Linker-Free Modification of TiO2 Nanorods with PbSe Nanocrystals
| Autor: | Taiwo R. Alabi, Elena Khon, Nishshanka N. Hewa-Kasakarage, Krishna P. Acharya, Maria Kirsanova, Nicholas Schmall, Mikhail Zamkov, Alexander Nemchinov |
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| Rok vydání: | 2009 |
| Předmět: |
Quenching (fluorescence)
Materials science Band gap Heterojunction Nanotechnology Epitaxy Surfaces Coatings and Films Electronic Optical and Magnetic Materials Supramolecular assembly chemistry.chemical_compound General Energy chemistry Nanocrystal Nanorod Physical and Theoretical Chemistry Lead selenide |
| Zdroj: | The Journal of Physical Chemistry C. 113:19531-19535 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp907321h |
| Popis: | We report on a colloidal synthesis of PbSe/TiO2 heterostructures, comprising small-diameter PbSe nanocrystals epitaxially grown onto the surface of TiO2 nanorods. The deposition of lead selenide onto prefabricated TiO2 nanocrystals proceeds via formation of a thin PbSe shell that subsequently breaks into sub-2-nm islands. Additional precursor injections are then used to increase the size of PbSe nanocrystals up to 5 nm. In the case of small-size PbSe, a 2.1-ns transfer of photoinduced carriers into TiO2 domain was evidenced through quenching of the PbSe band gap emission. Overall, the present synthesis demonstrates a colloidal approach to all-inorganic modification of TiO2 surfaces with semiconductor nanocrystals, which provides a viable alternative to a more common supramolecular assembly of nanocrystal-oxide composites. |
| Databáze: | OpenAIRE |
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