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Preventing Thin Film Dewetting via Graphene Capping.

Peigen Cao1, Peter Bai2,3, Arash A Omrani1

  • 1Department of Physics, University of California Berkeley, Berkeley, CA, 94720, USA.

Advanced Materials (Deerfield Beach, Fla.)
|July 20, 2017
PubMed
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A high Young

Area of Science:

  • Materials Science
  • Thin Film Physics
  • Nanotechnology

Background:

  • Dewetting of thin films is a critical issue affecting material stability and performance.
  • Existing methods to suppress dewetting often alter the intrinsic properties of the thin films.
  • Understanding the fundamental mechanisms of dewetting is crucial for developing effective stabilization strategies.

Purpose of the Study:

  • To investigate the effectiveness of a monolayer two-dimensional (2D) capping layer in suppressing the dewetting of various underlying thin films.
  • To verify the universality of this 2D capping layer approach across different material classes, including organic semiconductors, polymers, and metals.
  • To elucidate the thermodynamic principles governing dewetting suppression by high Young's modulus 2D materials.

Main Methods:

Keywords:
anti-dewettinggraphenemetallic thin filmspolymeric thin films

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  • Dewetting experiments were conducted on single-layer graphene and molybdenum disulfide (MoS2) transferred onto thin films of polystyrene (PS), semiconducting thienoazacoronene (EH-TAC), and gold.
  • Thermodynamic modeling was employed to analyze the contribution of the 2D capping layer's properties to dewetting suppression.
  • Surface fluctuation analysis was performed in the context of spinodal decomposition to understand the critical conditions for dewetting.

Main Results:

  • A monolayer 2D capping layer with a high Young's modulus effectively suppressed dewetting in organic semiconductor, polymer, and polycrystalline metal thin films.
  • Graphene and MoS2 capping layers demonstrated significant suppression of dewetting across various substrate materials.
  • Thermodynamic modeling confirmed that the high Young's modulus and surface conformity of 2D capping layers substantially reduce surface fluctuations, thereby preventing dewetting.

Conclusions:

  • Monolayer 2D capping layers, such as graphene and MoS2, offer a universal and effective strategy to suppress thin film dewetting.
  • This approach enhances the thermal stability and expands processing parameters for thin films without compromising their inherent physical properties.
  • The 2D monolayer-capping technique presents promising avenues for advanced material design and fabrication.