Linker-Free Modification of TiO2 Nanorods with PbSe Nanocrystals

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...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2009-11, Vol.113 (45), p.19531-19535
Main Authors: Acharya, Krishna P, Alabi, Taiwo R, Schmall, Nicholas, Hewa-Kasakarage, Nishshanka N, Kirsanova, Maria, Nemchinov, Alexander, Khon, Elena, Zamkov, Mikhail
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary: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.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp907321h