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関連する概念動画

Properties of Transition Metals02:58

Properties of Transition Metals

29.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.8K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.8K
Phase Transitions02:31

Phase Transitions

23.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.4K
Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

21.9K
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
21.9K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.3K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.3K

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関連する実験動画

Updated: Feb 1, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
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ポリモルフ結晶からの横断変異金属二カルコゲニドホモ結合のための溶液処理

Jiajing Wu, Jing Peng, Yuan Zhou

    Journal of the American Chemical Society
    |December 14, 2018
    PubMed
    まとめ
    この要約は機械生成です。

    研究者は,移行金属二カルコゲン化物 (TMD) から高収量横向半導体金属ホモ結合を作成するための新しい溶液処理方法を開発しました. この技術は,高度な2D電子機器のためのこれらの重要なコンポーネントの合成を簡素化します.

    さらに関連する動画

    Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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    Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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    関連する実験動画

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    Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
    10:41

    Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

    Published on: December 20, 2016

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    Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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    Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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    Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh

    Published on: June 23, 2017

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    科学分野:

    • 材料科学
    • ナノテクノロジー
    • 凝縮物質物理学

    背景:

    • 移行金属二カルコゲン化物 (TMD) は次世代2D電子機器の重要な材料です.
    • ナノスケールでTMDポリモルフの 同型結合を合成することは困難です
    • 半導体金属ホモ結合は,高度な電子機器に不可欠です.

    研究 の 目的:

    • 横のTMDホモジャンクションを合成するためのスケーラブルなソリューション処理戦略を開発する.
    • 1T-2H TMDホモジャンクション単層の製造を実証する.
    • これらのホモジュンクションをベースにしたデバイスの性能を向上させる.

    主な方法:

    • 正確に制御されたリチアで 1T-2Hドメインを持つ多形結晶の前駆体を作ります.
    • 個別フェーズを単層にラミネートするためにプログラムされた剥離.
    • ホモジャンクションの構造,境界,およびバンドの並べ替えの特徴.

    主要な成果:

    • 半導体金属ホモ結合の生産
    • 1T-2H TMDホモジャンクション単層の製造,最大数十ミクロメートル.
    • 原子的に鋭いインターフェイスとホモジャンクションの優れたバンドアラインメント.
    • デバイスの状態移行の電場強度の50%の減少

    結論:

    • プログラムされた脱皮による溶液処理は,新しい2Dナノマテリアル構成を作成するための強力な方法です.
    • このアプローチは,複雑なTMDホモジャンクションの合成を簡素化します.
    • 開発されたホモジャンクションは,2Dエレクトロニクスのデバイス性能を改善します.