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Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

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...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Adsorption Isotherms II01:25

Adsorption Isotherms II

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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Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
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Atomic hydrogen adsorbate structures on graphene.

Richard Balog1, Bjarke Jørgensen, Justin Wells

  • 1Department of Physics and Astronomy and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Denmark.

Journal of the American Chemical Society
|June 6, 2009
PubMed
Summary
This summary is machine-generated.

Atomic hydrogen adsorption on graphene/SiC forms dimer structures at low coverage and clusters at high coverage. Hydrogenation occurs on specific SiC-modulated graphene areas, enabling property manipulation.

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
14:11

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties make it a promising material for future electronics.
  • Understanding surface interactions is crucial for controlling graphene's behavior.
  • Graphene on silicon carbide (SiC) substrates offers a route to integrated graphene devices.

Purpose of the Study:

  • To investigate the adsorption structures of atomic hydrogen on graphene.
  • To understand the influence of the SiC substrate on hydrogen adsorption.
  • To explore the potential of hydrogenation for tuning graphene properties.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed to visualize adsorbate structures.
  • Controlled exposure to atomic hydrogen was performed.
  • Analysis of surface morphology and electronic properties was conducted.

Main Results:

  • Atomic hydrogen forms dimer structures at low coverage on graphene.
  • Larger, disordered hydrogen clusters form at higher coverage.
  • Hydrogenation preferentially occurs on specific regions of the graphene surface.
  • These regions are influenced by the underlying SiC 6x6 reconstruction.

Conclusions:

  • The adsorption sites and structures of atomic hydrogen on graphene/SiC are determined.
  • The underlying SiC substrate significantly modulates hydrogen adsorption patterns.
  • Hydrogenation presents a viable method for manipulating graphene's electronic and chemical characteristics.