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Videos de Conceptos Relacionados

Properties of Transition Metals02:58

Properties of Transition Metals

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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.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

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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...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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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...
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Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
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Procesamiento de soluciones para la homounión de dicalcogénidos de transición lateral a partir de cristales

Jiajing Wu, Jing Peng, Yuan Zhou

    Journal of the American Chemical Society
    |December 14, 2018
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los investigadores desarrollaron un nuevo método de procesamiento de soluciones para crear homojunciones de semiconductores laterales de alto rendimiento a partir de dicalcogenuros de metales de transición (TMD). Esta técnica simplifica la síntesis de estos componentes cruciales para la electrónica 2D avanzada.

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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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    Área de la Ciencia:

    • Ciencias de los materiales
    • Nanotecnología
    • Física de la materia condensada

    Sus antecedentes:

    • Los dicalcogenuros de metales de transición (TMD) son materiales clave para la electrónica 2D de próxima generación.
    • La síntesis de homojunciones de polimorfos TMD a nanoescala es un desafío.
    • Las uniones metálicas laterales de semiconductores son esenciales para los dispositivos electrónicos avanzados.

    Objetivo del estudio:

    • Desarrollar una estrategia de procesamiento de soluciones escalable para la síntesis de homojunciones TMD laterales.
    • Para demostrar la fabricación de monocapas de homojunción 1T-2H TMD.
    • Mejorar el rendimiento de los dispositivos basados en estas homojunciones.

    Principales métodos:

    • Litiado controlado con precisión para crear precursores cristalinos polimórficos con dominios 1T-2H.
    • Exfoliación programada para laminar las fases individuales en monocapas.
    • Caracterización de la estructura de la homounión, los límites y la alineación de la banda.

    Principales resultados:

    • Producción de homojunciones metálicas de semiconductores laterales de alto rendimiento.
    • Fabricación de monocapas de homojunción 1T-2H TMD de hasta decenas de micrómetros.
    • Interfaces atómicamente nítidas y alineación de banda superior en las uniones.
    • Una reducción del 50% en la intensidad del campo eléctrico para la transición de estado en los dispositivos.

    Conclusiones:

    • El procesamiento de soluciones con exfoliación programada es un método poderoso para crear nuevas configuraciones de nanomateriales 2D.
    • Este enfoque simplifica la síntesis de las complejas homojunciones TMD.
    • Las homojunciones desarrolladas ofrecen un mejor rendimiento del dispositivo para la electrónica 2D.