The coordination chemistry of semiconductor nanocrystals

Jonathan Owen

Proceedings of International Conference of Fundamental Processes in Semiconductor Nanocrystals (FQDots14)

Oxford, United Kingdom, 2014 September 8th - 10th

Invited Speaker, Jonathan Owen, presentation 059
Publication date: 27th June 2014

Surfaces dominate the properties of colloidal semiconductor nanocrystals. Characterizing and controlling surface coordination chemistry is therefore crucial to their application in optoelectronics and fluorescence labeling. I will describe our picture of nanocrystal surface structure as well as the application of the covalent bond classification scheme to the description of nanocrystal ligand interactions. Using NMR spectroscopy we have discovered a novel ligand exchange mechanism where the surface layer of excess metal cations on metal chalcogenide nanocrystals is displaced in the presence of neutral donor ligands. We further show this reaction is rapid and reversible leading to nanocrystal stoichiometries that depend sensitively on the solution concentration. The importance of this behavior to luminescence quantum yields and nanocrystal synthesis will be discussed.

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