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2019-09-26 - Colloque/Présentation - communication orale - Anglais - page(s)

Vinx Nathan , Damman Pascal , Moerman David , Leclère Philippe , Cossement Damien, Satriano Cristina, Snyders Rony , Thiry Damien , "An innovative approach for micro/nano structuring plasma polymer films" in Plathinium 2019, Antibes, France, 2019

  • Codes CREF : Chimie des surfaces et des interfaces (DI1327)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) Plasma polymerization has become a well-established technique for the synthesis of solid organic thin films referred as plasma polymer films (PPF). Nowadays, despite a highly complex growth mechanism, it is possible to finely control the chemical composition of the PPF by a clever choice of the process parameters. On the other hand, tailoring their morphology at the micro/nano scale is much more challenging [1] limiting further development in the field. In this context, in this work, an innovative strategy allowing the control of both the chemical composition and the architecture of PPF is established. The proposed method is based on the controlled generation of surface instabilities in bilayer systems formed by a mechanically responsive PPF and a stiffer thin film. As a case study, propanethiol is used as a precursor. The mechanical properties of PPF playing a key role in the deformation mechanism are controlled varying the substrate temperature (Ts). It has been shown by means of different AFM-based methods (i.e. approach-retract curves, scratching experiments) that the nature of the PPF is dramatically affected by the thermal conditions of the substrate: from a high viscous liquid (η ~ 106 Pa.s.) to a viscoelastic (E ~ 0,1 GPa) and finally to a stiffer elastic solid (E ~ 0,9 GPa) material when increasing Ts from 10°C to 45°C. This evolution in the mechanical properties is correlated with a pronounced increase in the cross-linking degree of PPF evaluated by ToF-SIMS measurements, combined with a statistical treatment of the data.[2] In a second part, taking advantage of the ability to easily modulate the mechanical properties of PPF and in view of inducing a morphological reorganization, a stiffer thin film (i.e. Al or another PPF) is deposited on the top of a mechanically responsive PPF. It has been shown that using this strategy, various patterns with tuneable dimensions (from the nano to the micrometer range) and shapes (beads, wrinkles) can be formed by tuning the mechanical properties of both layers involved in the multilayer system.[3] Finally, for applicative purpose, it has been demonstrated that the cell attachment behaviour and proliferation on the structured PPF surfaces can be finely tailored varying the dimensions and shapes of the nano/micro objects. [1] O. Kylián et al, Thin Solid Films, 2013, 548, 1-17. [2] D. Cossement et al., App. Surf. Sci., 2015, 355, 842-848. [3] D. Thiry et al., Thin Solid Films, 2019, 672, 26-32.