Heat-induced transformation of CdSe–CdS–ZnS core–multishell quantum dots by Zn diffusion into inner layers

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; Marijn A. van Huis

doi:10.1039/C4CC08647C

Heat-induced transformation of CdSe–CdS–ZnS core–multishell quantum dots by Zn diffusion into inner layers†

Anil O. Yalcin,*^a Bart Goris,^b Relinde J. A. van Dijk-Moes,^c Zhaochuan Fan,^d Ahmet K. Erdamar,^a Frans D. Tichelaar,^a Thijs J. H. Vlugt,^d Gustaaf Van Tendeloo,^b Sara Bals,^b Daniël Vanmaekelbergh,^c Henny W. Zandbergen^a and Marijn A. van Huis^e

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* Corresponding authors

^a Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
E-mail: a.o.yalcin@tudelft.nl

^b Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium

^c Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands

^d Process and Energy Laboratory, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands

^e Debye Institute for Nanomaterials Science, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands

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, Cd_xZn_1−xSe–Cd_yZn_1−yS core–shell QDs are obtained.

Chemical Communications

Heat-induced transformation of CdSe–CdS–ZnS core–multishell quantum dots by Zn diffusion into inner layers†

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Heat-induced transformation of CdSe–CdS–ZnS core–multishell quantum dots by Zn diffusion into inner layers

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