AI Article Synopsis
- Core/shell quantum dots (QDs), particularly CdSe/ZnS, display varying optical properties due to differences in their interfacial structures, which are influenced by the synthetic methods used.
- This study utilized time-of-flight medium energy ion-scattering spectroscopy (TOF-MEIS) to analyze the QDs, revealing the presence of an alloyed layer at the CdSe/ZnS interface.
- The research concluded that this interfacial alloying occurs because CdSe seeds dissolve during synthesis, and the type of ligand in the solvent affects the interface shape.
Article Abstract
Core/shell quantum dots (QDs) have been extensively studied, yet their optical properties widely vary among studies. Such variation may arise from the variation in interfacial structures induced by the subtle difference in each synthetic procedure. Here, we studied the interfacial structures of CdSe/ZnS QDs using the time-of-flight medium energy ion-scattering spectroscopy (TOF-MEIS), which offers the radial elemental distributions as well as the overall elemental compositions of QDs. The TOF-MEIS spectra provided strong evidence for the existence of an alloyed layer at the interface between CdSe and ZnS in typical CdSe/ZnS QDs. On the basis of the emission and absorption spectra of QDs sampled during the synthesis, we conclude that such interfacial alloying is caused by the dissolution of CdSe seeds during the synthesis steps. Such a dissolution mechanism is further corroborated by the observation that the ligand environment of solvent (X or L type) leads to different shapes of interfaces.
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| http://dx.doi.org/10.1021/acs.jpclett.2c01923 | DOI Listing |
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