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Enthalpy of Solution02:39

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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Tin Diselenide Molecular Precursor for Solution-Processable Thermoelectric Materials.

Yu Zhang1, Yu Liu1, Khak Ho Lim2

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Angewandte Chemie (International Ed. in English)
|November 7, 2018
PubMed
Summary

Researchers developed a simple method to create tin diselenide (SnSe₂) nanostructures. Blending these nanostructures with metal nanoparticles significantly enhanced their thermoelectric properties, achieving a figure of merit up to 0.65.

Keywords:
SnSe2modulation dopingnanomaterialreactive inkthermoelectricity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Tin diselenide (SnSe₂) is a promising material for thermoelectric applications.
  • Developing efficient synthesis methods for nanostructured SnSe₂ is crucial for optimizing its properties.
  • Thermoelectric performance is often limited by low electrical conductivity.

Purpose of the Study:

  • To develop a fast and simple solution-based method for synthesizing hexagonal SnSe₂ nanoplates (NPLs).
  • To explore the use of these NPLs in creating crystallographically textured SnSe₂ nanomaterials.
  • To enhance the thermoelectric figure of merit (ZT) of SnSe₂ nanomaterials by incorporating metal nanoparticles.

Main Methods:

  • Solution-based synthesis of hexagonal SnSe₂ NPLs via a screw dislocation-driven mechanism.
  • Formation of flower-like SnSe₂ structures from multiple dislocations.
  • Hot pressing of SnSe₂ structures to create crystallographically textured bulk nanomaterials.
  • Blending SnSe₂ NPLs with metal nanoparticles to improve electrical conductivity.

Main Results:

  • Successfully synthesized hexagonal SnSe₂ NPLs and orthorhombic SnSe nanostructures.
  • Demonstrated screw dislocation-driven growth leading to flower-like SnSe₂ structures.
  • Obtained textured SnSe₂ nanomaterials with anisotropic charge and heat transport.
  • Achieved a three-fold increase in the thermoelectric figure of merit (ZT) by blending SnSe₂ NPLs with metal nanoparticles, reaching ZT values up to 0.65.

Conclusions:

  • The developed solution-based method offers a facile route to SnSe₂ and SnSe nanostructures.
  • Textured SnSe₂ nanomaterials exhibit anisotropic transport properties.
  • Blending SnSe₂ NPLs with metal nanoparticles significantly enhances electrical conductivity and thermoelectric performance.