Near-Infrared Cu−In−Se-Based Colloidal Nanocrystals via Cation Exchange
| Main Authors: | Lox, Josephine F. L., Dang, Zhiya, Dzhagan, Volodymyr M., Spittel, Daniel, Martín-García, Beatriz, Moreels, Iwan, Zahn, Dietrich R. T., Lesnyak, Vladimir |
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| Format: | Article Journal |
| Terbitan: |
, 2018
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3582227 |
Daftar Isi:
- A three-step colloidal synthesis of near-infrared active Cu−In−Se (CISe)-based nanocrystals (NCs) via a sequential partial cation exchange has been realized in one pot. In the first step, binary highly copper deficient Cu2−xSe NCs were synthesized, followed by a partial cation exchange of copper to indium ions, yielding CISe NCs. This reaction allows for a precise control of the composition of the resulting NCs through a simple variation of the ratio between guest-cation precursors and parent NCs. To enhance the stability and the photoluminescence (PL) properties of the NCs, a subsequent ZnS shell was grown in the third step, resulting in CISeS/ZnS core/shell particles. At high reaction temperature of the shell growth, it is possible to obtain In-rich CISeS/ZnS NCs whose emission was shifted to the visible region.