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Related Concept Videos

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....
20.9K
Bonding in Metals02:32

Bonding in Metals

52.8K
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”. 
52.8K
Alkali Metals03:06

Alkali Metals

25.0K
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
25.0K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
24.5K
Properties of Transition Metals02:58

Properties of Transition Metals

30.0K
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.
30.0K
Atomic Structure01:33

Atomic Structure

211.1K
Overview
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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A library of atomically thin metal chalcogenides.

Jiadong Zhou1, Junhao Lin2, Xiangwei Huang3

  • 1Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.

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|April 20, 2018
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Summary

Researchers developed a molten-salt-assisted chemical vapor deposition method to synthesize 47 diverse two-dimensional transition-metal chalcogenides (TMCs). This breakthrough overcomes precursor melting point challenges, enabling broader exploration of TMC properties and applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional transition-metal chalcogenides (TMCs) exhibit unique physical phenomena like superconductivity and valley polarization, with potential for advanced devices.
  • Synthesis of many TMCs is challenging due to high precursor melting points, limiting the variety of accessible materials.
  • Existing synthesis methods, such as sulfurization, selenization, and tellurization, are often insufficient for a wide range of TMCs.

Purpose of the Study:

  • To demonstrate a broadly applicable molten-salt-assisted chemical vapor deposition (CVD) method for synthesizing diverse two-dimensional (atomically thin) transition-metal chalcogenides (TMCs).
  • To overcome limitations posed by high melting points of precursor materials in TMC synthesis.
  • To expand the library of synthesized 2D TMCs for further property investigation and device applications.

Main Methods:

  • Utilized molten-salt-assisted chemical vapor deposition (CVD) technique.
  • Employed molten salts to lower the effective melting points of metal and metal oxide precursors.
  • Facilitated the formation of intermediate products to enhance reaction rates.

Main Results:

  • Successfully synthesized 47 distinct two-dimensional (2D) TMC compounds, including 32 binary, 13 alloys (ternary, quaternary, quinary), and 2 heterostructures.
  • Demonstrated the broad applicability of the molten-salt-assisted CVD method across various transition metals (Ti, Zr, Hf, V, Nb, Ta, Mo, W, Re, Pt, Pd, Fe).
  • Observed superconductivity in monolayer NbSe2 and MoTe2, and high mobilities in MoS2 and ReS2, indicating the utility of the synthesized materials.

Conclusions:

  • Molten-salt-assisted CVD is a versatile and effective method for synthesizing a wide array of 2D TMCs, overcoming previous synthesis barriers.
  • The expanded library of 2D TMCs opens new avenues for fundamental research into their physical properties.
  • This approach facilitates the exploration of potential applications for these novel 2D materials in functional devices.