With their unique optical and physical properties, colloidal semiconductor nanocrystals are used in a wide range of applications. Most applications require post-synthetic modification of the nanocrystal surface for compatibility with the intended environment. Despite the many recent advances in nanocrystal surface functionalization, an understanding of the ligand exchange reaction dynamics remains limited. This is because a typical ligand replacement process involves the introduction of a large excess of new ligand under conditions that promote fast, complete exchange of ligand molecules. In order to examine the factors, beyond concentration, that control the rates of ligand removal and attachment, we slowed the exchange reaction and studied it using established spectroscopic techniques. By monitoring the reaction as it occurs, we have determined that the exchange reaction can be controlled through ligand choice, solvent environment, and nanocrystal anisotropy. Using this increased understanding of ligand exchange dynamics, we have stabilized colloidal nanocrystals after partial ligand replacement and introduced consecutive ligand molecules to create mixed ligand monolayers on nanocrystal surfaces.

Characterization of the factors that influence nanocrystal surface ligand exchange dynamics

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.