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Updated: Mar 7, 2026

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

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

Published on: December 20, 2016

Solution-Based Processing of Monodisperse Two-Dimensional Nanomaterials.

Joohoon Kang¹, Vinod K Sangwan¹, Joshua D Wood¹

¹Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States.

Accounts of Chemical Research

|February 28, 2017

Summary

This summary is machine-generated.

Researchers developed solution-based separation techniques to create monodisperse two-dimensional (2D) nanomaterials. These methods enable precise control over flake size and thickness for advanced applications.

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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
Physical Chemistry

Background:

The isolation of two-dimensional (2D) nanomaterials, inspired by graphene, has revealed unique properties for diverse applications.
Micromechanical exfoliation offers high quality but lacks scalability for industrial use.
Solution-processing methods enable large-scale 2D nanomaterial isolation but often yield polydisperse dispersions.

Purpose of the Study:

To review advancements in solution-based separation techniques for producing monodisperse 2D nanomaterial dispersions.
To highlight the importance of precise control over lateral size and thickness for 2D nanomaterials.
To discuss the potential of these monodisperse dispersions in emerging technologies.

Main Methods:

Survey of solution-based exfoliation methods for 2D nanomaterials in various media.
Evaluation of sedimentation-based density gradient ultracentrifugation (sDGU) and isopycnic DGU (iDGU) for post-exfoliation separation.
Analysis of separation method suitability based on nanomaterial properties like density and reactivity.

Main Results:

Solution processing provides scalable routes to 2D nanomaterials, crucial for applications like thin-film transistors and solar cells.
Post-exfoliation separation techniques, particularly DGU methods, are essential for achieving monodispersity in size and thickness.
Comparative analysis of sDGU and iDGU in different media demonstrates their effectiveness for various 2D nanomaterials.

Conclusions:

Achieving monodisperse 2D nanomaterial dispersions via solution processing is critical for realizing their full potential in advanced technologies.
Density gradient ultracentrifugation offers precise separation of 2D nanomaterials, enabling tailored properties for specific applications.
Further development in separation and thin-film formation will drive innovation in fields utilizing emerging 2D materials.