Cation exchange provides a method to synthesize altered semiconductor quantum dots (QDs) that can otherwise be difficult to produce. The introduction of transition metal ions to a system offers possibilities for manipulation of the structural, optical and magnetic properties of the QDs. With previous success in cation exchange with PbS QDs, we here report the reactions of several transition metal cations, including cadmium, nickel, silver, iron, manganese, copper, chromium, zinc and cobalt, under various reaction conditions. Ligand exchange, temperature, concentration, reaction time and solvents are examined as important reaction parameters. Optical and structural properties are studied via electronic spectroscopy, elemental analysis, and TEM imaging. Where appropriate, magnetic susceptibility results are also reported as a function of composition and metal distribution within the QDs.

Incorporation of transition metal cations into PbS QDs via cation exchange

249th National Meeting (2015)

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