Abstract
Hollow spheres made of Bi2Te3 nanoplatelets were successfully synthesized using a low temperature, wet chemical synthesis route. By using a one-pot synthesis, large quantities of microspheres, arranged in a gypsum flower manner, can be obtained in about 1 h. The mechanism leading to such a particular morphology has been deeply studied by both solid and solution characterization techniques (X-ray diffraction, scanning and transmission electron microscopy, X-ray fluorescence, 1H nuclear magnetic resonance spectroscopy) which were carried out at different stages of the synthesis. The key points are the generation of alcanethiol-in-polyol droplets and the subsequent in situ controlled interfacial reaction between Te and Bi precursors. The Te(IV) ions present in the alcanethiol phase are initially reduced into Te(0) by decanethiol. The Bi(III) ions initially dissolved in the polyol phase are then reduced at the decanethiol/polyol interface, resulting in the progressive growth of Bi2Te3 hexagonal nanoplatelets at the outer surface of the pristine Te(0) sphere.
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Acknowledgments
We would like to thank the following persons for their help in materials characterization: Patricia Beaunier for TEM, Hélène Lecoq for SEM, Philippe Decorse for XPS, and Marco Faustini and Jean-Yves Piquemal for fruitful discussions.
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Fouineau, J., Peron, J., Nowak, S. et al. Soft chemistry synthesis route toward Bi2Te3 hierarchical hollow spheres. J Nanopart Res 17, 166 (2015). https://doi.org/10.1007/s11051-015-2968-7
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DOI: https://doi.org/10.1007/s11051-015-2968-7