Cation exchange provides a method for producing new quantum dot materials that are otherwise difficult to produce. In PbS QDs, cation exchange has thus far been limited to Cd ions. We report here a multi-step approach that yields access to metal sulfide QD heterostructures starting from PbS. Exchange with Ag and Cu is investigated as is subsequent replacement with other metal cations. The cation-exchanged QDs have been characterized via electronic spectroscopy, elemental analysis, and electron microscopy. Effects of the exchange on such properties as chemical stability, band gap energy, and particle morphology are examined and discussed.

Multi-step cation exchange of PbS quantum dots

251st National Meeting (2016)

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