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関連する概念動画

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
08:18

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

グラフェン上にある原子水素アドソルベート構造.

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
まとめ
この要約は機械生成です。

グラフェン/SiCでの原子水素吸附は,低カバーでダイマー構造,高カバーでクラスターを形成する. 水素化は,特定のSiC調節グラフェン領域で発生し,プロパティの操作を可能にします.

さらに関連する動画

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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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

関連する実験動画

Last Updated: Jun 22, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

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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

科学分野:

  • 表面科学とは,地表科学である.
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • グラフェンのユニークな電子特性により,将来の電子機器のための有望な材料となります.
  • 表面の相互作用を理解することは,グラフェンの行動を制御するために重要です.
  • シリコンカーバイド (SiC) 基板のグラフェンは,統合グラフェン装置への経路を提供します.

研究 の 目的:

  • グラフェンにおける原子水素の吸収構造を調査する.
  • 水素吸収に対するSiC基板の影響を理解するために.
  • グラフェンの特性を調節するための水素化の可能性を調査する.

主な方法:

  • スキャントンネル顕微鏡 (STM) を使用して,アドソルベート構造を視覚化しました.
  • 原子水素への制御された曝露が行われました.
  • 表面形態学と電子特性の分析が行われました.

主要な成果:

  • 原子水素は,グラフェンの低い覆い面で二元構造を形成する.
  • より大きな,無秩序な水素のクラスターは,より高いカバーで形成されます.
  • 水素化は,グラフェン表面の特定の領域で好ましく起こります.
  • これらの領域は,基底のSiC 6x6再構成の影響を受けています.

結論:

  • グラフェン/SiCにおける原子水素の吸収部位と構造を決定する.
  • 底にあるSiC基板は,水素吸収パターンを著しく調節する.
  • 水素化は,グラフェンの電子的および化学的特性を操作するための有効な方法です.