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関連する概念動画

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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強い分子-電極結合を持つ単一分子結節.

Masateru Taniguchi1, Makusu Tsutsui, Kohei Shoji

  • 1The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan. taniguti@sanken.osaka-u.ac.jp

Journal of the American Chemical Society
|September 18, 2009
PubMed
まとめ
この要約は機械生成です。

黄金製の単分子結合をテトラチアフルバレン (TTF) とテトラセレナフルバレン (TSF) で研究しました. TTF接続は,TSF接続と比較して,より強い分子-電極結合により,より高い伝導性を示した.

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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

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科学分野:

  • 分子電子は分子電子である.
  • ナノテクノロジー ナノテクノロジー
  • マテリアルサイエンス 材料科学

背景:

  • 単一分子結合は,分子電子学の進歩に不可欠です.
  • 分子-電極結合の理解は,交差点の性質を制御するための鍵です.

研究 の 目的:

  • Au-TTF-AuとAu-TSF-Auの単分子結合の電気伝導性を製造し,比較する.
  • 分子構造,結合強度,導電性との関係を調査する.

主な方法:

  • 機械的に制御可能なブレイクジャンクションを使用して単一分子結合の製造.
  • ゴールドテトラチアフルバレンゴールド (Au-TTF-Au) とゴールドテトラセレナフルバレンゴールド (Au-TSF-Au) システムの電気特性.
  • 交差点の安定性と伝導性の値の分析.

主要な成果:

  • Au-TTF-Auの接続は2つの安定した構成を示し,Au-TSF-Auの接続は1つの安定した構成を示した.
  • Au-TTF-Auの単分子伝導性は,Au-TSF-Auよりも高いことが判明しました.
  • 導電性の差異は,分子-電極結合の異なる強さに起因する.

結論:

  • 分子-電極結合の強さは,単一分子結合の伝導性に大きく影響する.
  • 面対面の重複構成は,結合と伝導性に影響します.
  • TTFベースの接続は,より強いカップリングにより,TSFベースの接続よりも高い伝導性を提供します.