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Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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ビスマットプラズモニックアンテナ

Michael Foltýn1, Tomáš Šikola1,2, Michal Horák1

  • 1Brno University of Technology, Central European Institute of Technology, Purkyňova 123, Brno 612 00, Czech Republic.

ACS nano
|September 1, 2025
PubMed
まとめ
この要約は機械生成です。

ビズマスアンテナは,可視光線と近赤外線スペクトルで調節可能なプラズモン共鳴を示し,アンテナのサイズと形状を光学特性と相関させます. これは,プラズモニックアプリケーションのコスト効率の良い代替品としてビスムスを位置づけます.

キーワード:
ビスマス電子エネルギー損失スペクトロスコーピー局所化された表面プラズモンナノフォトニクスプラズモニックアンテナ

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 光学について

背景:

  • プラズモニック材料は ナノスケールでの光操作を可能にします
  • 金は一般的なプラズモニック金属ですが,高価です.
  • ビズムはプラズモニクスのスペクトル帯域幅で理論上の利点を提供します.

研究 の 目的:

  • ビスムートプラズモニックアンテナの幾何学と光学特性の関係を実験的に調査する.
  • プラズモニック装置の 低コストの代替品として ビスムスを評価する.

主な方法:

  • 焦点化されたイオンビームリトグラフィーを用いた棒形とボウタイビスマートアンテナの製造.
  • スキャニング伝送電子顕微鏡と電子エネルギー損失スペクトロスコピーによるアンテナ構造と光学特性の特徴付け.

主要な成果:

  • ビスマスアンテナは局所的な表面プラズモン共鳴をサポートします.
  • アンテナ二極モードは,アンテナサイズを変更することで,近赤外線から可視スペクトルに調節できます.
  • ビズムは高エネルギーで性能を維持し,黄金に似たプラズモンの分散関係を示す.

結論:

  • アンテナの設計に基づいたビスマートの調節可能なプラズモニック特性の実験的検証.
  • ビスマウトは,特に高エネルギーでは,黄金と同等なプラズモニック性能を示しています.
  • ビズマスは先進的なプラズモンの用途に 有望で費用対効果の高い材料です