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相关概念视频

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

282
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
282
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
217
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

949
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
949
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.0K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
127
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

925
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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在单分子结节中,基替代模块化分子-电极合.

Zitai Jiang1, Ming Chen2, Shou-Feng Zhang3

  • 1School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.

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这项研究揭示了分子电线中异原子的改变如何影响电子运输. 捐赠-接受-捐赠分子中的基替代物显著影响分子电子学中的导电性和接口合.

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科学领域:

  • 分子电子学分子电子学
  • 材料科学是一种材料科学.
  • 表面化学 表面化学

背景情况:

  • 分子-电极接口对于分子设备中的电子运输至关重要.
  • 优化分子电极合 (MEC) 是关键,但分子骨干结构也调节MEC.
  • 异质原子的结合会影响能量水平和导电性.

研究的目的:

  • 为了研究 chalcogen heteroatoms (氧,硫,) 对 donor-acceptor-donor 分子线的电子传输特性的影响.
  • 了解分子骨干结构,特别是基替代,如何影响分子电极合 (MEC).
  • 阐明介面介导的电荷传输在分子电子设备中的作用.

主要方法:

  • 用氧 (BOD),硫 (BTD) 和 (BSD) 替代物制造和表征分子电线.
  • 使用扫描道显微镜断裂结 (STM-BJ) 技术测量单分子导电.
  • 进行电流-电压 (I-V) 实验和理论分析.

主要成果:

  • 基 (基) 醇核中的基异原子显著影响单分子导电性.
  • 分子连接的演化显然受到了素原子存在的类型的影响.
  • 导电量和连接演变都受到异原子影响的MEC的调制.

结论:

  • 在分子骨干中,基替代对于调整电子传输特性至关重要.
  • MEC是调节电荷传输的一个主要因素,受原子的介面作用的影响.
  • 这些发现提高了对具有量身定制接口的分子设备中电荷传输的基本理解.