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- W2333083103 abstract "Semiconductor core–shell nanocrystals (NCs) have greatly improved luminescent properties including better resistance to photobleaching and ligand exchange. It was suggested that compound alloying at the core/shell interface could play an important role in obtaining bright and stable NCs. Here, we investigate the interface composition and strain evolution in spherical and dot-in-plate CdSe/CdS nanocrystals with shell thickness ranging from 1 to 3 nm, using a combination of Raman and infrared spectroscopy. A slower rate of strain accumulation in the core is observed for dot-in-plate nanocrystals and is linked to the anisotropic shape of the plate-like shell. We resolved the respective contributions of the core, shell, and alloyed interface and observed a drastic change of the shell-related Raman feature with the appearance of the bulk-like optical phonon in the shell thicker than 1 nm. The average composition of the alloy interface is estimated using the frequencies of the alloy modes. Because of the high crystallinity of the samples, up to fourth-order optical phonon processes are observed and analyzed. This work confirms the presence of an alloyed interface in core/shell CdSe/CdS structures of different geometries and establishes a precise roadmap for its quantitative analysis using vibrational spectroscopy." @default.
- W2333083103 created "2016-06-24" @default.
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- W2333083103 date "2013-08-23" @default.
- W2333083103 modified "2023-10-18" @default.
- W2333083103 title "Raman- and IR-Active Phonons in CdSe/CdS Core/Shell Nanocrystals in the Presence of Interface Alloying and Strain" @default.
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- W2333083103 doi "https://doi.org/10.1021/jp4046808" @default.
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