Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 2, Pages 244-250Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am8001583
Keywords
semiconductor nanocrystals; surface chemistry; dipole mediated network formation
Funding
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- gebied Chemische Wetenschappen of the NWO
- Stichting Shell Research
- EU Integrated Project NAIMO [NMP4-CT-2004-500355]
- NanoNed
- Cornell College
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Solution phase pyridine treatment displaced oleic acid capping ligands form the surface of PbSe nanocrystals. During ligand displacement the nanostructure morphology dramatically changed from well-stabilized, individual nanocrystals to form crystallographically connected nanocrystal networks. The network morphology was governed by the diameter of the constituent nanocrystals. Larger nanocrystals showed dipolar alignment but maintained individual nanocrystal character, while smaller nanocrystals crystallographically fused along the < 100 > axis. Optical studies of nanocrystal thin films showed that pyridine ligand displacement quenches the nanocrystal photoluminescence. Blends of nanocrystals and conjugated polymer showed photoluminescence quenching of the polymer with increasing nanocyrstal content. The content of photoluminescence quenching was only weakly dependent on the nanocrystal size or surface chemistry, suggesting that the interaction between nanocrystal and polymer is mostly in the form of energy transfer rather than change transfer.
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