Investigation of charge transfer in quantum dot (QD) systems is of great interest due to applications in light emitting devices, photocatalytic systems, and solar cells. To optimize these materials, the relationship between capping ligand and charge transfer has been studied. A series of ligands were specifically designed to allow for direct comparison between π-πstacking of electron accepting naphthalene bisimide (NBI), where one ligand allows for these interactions at high surface coverages, and a comparable ligand uses steric bulk to inhibit these interactions. These hybrid materials were studies using UV-Vis, fluorescence, and transient absorption spectroscopy. Interestingly, the sample with the fastest electron transfer was not the sample with the most NBI π-πstacking, it was instead where these ligands were mixed amongst oleic acid, breaking up H-aggregates between the NBI groups. This phenomena is most likely due to H-aggregate formation between the NBI groups, as this would lead to alterations in the HOMO/LUMO gap between the aggregated and non-aggregated forms of the ligands on the QD surfaces.<br/>

Modulating π-π stacking of napthalene bisimide ligand architectures for electron transfer in nanocrystal hybrid materials

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.