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Monitoring the multiphasic evolution of bismuth telluride nanoplatelets


Adjusting the synthetic route to control the shape, composition, and crystal structure of nanostructured topological insulators (TIs) is a challenge in the realization of TI systems with specific functionalities. Here, we report probing the multiphasic evolution of Bi2Te3 nanoplatelets primarily using microscopic, elemental, and crystallographic methods. An evolution model is proposed along which the nanoplatelets undergo compositional and morphological changes. These changes have pronounced impact on the electronic and thermoelectric properties of the initial, intermediate, and final stages of the model. The materials are synthesized via a solvothermal method, which depending on control of the precursors relative concentrations, ends up to multiphasic materials ranging from stoichiometric Bi2Te3 nanoplatelets, to Bi4Te3 and BiTe. Twin planes model appears to explain adequately the successive formation of different Bi-rich phases allowing control of morphological and electronic properties of the yield. Specifically, the initial formation of Bi-rich triangular nanoplatelets triggers the generation of additional twin planes and subsequently leads to the ultimate 2D growth of hexagonal bismuth telluride nanoplatelets. The findings of this study pave the way towards engineering novel nanostructured Bi−Te topological compounds with tailored properties.

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Article information

13 May 2020
04 Oct 2020
First published
08 Oct 2020

CrystEngComm, 2020, Accepted Manuscript
Article type

Monitoring the multiphasic evolution of bismuth telluride nanoplatelets

A. Subrati, Y. Kim, Y. F. AlWahedi, V. Tzitzios, J. B. Lee, S. M. Alhassan, H. J. Kim, S. Lee, I. Sakellis, N. Boukos, S. Stephen, S. M. Lee, M. Fardis and G. Papavassiliou, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/D0CE00719F

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