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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. Many...
Network Covalent Solids02:18

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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.
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Phase Diagrams of Ternary Systems01:28

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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...
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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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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Published on: November 7, 2016

El confinamiento electrónico y la coherencia en el grafeno epitaxial modelado.

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
PubMed
Resumen

El grafeno epitaxial ultrafino cultivado en carburo de silicio exhibe propiedades electrónicas únicas. Este nuevo material permite la creación de dispositivos avanzados de grafeno con potencial para futuras aplicaciones electrónicas.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El grafeno epitaxial ultrafino es un material prometedor para aplicaciones electrónicas.
  • Las propiedades electrónicas únicas del grafeno son de gran interés para la investigación.
  • El carburo de silicio sirve como sustrato para el crecimiento de grafeno de alta calidad.

Objetivo del estudio:

  • Para hacer crecer grafeno epitaxial ultradelgado en carburo de silicio monocristalino.
  • Para investigar las propiedades de transporte y el comportamiento electrónico del grafeno cultivado.
  • Explorar el potencial para la fabricación de dispositivos electrónicos basados en grafeno.

Principales métodos:

  • Grafitización al vacío para el crecimiento de grafeno epitaxial en carburo de silicio.
  • Nanolitografía estándar para el patrón de las estructuras de grafeno.
  • Mediciones de transporte eléctrico a baja temperatura (4 Kelvin).

Principales resultados:

  • El crecimiento del grafeno se logra en el carburo de silicio monocristalino a través de la grafitización al vacío.
  • Las propiedades de transporte dominadas por la única capa epitaxial de grafeno, revelan la naturaleza Dirac de los portadores de carga.
  • Las estructuras con patrones exhiben confinamiento cuántico y longitudes de coherencia de fase > 1 micrómetro.
  • Se midieron movilidades de electrones superiores a 2,5 m2/Vs.

Conclusiones:

  • El grafeno epitaxial ultrafino en carburo de silicio es un material viable para la electrónica avanzada.
  • Los efectos cuánticos observados y la alta movilidad allanan el camino para nuevas arquitecturas de dispositivos.
  • Todos los dispositivos electrónicamente coherentes de grafeno son una perspectiva de futuro realista.