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Stabilization of graphene nanopore.

Jaekwang Lee1, Zhiqing Yang2, Wu Zhou3

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831;Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235; leej2@ornl.gov chisholmmf@ornl.gov.

Proceedings of the National Academy of Sciences of the United States of America
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Silicon atoms stabilize unstable graphene nanopores by bridging dangling bonds. This breakthrough enables robust, long-lasting nanopores for advanced applications like molecular translocation devices.

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STEM imagingdensity-functional theorynanopore stabilizationself-healing process

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Graphene's unique properties make it ideal for applications such as water purification and DNA sequencing.
  • Creating stable nanopores in graphene is crucial for these applications.
  • Existing graphene nanopores are unstable and prone to filling by carbon adatoms.

Purpose of the Study:

  • To investigate a method for stabilizing graphene nanopores.
  • To understand the mechanism behind nanopore stabilization.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (STEM) was used to observe nanopore structures.
  • Density-functional theory (DFT) calculations were employed to model the interactions at the atomic level.

Main Results:

  • Silicon (Si) atoms were found to stabilize graphene nanopores by binding to dangling bonds at the pore edges.
  • Si-passivated nanopores demonstrated remarkable stability against electron beam irradiation and carbon adatom filling.
  • These stabilized pores remained intact for several months after fabrication, indicating intrinsic robustness.

Conclusions:

  • Si passivation offers a novel and effective strategy for creating stable graphene nanopores.
  • This advancement is a significant step towards the development of reliable graphene-based molecular translocation devices.
  • The findings pave the way for practical applications in filtration, separation, and sensing technologies.