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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.3K
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....
18.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.6K
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...
20.6K
Colors and Magnetism03:02

Colors and Magnetism

11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K

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Updated: Jun 14, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Polytypic metal chalcogenide nanocrystals.

Liang Wu1, Yi Li1, Guo-Qiang Liu1

  • 1Department of Chemistry, New Cornerstone Science Laboratory, Institute of Biomimetic Materials & Chemistry, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China. shyu@ustc.edu.cn.

Chemical Society Reviews
|August 30, 2024
PubMed
Summary
This summary is machine-generated.

Chemically identical, structurally distinct polytypic nanostructures offer novel properties for photovoltaics and electronics. This review details colloidal synthesis strategies for metal chalcogenide nanocrystals, overcoming key challenges in their precise control.

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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
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Area of Science:

  • Materials Science and Nanotechnology
  • Solid State Chemistry
  • Semiconductor Physics

Background:

  • Polytypic nanostructures, engineered from chemically identical but structurally distinct materials, exhibit enhanced properties compared to pure phases.
  • Applications in photovoltaics, electronics, and photocatalysis are driven by the unique physical and chemical properties of these nanostructures.
  • Metal chalcogenide nanocrystals are particularly promising for photonics and electronics due to their exceptional performance.

Purpose of the Study:

  • To provide a comprehensive overview of recent advancements in the synthesis and control of polytypic metal chalcogenide nanocrystals.
  • To explore the key factors governing the construction of polytypic structures in these nanomaterials.
  • To discuss the physical properties and diverse applications of polytypic metal chalcogenide nanostructures.

Main Methods:

  • Review of colloidal synthetic strategies for producing polytypic metal chalcogenide nanocrystals.
  • Analysis of factors influencing morphology, composition, crystal structure, size, homojunctions, and periodicity.
  • Examination of structure-property relationships in polytypic nanostructures.

Main Results:

  • Significant progress has been made in synthesizing various polytypic nanocrystals, including IV, III-V, and II-VI semiconductors.
  • Colloidal synthesis offers a viable route for achieving high-precision control over polytypic metal chalcogenide nanostructures.
  • Polytypic nanostructures demonstrate strong correlations between their physical properties and performance in diverse applications.

Conclusions:

  • Polytypic metal chalcogenide nanocrystals hold immense potential for applications in photovoltaics, photocatalysis, transistors, thermoelectrics, stress sensors, and electrocatalytic hydrogen evolution.
  • Overcoming synthetic challenges in precise control of nanostructure features is crucial for unlocking their full capabilities.
  • Future research should focus on addressing remaining challenges and exploring new opportunities in this rapidly advancing field.