Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 23, Pages 6628-6633Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201511174
Keywords
colloidal quantum dots; coordination chemistry; dynamic equilibrium; ligands; surface chemistry
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Funding
- Progetto di ricerca PON RC MAAT [PON02_00563_3316357]
- Future In Research program by Regione Puglia [ZCZP7C3]
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Colloidal quantum dots are composed of nanometer-sized crystallites of inorganic semiconductor materials bearing organic molecules at their surface. The organic/inorganic interface markedly affects forms and functions of the quantum dots, therefore its description and control are important for effective application. Herein we demonstrate that archetypal colloidal PbS quantum dots adapt their interface to the surroundings, thus existing in solution phase as equilibrium mixtures with their (metal-)organic ligand and inorganic core components. The interfacial equilibria are dictated by solvent polarity and concentration, show striking size dependence (leading to more stable ligand/core adducts for larger quantum dots), and selectively involve nanocrystal facets. This notion of ligand/core dynamic equilibrium may open novel synthetic paths and refined nanocrystal surface-chemistry strategies.
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