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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

136
Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
136

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Creating Two-Dimensional Patterned Substrates for Protein and Cell Confinement
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Strain engineering in monolayer materials using patterned adatom adsorption.

Yao Li1, Karel-Alexander N Duerloo, Evan J Reed

  • 1Department of Applied Physics, Stanford University , Stanford, California 94305, United States.

Nano Letters
|July 23, 2014
PubMed
Summary
This summary is machine-generated.

Strain engineering in monolayer graphene is achieved through patterned adatom adsorption. Specific patterns, like elliptical adsorption, can induce significant tensile and shear strains, offering nanoscale control for advanced materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Monolayer materials, such as graphene, exhibit unique electronic and mechanical properties influenced by strain.
  • Controlling strain at the nanoscale is crucial for tailoring material properties in advanced devices.
  • Adatom adsorption is a potential method for inducing strain, but its effectiveness and mechanisms require detailed investigation.

Purpose of the Study:

  • To explore the potential of patterned adatom adsorption for engineering strain in monolayer materials.
  • To investigate the interplay between in-plane elasticity and out-of-plane relaxation in strain generation.
  • To identify specific adsorption patterns that can induce significant and controllable strain.

Main Methods:

  • Utilized reactive empirical bond order (REBO)-based interatomic potentials for simulations.
  • Investigated strain in monolayer graphene with patterned hydrogen adatom adsorption.
  • Employed an elastic plane stress model to guide understanding and predict strain behavior.

Main Results:

  • Strain in graphene arises from a competition between in-plane elasticity and out-of-plane relaxation.
  • Out-of-plane relaxation causes strain to vanish outside adsorption regions for hydrogen adatoms.
  • Annular adsorption patterns induce ~2% homogeneous tensile strain, while elliptical patterns generate up to 5% tensile strain and ~4% shear strain.

Conclusions:

  • Patterned adatom adsorption offers a viable method for nanoscale strain engineering in monolayer materials.
  • Elliptical adsorption patterns are particularly effective for inducing substantial tensile and shear strains.
  • Understanding geometric conditions is key to avoiding strain-diminishing buckling and scaling the effect to larger areas.