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相关概念视频

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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相关实验视频

Updated: Jun 22, 2026

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

在石墨烯上具有原子吸附物质结构.

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
概括
此摘要是机器生成的。

在石墨烯/SiC上吸附原子,在覆盖率低时形成二元结构,在覆盖率高时形成集群. 化发生在特定的SiC调制的石墨烯区域上,使得性能可以被操纵.

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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

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

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科学领域:

  • 表面科学是一门学科.
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 石墨烯的独特电子特性使其成为未来电子产品的有希望的材料.
  • 了解表面相互作用对于控制石墨烯的行为至关重要.
  • 在碳化 (SiC) 基板上的石墨烯为集成石墨烯设备提供了一条途径.

研究的目的:

  • 为了研究原子在石墨烯上的吸附结构.
  • 了解SiC基质对吸附的影响.
  • 探索化对调整石墨烯性能的潜力.

主要方法:

  • 使用扫描道显微镜 (STM) 可视化吸附物结构.
  • 进行了对原子的受控暴露.
  • 对表面形态和电子特性进行了分析.

主要成果:

  • 原子在石墨烯的覆盖率较低时形成二元结构.
  • 更大的,无序的团在更高的覆盖面上形成.
  • 化主要发生在石墨烯表面的特定区域.
  • 这些区域受到底层SiC 6x6重建的影响.

结论:

  • 确定了原子在石墨烯/SiC上的吸附点和结构.
  • 底层的SiC基板显著调节吸附模式.
  • 化为操纵石墨烯电子和化学特性提供了一种可行的方法.