Sorting two-dimensional nanomaterials by thickness

摘要

The present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating graphene nanomaterials having a controlled number of atomic layer(s).

主权项

1. A method for separating planar nanomaterials by thickness, the method comprising:
centrifuging a transition metal dichalcogenide nanomaterial composition in contact with an aqueous fluid medium comprising a density gradient, wherein the transition metal dichalcogenide nanomaterial composition comprises one or more surface active components and a polydisperse population of planar transition metal dichalcogenide nanomaterials which is polydisperse at least with respect to thickness and has a mean thickness on the order of nanometers; and separating the transition metal dichalcogenide nanomaterial composition into two or more separation fractions each comprising a subpopulation of planar transition metal dichalcogenide nanomaterials from the polydisperse population, wherein the subpopulation of planar transition metal dichalcogenide nanomaterials in at least one of the two or more separation fractions has a mean thickness that is less than the mean thickness of the polydisperse population.