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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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Sulfuros de metales atómicamente delgados

Lenore Kubie1, Marissa S Martinez1,2, Elisa M Miller1

  • 1Chemistry and Nanoscience Center , National Renewable Energy Laboratory , Golden , Colorado 80401 , United States.

Journal of the American Chemical Society
|July 6, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para sintetizar sulfuros metálicos atómicamente delgados (ATMS) utilizando el intercambio catiónico. Estos nuevos materiales 2D exhiben propiedades ópticas únicas distintas de las formas convencionales.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Química del estado sólido

Sus antecedentes:

  • Los materiales atómicamente delgados suelen tener estructuras en capas como el MoS2 y el grafeno.
  • Los materiales a granel no estratificados carecen de métodos establecidos para producir formas 2D.

Objetivo del estudio:

  • Desarrollar un método de síntesis coloidal para los sulfuros metálicos atómicamente delgados no estratificados (ATMS).
  • Para explorar las propiedades de estos nuevos materiales 2D.

Principales métodos:

  • Síntesis coloidal a través de reacciones de intercambio catiónico.
  • Utilizando sulfuro de plata (Ag2S) en una o varias capas como precursores.
  • Estabilización de ATMS sintetizado utilizando ligandos de tipo Z y L.

Principales resultados:

  • Sintetizó con éxito ZnS, CdS, CoS2 y PbS de una sola y pocas capas a través del intercambio catiónico.
  • Los ATMS sintetizados mantienen el tamaño y la forma, con dimensiones laterales de 5-10 nm.
  • Se observaron propiedades ópticas distintas en el ATMS sintetizado en comparación con las formas de plaquetas o puntos cuánticos.

Conclusiones:

  • El método de intercambio catiónico permite la producción de ATMS sin capas.
  • Estos nuevos materiales 2D ofrecen características ópticas únicas para aplicaciones potenciales.
  • El enfoque de síntesis expande la biblioteca de materiales 2D accesibles más allá de los compuestos en capas tradicionales.