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| Title
| - Multimodal Distribution of Quantum Confinement in Ripened CdSe Nanocrystals
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| Abstract
| - We observe different species emerging during the Ostwald ripening stage of colloidal CdSe preparations in organic media. The evolution of one into several bands can be followed in emission and absorption spectra. TEM images reveal faceted particles of different size. Water traces are believed to trigger etching and coalescence processes leading to the particle speciation.
- We present three different preparation methods for CdSe colloidal nanoparticles that, when carried out into the Ostwald ripening regime, lead to the development of complex spectral patterns resulting from the overlap of several distinct components corresponding to different kinds of nanoparticles coexisting in solution. Although several polyhedral shapes are present in the transmission electron microscopy images, the main spectral difference appears to be essentially due to different sizes. We explain the generation of different species with a mechanism implying a controlled etching of the initially spherical particles and their subsequent coalescence into larger particles. We suggest that the presence of water and oxygen in the chemical equilibria may favor this process.
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| - Multimodal Colloidal CdSe Ripening
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