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Predicting Molecular Geometry

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

Metallic Solids

Metallic Solids

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. Many...

Network Covalent Solids

Network Covalent Solids

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...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Phase Diagrams of Ternary Systems

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

Cell Diagrams and IUPAC Conventions

Cell Diagrams and IUPAC Conventions

Electrochemical cell notation is a standardized symbolic representation that communicates the structure and reaction pathway of galvanic and electrolytic cells. This notation plays a critical role in describing redox reactions and electrochemical cell configurations without the need for detailed diagrams.In electrochemical cell notation, a single vertical line “|” denotes a phase boundary, such as between a solid electrode and an aqueous solution. A double vertical line “||” represents a salt...

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関連する実験動画

Updated: Jul 13, 2026

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

電子的な閉じ込めと,パターンの付近軸グラフェンにおける一貫性.

Claire Berger¹, Zhimin Song, Xuebin Li

¹School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Science (New York, N.Y.)

|April 15, 2006

まとめ

シリコンカーバイドで育った超薄のエピタキシアルグラフェンは,ユニークな電子特性を発揮します. この新しい素材は,将来の電子アプリケーションの可能性のある先進的なグラフェンデバイスの作成を可能にします.

さらに関連する動画

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Published on: February 8, 2022

関連する実験動画

Last Updated: Jul 13, 2026

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers

Published on: February 8, 2022

科学分野:

マテリアルサイエンス材料科学
凝縮物質物理学凝縮物質物理学
ナノテクノロジーナノテクノロジー

背景:

超薄のエピタキシアルグラフェンは,電子アプリケーションの有望な材料です.
グラフェンのユニークな電子特性には,研究上の大きな関心があります.
シリコンカービッドは,高品質のグラフェンの成長のための基板として機能します.

研究の目的:

単結晶シリコンカービッドに超薄のエピタキシアルグラフェンを育てるために.
成長したグラフェンの輸送特性と電子的振る舞いを調査するために.
グラフェンベースの電子機器の製造の可能性を調査する.

主な方法:

シリコンカーバイド上のエピタキシアルグラフェンの成長のための真空グラフィティゼーション.
グラフェン構造をパターニングするための標準のナノリトグラフィー.
低温 (4 ケルビン) の電気輸送測定. 低温 (4 ケルビン) の電気輸送測定.

主要な成果:

シングル・クリスタル・シリコン・カーバイドで真空グラフィティゼーションで達成されたグラフェンの成長.
輸送特性は,単一のエピタキシアルグラフェン層によって支配され,電荷キャリアのディラク性質を明らかにします.
パターン化された構造は,量子収束と相相合長 > 1 マイクロメートルを示しています.
2.5 m2/Vsを超える電子の移動性が測定されました.

結論:

シリコンカービッド上の超薄のエピタキシアルグラフェンは,高度な電子機器のための有効な材料です.
観測された量子効果と高いモビリティは,新しいデバイスアーキテクチャの道を開く.
オールグラフェン製の電子的に一貫性のあるデバイスは,現実的な将来の見通しです.