Cation exchange in semiconductor quantum dots provides a route to new nanoheterostructures with novel properties. In PbS quantum dots, many examples of exchange with Cd ions have previously been reported; however, exchange with other metal ions has proven elusive. We report here on methods that permit exchange with Zn ions and discuss the key principles that govern the success of the process. The ion-exchanged particles are characterized via electronic spectroscopy, x-ray fluorescence, and transmission electron microscopy. The effects of Zn introduction on particle morphology, optical properties, and chemical/thermal stability are discussed.

Cation exchange in quantum dots: Lessons from the Zn/Pb system

251st National Meeting (2016)

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