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Full-Text Articles in Physical Sciences and Mathematics
Linker-Free Modification Of Tio2 Nanorods With Pbse Nanocrystals, Krishna P. Acharya, Taiwo R. Alabi, Nicholas Schmall, Nishshanka N. Hewa-Kasakarage, Maria Kirsanova, Alexander Nemchinov, Elena Khon, Mikhail Zamkov
Linker-Free Modification Of Tio2 Nanorods With Pbse Nanocrystals, Krishna P. Acharya, Taiwo R. Alabi, Nicholas Schmall, Nishshanka N. Hewa-Kasakarage, Maria Kirsanova, Alexander Nemchinov, Elena Khon, Mikhail Zamkov
Physics and Astronomy Faculty Publications
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 …
Synthesis Of Znse/Cds/Znse Nanobarbells Showing Photoinduced Charge Separation, Maria Kirsanova, Alexander Nemchinov, Nishshanka N. Hewa-Kasakarage, Nicholas Schmall, Mikhail Zamkov
Synthesis Of Znse/Cds/Znse Nanobarbells Showing Photoinduced Charge Separation, Maria Kirsanova, Alexander Nemchinov, Nishshanka N. Hewa-Kasakarage, Nicholas Schmall, Mikhail Zamkov
Physics and Astronomy Faculty Publications
We report on it colloidal synthesis of barbell-shaped nanocrystals comprising a type II hetero-junction of ZnSe and US domains and showing compelling evidence of photoinduced charge separation at the interface of ZnSe and US materials. The nanobarbells were fabricated in a two-step procedure by growing ZnSe caps onto polar facets of US nanorods. Under present synthetic conditions, minimal growth of ZnSe shell in the lateral direction and focusing of the barbell length distribution were observed. Formation of epitaxial interfaces between nearly lattice-matched ZnSe and US crystal phases was primarily evidenced by the observation of "spatially indirect" fluorescence and long radiative …
Blue-Shifted Emission In Cdte/Znse Heterostructured Nanocrystals, Nishshanka N. Hewa-Kasakarage, Nilanka P. Gurusinghe, Mikhail Zamkov
Blue-Shifted Emission In Cdte/Znse Heterostructured Nanocrystals, Nishshanka N. Hewa-Kasakarage, Nilanka P. Gurusinghe, Mikhail Zamkov
Physics and Astronomy Faculty Publications
Properties of colloidal heterostructured nanocrystals are largely determined by the spatial distribution of photogenerated carriers across the junction of semiconductor materials that form the heterostructure. The two known types of carrier distributions are identified based on whether both carriers reside within the same (type I) or opposite (type II) sides of the heterojunction. Here we demonstrate the existence of another type of spatial carrier distribution in heteronanocrystals, which corresponds to the localization of both charges along the material junction. Such localization. pattern was realized in novel CdTe/ZnSe heteronanocrystals, where the expected type I infrared emission was dominated by more intense …