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Quality Control Method for Liquid Dispersions of 2D Materials

NPL demonstrates a rapid tool for 2D material producers

Photo by Bernd Dittrich on Unsplash

National Physical Laboratory
Tue, 05/02/2023 - 12:02
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Through their exceptional material properties, graphene and related 2D materials have the potential to disrupt technologies such as energy-storage devices, composites, and electronics. Depending on the material, these properties can include high electrical conductivity, high mechanical strength, and high thermal conductivity.

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However, when 2D materials are produced at industrial scale, their properties can differ from materials produced in a laboratory.

Liquid phase exfoliation (LPE) is one of the most widely used methods for producing 2D materials at scale. With this method, bulk powders, such as graphite, are perturbed in an organic solvent to generate shear forces and break the 2D layers apart into smaller nanomaterials—a process known as exfoliation. However, nanoplatelet dispersions produced with this method often contain unexfoliated bulk particles, exhibit a large variation in particle size, and the surface chemistry can vary with the addition of functional chemical groups introduced during synthesis.

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