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関連する概念動画

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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関連する実験動画

Updated: Jul 13, 2026

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
10:27

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Published on: October 11, 2016

イオン液体中のスキャニングトンネリングスペクトロスコーピー.

Tim Albrecht1, Kasper Moth-Poulsen, Jørn B Christensen

  • 1Department of Chemistry, Nano.DTU, Technical University of Denmark, Building 207, 2800 Kongens Lyngby, Denmark.

Journal of the American Chemical Society
|May 18, 2006
PubMed
まとめ

イオン液体は,スキャニングトンネル顕微鏡における電気化学ゲートとして作用することによって,室温分子電子を可能にします. これは水性電解質の限界を克服し,安定した固体分子装置の道を開く.

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
  • 電気化学 電気化学について

背景:

  • 分子リドックス状態は,分子装置の機能のためのトンネリング電流を制御します.
  • 現在の室温装置は水性電気化学ゲーティングを使用しているが,揮発性や安定性の問題に直面している.
  • イオン性液体は低蒸気圧と高い安定性を有しており,有望な代替品となっています.

研究 の 目的:

  • 分子電子のためのスキャニングトンネル顕微鏡 (STM) の電気化学ゲートとしてイオン液体の使用を調査する.
  • イオン液体ゲーティングを用いたリドックス活性分子における室温トランジスタおよびダイオードの振る舞いを実証する.
  • 先進的な分子電子機器のアプリケーションのためのイオン性液体の可能性を評価する.

主な方法:

  • イオン液体である1-ブチル-3-メチリミダゾリウムヘクサフッロロフォスファート (BMI) を,STMセットアップの電気化学ゲートとして使用しました.
  • 活性分子成分として,酸化還元活性Osビステルピリジン複合体 (Ossac) を採用した.
  • 室温で分子電子機能を観察するための原理実証実験を行った.

主要な成果:

  • 室温でのSTMにおける効果的な電気化学ゲートとしてBMIイオン液体の使用を成功裏に実証しました.

さらに関連する動画

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

関連する実験動画

Last Updated: Jul 13, 2026

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
10:27

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Published on: October 11, 2016

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

  • オサック複合体のトランジスタとダイオードの機能をイオン液体環境で示した.
  • 低揮発性および広範囲の潜在的な利点を確認しました. 分子ゲーティングのためのイオン性液体.

    • 結論:

    • イオン性液体は,分子エレクトロニクスにおける電気化学的ゲーティング,特に室温で実行可能で有利な媒介です.
    • このアプローチは,伝統的な水性電解質の限界を克服し,困難な条件下で分子装置を可能にします.
    • 頑丈で固体分子電子機器の開発に向けた重要な一歩を表しています.