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Network Covalent Solids02:18

Network Covalent Solids

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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...
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Metallic Solids02:37

Metallic Solids

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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....
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Carbon Skeletons01:12

Carbon Skeletons

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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
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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...
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アモルフなCに固定されたAu原子

Jian Yu1, Chao Chen2, Qinghua Zhang3

  • 1School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Beihang University, Beijing100191, China.

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|November 24, 2022
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まとめ

研究者らは,炭酸ガスのナノシートに黄金の単一の原子を用いた新しい単原子強化ラーマン分散 (SAERS) 効果を発見した. この画期的な発見により 安定した再現可能なSERS検出が可能になり 単原子材料の先進的な応用への道が開けています

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • スペクトロスコーピー

背景:

  • 表面強化ラーマン散布 (SERS) は通常貴金属ナノクラスターに依存しています.
  • ナノクラスタを原子レベルまで縮小すると,表面プラズモンの共鳴効果がなくなり,原子スケールでのSERS研究が制限されます.
  • 既存のSERS基板は,ナノ粒子の集積により安定性と再現性が低下することが多い.

研究 の 目的:

  • 単原子高貴金属のラマン散乱の強化の可能性を調査する
  • 安定性と再現性を高める新しいSERS基板を開発する.
  • 単原子強化ラーマン散乱の背後にあるメカニズムを解明する.

主な方法:

  • 単一の金原子を無形な炭素窒化物 (C3N4) ナノシート (Au1/ACNs) に固定する.
  • 合成されたAu1/ACNを均一な原子分散のために特徴づける.
  • SERS基板としてのAu1/ACNのスペクトル安定性,再現性,および強化因子を評価する.
  • 電荷伝送と電子特性の理論的分析を通して, 基礎となる強化メカニズムを調査する.

主要な成果:

  • アモルフなC3N4ナノシート (Au1/ACNs) にAU単一の原子を用いて,新しい単原子強化ラーマン分散 (SAERS) 効果が発見されました.
  • Au1/ACNは,ホットスポット集積を防止する均一な原子分散により,優れたスペクトル安定性と再現性を示した.
  • 2.5 × 10 ^ 4の印象的な強化因子は,約2.5%のAuコーティング領域で達成されました.
  • Au単一の原子とC3N4の間のシネジスティック効果が特定され,分子二極 Momentと分極性を増加させました.
  • 単一原子の電荷移転機構が提案され,クラスターと比較して単一のAU原子の優越した電子移転性と電子密度が強調された.

結論:

  • 単原子強化ラーマン散乱 (SAERS) は,従来のSERSとは異なる実用的な現象である.
  • 適した支柱に均等に分散した単一の原子は,ラマン光譜の卓越した安定性と再現性を提供します.
  • この発見は,強化されたラーマン光譜および関連分野における単原子材料の適用のための新しいパラダイムを確立します.