Photoluminescence Quenching of CdSe/ZnS Quantum Dots by Molecular Ferrocene and Ferrocenyl Thiol Ligands
| Autor: | G. Julius Vancso, Aldrik Velders, Nikodem Tomczak, Denis Dorokhin, David Reinhoudt |
|---|---|
| Přispěvatelé: | Materials Science and Technology of Polymers |
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Quenching Photoluminescence Nanoparticle METIS-260520 Nuclear magnetic resonance spectroscopy Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy chemistry Ferrocene Quantum dot Physical and Theoretical Chemistry Absorption (chemistry) Alkyl |
| Zdroj: | Journal of physical chemistry C, 113, 18676-18680. American Chemical Society |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Photoluminescence quenching of CdSe/ZnS quantum dots (QDs) by molecular ferrocene and ferrocenyl thiols was investigated by steady-state absorption and emission spectroscopy. Modification of QD surfaces with ferrocenyl thiols exhibiting different lengths of the alkyl chains (6, 8, and 11 carbon units) was performed by ligand-exchange reaction. These alkyl chains function as spacers between the QDs and ferrocene. Diffusion-filtered NMR spectroscopy was applied to characterize the surface of the modified nanoparticles. Ferrocene and ferrocenyl thiols bound to the QD surface efficiently quenched the QD photoluminescence. Charge transfer between the photoexcited QD and ferrocene is ascribed as possible quenching mechanism. At maximum surface coverage the quenching efficiency of ferrocenyl thiols at the QD surface depends on the hydrocarbon spacer length. |
| Databáze: | OpenAIRE |
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