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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...
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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...
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Oxygen adsorption on single layer graphyne: a DFT study.

Baotao Kang1, Hongguang Liu, Jin Yong Lee

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Oxygenating graphyne (a 2D carbon allotrope) transforms it into a semiconductor with tunable electronic properties. This oxygen adsorption creates stable oxides, offering a new way to engineer graphyne for specific applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Graphyne, a novel two-dimensional (2D) carbon allotrope, exhibits promising electronic properties.
  • Understanding the effects of chemical functionalization on graphyne's electronic structure is crucial for its technological applications.

Purpose of the Study:

  • To investigate the electronic properties of oxygenated graphyne using theoretical calculations.
  • To explore the impact of atomic oxygen adsorption on the band structure and electronic behavior of different graphyne isomers (α-, β-, and γ-graphyne).

Main Methods:

  • First-principles calculations were employed to simulate and analyze the electronic properties.
  • Band structure calculations were performed to determine the electronic behavior before and after oxygen adsorption.
  • Binding energies were calculated to assess the stability of oxygenated graphyne.

Main Results:

  • Atomic oxygen forms stable oxides on graphyne with significant binding energy.
  • Oxygen adsorption induces a transition from zero-band-gap to semiconducting behavior in α- and β-graphyne.
  • Spin splitting was observed in the band structure of oxygenated γ-graphyne.
  • The electronic properties are tunable by controlling oxygen coverage via supercell size adjustments.

Conclusions:

  • Oxygenation is an effective strategy for functionalizing graphyne to achieve desired electronic properties.
  • The study demonstrates the potential of oxygenated graphyne as a tunable semiconductor material.
  • First-principles calculations provide valuable insights into the electronic behavior of modified 2D carbon allotropes.