Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Photovoltaics (Joint session of HL and DF, organized by HL)

HL 12.1: Hauptvortrag

Montag, 7. März 2016, 14:45–15:15, H2

Surface chemistry of colloidal semiconductor nanocrystals — •Zeger Hens — Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, B9000 Gent, Belgium

Colloidal semiconductor nanocrystals or quantum dots are hybrid nano-objects composed of an inorganic, crystalline core capped by organic surface ligands. This talk addresses recent advances in the understanding of this ligand shell. First, solution NMR will be introduced as a unique, in-situ analysis technique for identifying and quantifying these ligands and for analysing ligand exchange reactions. This has recently led to the classification of nanocrystal/ligand nanocrystals based on the ligand binding motif, where use is made of the covalent bond classification scheme that was originally introduced for the classification of metal complexes. It is shown how this classification enables ligand exchange reaction to be rationalized and predicted and how this now provides researchers with an extensive toolbox to tweak nanocrystal properties at will by changing their surface chemistry. In the last part of the talk, the extension of the approach to metal oxide nanocrystals is addressed. It is shown that these feature a markedly different surface chemistry, which enables for example their use as colloidal nanocatalysts.