Cation exchange in nanocrystals allows post-synthetic change of composition with retention of nanocrystal size and shape. This is a powerful tool for producing new materials in forms that are otherwise not available via direct synthesis. We have applied a set of simple principles to improve upon the reagents used for cation exchange and to permit rapid room temperature exchange at high concentration using a variety of metals. We report on the use of these reagents in a variety of metal chalcogenides and the extension of these methods to trivalent metals (Ga, In, Bi) as well as to metal pnictides. Full characterization of cation exchange products with x-ray diffraction, transmission electron microscopy, and elemental analysis are complemented by in situ kinetics measurements to reveal some of the factors that determine rates and whether these reactions will go forward to completion.

New nanocrystalline materials via room temperature cation exchange

2019 Spring National Meeting

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