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2013-11-08 - Colloque/Présentation - communication orale - Anglais - 22 page(s)

Aparicio Rebollo Francisco , Thiry Damien , Priya Laha, Britun Mikola , Snyders Rony , "Effect of Deposition Temperature on the Composition and Properties of Propanethiol Plasma Polymer Thin Films" in Workshop on Fundamentals of plasma-surface interactions, Antwerp, Belgium, 2013

  • 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) Synthesis of high refractive index (n > 1.65) polymeric films is a topic of interest for the implementation in advanced photonic devices.1,2 Due to their high molar refractions, the chemical polymerization of sulfur containing monomers is one of the approaches successfully used for the development of high refractive index material.1 In this regards, the present work investigates the solvent-less synthesis of highly-sulfur-concentrated organic thin films by the plasma polymerization of Propanethiol. The films were deposited in a radio frequency inductively coupled plasma reactor that can be operated in two different regimes denominated capacitive (E) and inductive (H) modes. Our first results revealed that the atomic sulfur concentration varies within a wide range (15-40 %) depending of the plasma mode.3 Further mass spectra analyses suggest that such high concentration may be accounted by the preferential incorporation of sulfur based moieties. As a main novelty this work shows that this trapping process depends on the substrate temperature which in case H mode is strongly affected by the physicochemical processes at the growing-film/plasma interface. Experiments conducted at controlled temperature, with the help of an external cooling circuit, confirm both the proposed trapping scenario and the role of the substrate temperature on the synthesis of plasma polymeric films with high sulfur content. The acquired control enables to develop optical thin film with a controllable refractive index, from 1.69 to 1.82, being the latter one of the highest refractive index ever reported in organic materials. (1) Liu, J.-g.; Ueda, M. Journal of Materials Chemistry 2009, 19, 8907-8919. (2) Aparicio, F. J.; Holgado, M.; Borras, A.; Blaszczyk-Lezak, I.; Griol, A.; Barrios, C. A.; Casquel, R.; Sanza, F. J.; Sohlström, H.; Antelius, M.; González-Elipe, A. R.; Barranco, A. Advanced Materials 2011, 23, 761-765. (3) Thiry, D.; Britun, N.; Konstantinidis, S.; Dauchot, J.-P.; Guillaume, M.; Cornil, J.; Snyders, R. The Journal of Physical Chemistry C 2013, 117, 9843-9851.