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関連する概念動画

Structures of Solids02:22

Structures of Solids

17.7K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
17.7K
Network Covalent Solids02:18

Network Covalent Solids

16.2K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.2K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.0K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.0K
Metallic Solids02:37

Metallic Solids

20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

54.9K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
54.9K
Energy Bands in Solids01:01

Energy Bands in Solids

2.0K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
2.0K

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Updated: Jan 30, 2026

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

7.3K

ミリメートルスケールの単結晶半導体MoTe2は,固体から固体への相変換による.

Xiaolong Xu1,2, Shulin Chen3, Shuai Liu1

  • 1State Key Lab for Artificial Microstructure & Mesoscopic Physics, School of Physics , Peking University , Beijing 100871 , China.

Journal of the American Chemical Society
|January 12, 2019
PubMed
まとめ
この要約は機械生成です。

研究者は,多結晶モリブデン・ディテルリド (MoTe2) を,制御された固体相移行を使用して単結晶2H-MoTe2に変換した. このブレークスルーにより ウェイファースケールの2D半導体と 革新的なヘテロ構造が 進歩した電子機器に利用できます

さらに関連する動画

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

Published on: November 2, 2011

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • ナノテクノロジー

背景:

  • モリブデン・ディテルリド (MoTe2) は,半導体2Hと金属1Tの2つの異なる相によりユニークな性質を備えている.
  • これらの相の間の小さなエネルギー差は,MoTe2を相工学のアプリケーションに有望な候補にしています.

研究 の 目的:

  • MoTe2の1T'から2Hへの固体相変換を調査し,制御する.
  • 単結晶の2H-MoTe2を大規模に合成し,新しいヘテロ構造を作り出す.

主な方法:

  • 密度関数理論 (DFT) の計算
  • トランスミッション電子顕微鏡 (TEM)
  • エネルギー分散型X線スペクトル検査 (EDS),X線光電子スペクトル検査 (XPS),ラマンスペクトル検査
  • 時間-温度変換 (TTT) 図分析

主要な成果:

  • 多結晶の1T'-MoTe2から単結晶の2H-MoTe2への固体相変換が実証された.
  • 大領域単結晶2H-MoTe2 (直径2.34mmまで) とセンチメートルスケールの薄膜を合成した.
  • 2D半導体のためのオームコンタクトソリューションを提供する1T'-2H MoTe2コプラナーホモジャンクションを製造.

結論:

  • 制御された固体から固体への相変換は,ウェーファースケールの単結晶2D半導体にとって実行可能な経路である.
  • この方法は,2D統合回路のためのコプラナーヘテロ構造の作成を容易にする.
  • 合成されたMoTe2ホモ結合は,2Dデバイスの電気コンタクトの改善の可能性を示しています.