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Fracture Mechanics and Oxygen Gas Barrier Properties of Al₂O₃/ZnO Nanolaminates on PET Deposited by Atomic Layer Deposition.

  • Chawla V Mechanics of Materials and Nanostructures Laboratory, Empa- Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland. vipin.phy@gmail.com.
  • Ruoho M Mechanics of Materials and Nanostructures Laboratory, Empa- Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland. mikko.ruoho@empa.ch.
  • Weber M Institut Européen des Membranes, IEM, UMR-5635, Univ Montpellier, CNRS, ENSCM, 4095 Montpellier, France. matthieu.weber@umontpellier.fr.
  • Chaaya AA Institut Européen des Membranes, IEM, UMR-5635, Univ Montpellier, CNRS, ENSCM, 4095 Montpellier, France. adib.a.c@hotmail.com.
  • Taylor AA Materials Department, University of California, Santa Barbara, California 93106, USA. aidantaylor@ucsb.edu.
  • Charmette C Institut Européen des Membranes, IEM, UMR-5635, Univ Montpellier, CNRS, ENSCM, 4095 Montpellier, France. christophe.charmette@umontpellier.fr.
  • Miele P Institut Européen des Membranes, IEM, UMR-5635, Univ Montpellier, CNRS, ENSCM, 4095 Montpellier, France. Philippe.Miele@umontpellier.fr.
  • Bechelany M Institut Européen des Membranes, IEM, UMR-5635, Univ Montpellier, CNRS, ENSCM, 4095 Montpellier, France. mikhael.bechelany@umontpellier.fr.
  • Michler J Mechanics of Materials and Nanostructures Laboratory, Empa- Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland. Johann.Michler@empa.ch.
  • Utke I Mechanics of Materials and Nanostructures Laboratory, Empa- Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland. ivo.utke@empa.ch.
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  • 2019-01-16
Published in:
  • Nanomaterials (Basel, Switzerland). - 2019
Al2O3
ZnO
adhesion
atomic layer deposition
delamination
failure analysis
gas barrier
mechanics
sub-surface growth
tensile strain testing
thin film
English Rapid progress in the performance of organic devices has increased the demand for advances in the technology of thin-film permeation barriers and understanding the failure mechanisms of these material systems. Herein, we report the extensive study of mechanical and gas barrier properties of Al₂O₃/ZnO nanolaminate films prepared on organic substrates by atomic layer deposition (ALD). Nanolaminates of Al₂O₃/ZnO and single compound films of around 250 nm thickness were deposited on polyethylene terephthalate (PET) foils by ALD at 90 °C using trimethylaluminium (TMA) and diethylzinc (DEZ) as precursors and H₂O as the co-reactant. STEM analysis of the nanolaminate structure revealed that steady-state film growth on PET is achieved after about 60 ALD cycles. Uniaxial tensile strain experiments revealed superior fracture and adhesive properties of single ZnO films versus the single Al₂O₃ film, as well as versus their nanolaminates. The superior mechanical performance of ZnO was linked to the absence of a roughly 500 to 900 nm thick sub-surface growth observed for single Al₂O₃ films as well as for the nanolaminates starting with an Al₂O₃ initial layer on PET. In contrast, the gas permeability of the nanolaminate coatings on PET was measured to be 9.4 × 10-3 O₂ cm³ m-2 day-1. This is an order of magnitude less than their constituting single oxides, which opens prospects for their applications as gas barrier layers for organic electronics and food and drug packaging industries. Direct interdependency between the gas barrier and the mechanical properties was not established enabling independent tailoring of these properties for mechanically rigid and impermeable thin film coatings.
Language
  • English
Open access status
gold
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Persistent URL
https://roar.hep-bejune.ch/global/documents/39653
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