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Structures of Solids02:22

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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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The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one...
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Amorphous and Crystalline Solids; Unit Cell and Lattice Systems
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Unconventional Atomic Structure of Graphene Sheets on Solid Substrates.

Jinjin Zhang1,2, Yizhou Yang2,3, Shuo Yang2

  • 1Zhangjiang Lab, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China.

Small (Weinheim an Der Bergstrasse, Germany)
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new, highly ordered orthorhombic structure in graphene, challenging the conventional view of its atomic arrangement. This controllable structure, influenced by interfacial electric fields, opens new possibilities for manipulating graphene lattices.

Keywords:
atomic force microscopy (AFM)first principles computationsgraphenepeptide self-assemblyunconventional atomic structures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene's atomic structure is typically described as flat hexagonal rings with a 2.5 Å period, dictating its unique properties.
  • The conventional understanding assumes this hexagonal structure is the sole atomic configuration of graphene.

Purpose of the Study:

  • To investigate an unexpected, highly ordered atomic structure of graphene observed on various substrates.
  • To elucidate the mechanism behind the formation of this unconventional graphene structure and explore its controllability.

Main Methods:

  • Direct observation of graphene's atomic structure.
  • First-principles computations to model the interactions between graphene and substrates.
  • Controlled manipulation of interfacial electric fields.

Main Results:

  • Direct observation of a highly ordered orthorhombic graphene structure with a lattice constant of approximately 5 Å.
  • First-principles calculations attribute this structure to interfacial electric fields generated by substrate dipoles, inducing atomic rearrangement.
  • Demonstration that the orthorhombic structure formation is controllable via artificial interfacial electric fields and is reversible.

Conclusions:

  • The study reveals a previously unrecognized orthorhombic atomic structure in graphene, distinct from the conventional hexagonal lattice.
  • Interfacial electric fields play a crucial role in inducing and controlling this novel graphene structure.
  • The controllable orthorhombic graphene lattice offers new pathways for manipulating graphene and its self-assembly properties, including amyloid formation.