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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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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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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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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.
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
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Millimeter-Scale Single-Crystalline Semiconducting MoTe2 via Solid-to-Solid Phase Transformation.

Xiaolong Xu1,2, Shulin Chen3, Shuai Liu1

  • 1State Key Lab for Artificial Microstructure & Mesoscopic Physics, School of Physics , Peking University , Beijing 100871 , China.

Journal of the American Chemical Society
|January 12, 2019
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Summary
This summary is machine-generated.

Researchers transformed polycrystalline molybdenum ditelluride (MoTe2) into single-crystalline 2H-MoTe2 using a controlled solid-state phase transition. This breakthrough enables wafer-scale 2D semiconductors and novel heterostructures for advanced electronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Molybdenum ditelluride (MoTe2) exhibits unique properties due to its two distinct phases: semiconducting 2H and metallic 1T'.
  • The small energy difference between these phases makes MoTe2 a promising candidate for phase-engineering applications.

Purpose of the Study:

  • To investigate and control the solid-to-solid phase transformation of MoTe2 from the 1T' to 2H phase.
  • To achieve large-scale synthesis of single-crystalline 2H-MoTe2 and create novel heterostructures.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Transmission electron microscopy (TEM).
  • Energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy.
  • Time-temperature-transformation (TTT) diagram analysis.

Main Results:

  • Demonstrated a solid-state phase transformation from polycrystalline 1T'-MoTe2 to single-crystalline 2H-MoTe2.
  • Synthesized large-domain single-crystalline 2H-MoTe2 (up to 2.34 mm diameter) and centimeter-scale thin films.
  • Fabricated seamless 1T'-2H MoTe2 coplanar homojunctions, offering ohmic contact solutions for 2D semiconductors.

Conclusions:

  • Controlled solid-to-solid phase transformation is a viable route for wafer-scale single-crystalline 2D semiconductors.
  • This method facilitates the creation of coplanar heterostructures for integrated 2D circuitry.
  • The synthesized MoTe2 homojunctions show potential for improving electrical contacts in 2D devices.