Drs. Anil O. Yalcin

Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

Authors | Anil O. Yalcin, Bart Goris, Relinde J. A. van Dijk-Moes, Zhaochuan Fan, Ahmet K. Erdamar, Frans D. Tichelaar, Thijs J. H. Vlugt, Gustaaf  Van Tendeloo, Sara Bals, Daniël Vanmaekelbergh, Henny W. Zandbergen and   Marijn A. van Huis. Email | A.O.Yalcin@tudelft.nl

ApplicationHeat-induced Transformation of CdSe–CdS–ZnS Core–multishell Quantum Dots by Zn Diffusion into Inner Layers
AuthorsAnil O. Yalcin, Bart Goris, Relinde J. A. van Dijk-Moes, Zhaochuan Fan, Ahmet K. Erdamar, Frans D. Tichelaar, Thijs J. H. Vlugt, Gustaaf  Van Tendeloo, Sara Bals, Daniël Vanmaekelbergh, Henny W. Zandbergen and   Marijn A. van Huis.
JournalChem. Commun., 2015,51, 3320-3323
PublicationFull Publication Here – DOI: 10.1039/C4CC08647C

 

Heat-induced Transformation of CdSe–CdS–ZnS Core–multishell Quantum Dots by Zn Diffusion into Inner Layers

ABSTRACT: In this work, we investigate the thermal evolution of CdSe–CdS–ZnS core–multishell quantum dots (QDs) in situ using transmission electron microscopy (TEM). Starting at a temperature of approximately 250 °C, Zn diffusion into inner layers takes place together with simultaneous evaporation of particularly Cd and S. As a result of this transformation, CdxZn1−xSe–CdyZn1−yS core–shell QDs are obtained.

Figure Right: (a) HAADF-STEM image of CdSe–CdS–ZnS core–multishell QDs at their initial state at RT. (b–f) The corresponding Se, S, Cd and Zn elemental maps and an overlay of the Cd and Zn elemental maps obtained by EDX mapping. The scale bar in (a) applies also to (b–f). (g and h) HRTEM images of two QDs along two different zone axes.

Figure below: (a) HAADF-STEM image of QDs at 275 1C. (b–f) The corresponding Se, S, Cd and Zn elemental maps and an overlay of the Cd and Zn elemental maps obtained by EDX mapping. Elemental maps indicate that CdSe–CdS–ZnS QDs transformed into CdxZn1xSe–CdyZn1yS core–shell structures by Zn diffusion into the inner layers. The scale bar in (a) applies also to (b–f).

Figure below: High resolution HAADF-STEM study of a QD during thermal evolution at temperatures of (a) 120 1C, (b) 270 1C, and (c) 310 1C. The FT of each image is placed below the image. The scale bars in (a) and in thecorresponding FT apply to all images and FTs. .

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