Nanocrystal superlattices with thermally degradable hybrid inorganic-organic capping ligands |
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Authors: | Kovalenko Maksym V Bodnarchuk Maryna I Talapin Dmitri V |
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Institution: | Department of Chemistry and James Frank Institute, University of Chicago, Chicago, Illinois 60637, United States. mvkovalenko@uchicago.edu |
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Abstract: | Colloidal metallic and semiconductor nanocrystals (NCs) functionalized with metal chalcogenide complexes (MCCs) have shown a promise for designing materials that combine high carrier mobility with the electronic structure of strongly quantum-confined solids. Here we report a simple and general methodology for switching the repulsive forces responsible for colloidal stabilization of MCC-capped NCs from long-range electrostatic to short-range steric through the formation of tight ionic pairs with cationic surfactants. This noncovalent surface modification remarkably improved the ability of MCC-capped NCs to self-assemble into long-range ordered superlattices. These NCs are highly soluble in nonpolar solvents and compatible with various technologically relevant organic molecules and polymers. The hybrid inorganic-organic coating can be thermally decomposed at significantly lower temperatures compared to those required for removal of conventional organic ligands. |
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