout these steps, the grains that eventually give birth to particles are identified, even as early as induction. Dewetting is strongly impacted by the oxygen content of the annealing atmosphere. When present, oxygen promotes the growth of very specific grains, where all dewetted material agglomerates. Without oxygen, silver is distributed on a larger number of grains, surrounding the holes that take a dendritic shape. A cautious image processing procedure allowed us to conclude that the capillary models usually invoked were not suitable for our system. A new model, based on the role of individual grains, is suggested. Dewetting on patterned substrates is a way to produce large arrays of organised nanoparticles. A method was developed to minimize in these arrays the number of defects inherent to dewetting. Optical measurements on such arrays showed that the spatial organisation of the particles led to a specific signature in optical absorption.
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  • HAL Id : tel-01898423, version 1

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Paul Jacquet. Vers la compréhension et le contrôle du démouillage des couches d'argent. Chimie-Physique [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066552⟩. ⟨tel-01898423⟩

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