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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

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Related Experiment Video

Updated: Jun 20, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
10:41

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

Published on: December 20, 2016

14.0K

Composition-tunable transition metal dichalcogenide nanosheets via a scalable, solution-processable method.

Rebekah A Wells1, Nicolas J Diercks1, Victor Boureau2

  • 1Laboratory for Molecular Engineering of Optoelectronic Nanomaterials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. Rebekah.Wells@epfl.ch.

Nanoscale Horizons
|February 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a scalable liquid-phase exfoliation method to create tunable two-dimensional (2D) transition metal dichalcogenide (TMD) nanosheets. This approach enables cost-effective production of large-area TMD materials for advanced electronic devices.

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Last Updated: Jun 20, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Two-dimensional (2D) transition metal dichalcogenides (TMDs) offer tunable optoelectronic properties through alloying.
  • Current fabrication methods for alloyed 2D TMDs are not scalable for large-area device production.
  • Developing cost-effective, large-scale synthesis of alloyed TMDs is crucial for next-generation electronics.

Purpose of the Study:

  • To introduce a general, scalable method for producing compositionally tunable 2D TMD nanosheets.
  • To demonstrate the tunability of optoelectronic properties in alloyed TMDs synthesized via this method.
  • To enable the cost-effective production of large-area (m^2) alloyed TMD devices.

Main Methods:

  • Utilizing commercially available powders and liquid-phase exfoliation for TMD nanosheet synthesis.
  • Systematically alloying molybdenum (Mo) and tungsten (W) with sulfur (S) or selenium (Se) to create various TMD compositions.
  • Characterizing the synthesized nanosheets using high-resolution scanning transmission electron microscopy (STEM) and spectroscopic techniques.

Main Results:

  • Successfully produced large quantities of compositionally tunable 2D TMD nanosheets, including Mo(1-x)W(x)S2, Mo0.5W0.5Se2, MoSSe, WSSe, and Mo0.5W0.5SSe.
  • Demonstrated that optoelectronic properties can be precisely tuned by adjusting the composition of the alloyed TMDs.
  • Confirmed the atomic structure and chemical/optoelectronic properties of the synthesized nanosheets.

Conclusions:

  • The developed liquid-phase exfoliation method is a significant advancement for upscaling tailored TMD nanosheets.
  • This transversal method facilitates the production of diverse TMD compositions with tunable properties.
  • The findings pave the way for the widespread application of alloyed TMDs in large-area electronic devices.