Cation exchange (CE) reactions offer avenues to new types of nanostructures, and under the right conditions, partial CE may even provide routes to novel nanoheterostructures. Partial CE may also provide routes to known nanoheterostructures using conditions that are milder or otherwise superior to the established methods. In order to attain these benefits of CE it is first necessary to develop an understanding of how cations are distributed in the daughter nanocrystals produced via CE. Here we present results from recent and ongoing studies concerning the distribution of metal cations following CE reactions in which only a portion of the cations in the initial QDs are exchanged. Structural features of the daughter particles have been studied via powder x-ray diffraction (PXRD), transmission electron microscopy (TEM), and high-resolution scanning transmission electron microscopy with energy-dispersive spectroscopy (STEM-EDS) to map elemental distribution within particles at near atomic scale.

Cation distribution in composite quantum dots prepared by partial cation exchange

256th National Meeting (2018)

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