Mechanical Stability of Flexible Graphene-Based Displays

George Anagnostopoulos, Panagiotis Nektarios Pappas, Zheling Li, Ian A. Kinloch, Robert J. Young, Konstantin S Novoselov, Ching Yu Lu, Nicola Pugno, John Parthenios, Costas Galiotis, Konstantinos Papagelis

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    Abstract

    The mechanical behavior of a prototype touch panel display, which consists of two layers of CVD graphene embedded into PET films, is investigated in tension and under contact-stress dynamic loading. In both cases, laser Raman spectroscopy was employed to assess the stress transfer efficiency of the embedded graphene layers. The tensile behavior was found to be governed by the "island-like" microstructure of the CVD graphene, and the stress transfer efficiency was dependent on the size of graphene "islands" but also on the yielding behavior of PET at relatively high strains. Finally, the fatigue tests, which simulate real operation conditions, showed that the maximum temperature gradient developed at the point of "finger" contact after 80 000 cycles does not exceed the glass transition temperature of the PET matrix. The effect of these results on future product development and the design of new graphene-based displays are discussed.

    Original languageEnglish
    Pages (from-to)22605-22614
    Number of pages10
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number34
    DOIs
    Publication statusPublished - 5 Aug 2016

    Keywords

    • CVD graphene
    • mechanical performance
    • Raman spectroscopy
    • touch panel displays
    • wrinkles

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