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Freestanding 2D Glasses by Atomic Layer Deposition.

Karen M Ehrhardt1, Jessica M Coleman1, Yuqing Gu1

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

ACS Applied Materials & Interfaces
|March 20, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method using Atomic Layer Deposition (ALD) on a modified sodium chloride (NaCl) surface to create large, freestanding ultrathin films. This technique overcomes previous challenges in removing ALD materials from substrates.

Keywords:
2D metal oxidesF-centersamorphous materialsatomic layer depositionplasma activation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Atomic Layer Deposition (ALD) enables precise synthesis of ultrathin materials.
  • Strong substrate-ALD interactions hinder the fabrication of freestanding 2D films.
  • Existing methods face challenges in substrate removal without damaging the ultrathin films.

Purpose of the Study:

  • To develop a novel strategy for fabricating freestanding, large-area ultrathin films using ALD.
  • To overcome the limitations of substrate removal in ALD processes.
  • To enable access to freestanding 2D amorphous materials (glasses) at scale.

Main Methods:

  • Growing ultrathin films (alumina, titania) on single-crystal sodium chloride (NaCl) substrates.
  • Modifying the NaCl surface by inserting hydroxyl groups to create a heterogeneous interface.
  • Utilizing a poly(methyl methacrylate) scaffold for transferring the freestanding films to arbitrary substrates.

Main Results:

  • Successfully fabricated freestanding, amorphous ultrathin alumina and titania films.
  • Demonstrated facile removal of the films from the modified NaCl substrate under mild conditions with minimal damage.
  • Achieved large-area films (1 cm²) with low crack and pinhole density, transferable to new substrates.

Conclusions:

  • The tailored NaCl substrate strategy effectively facilitates the production of freestanding ultrathin films via ALD.
  • This method provides a scalable and accessible route to fabricating 2D amorphous materials.
  • The developed technique opens new possibilities for applications requiring large-area, freestanding ultrathin films.