Crystallographically textured nanomaterials produced from the liquid phase sintering of BixSb₂-xTe₃ nanocrystal building blocks
Liu, Yu (Institut de Recerca en Energia de Catalunya)
Zhang, Yu (Institut de Recerca en Energia de Catalunya)
Ortega, Silvia (Institut de Recerca en Energia de Catalunya)
Ibáñez, Maria (ETH Zürich. Department of Chemistry and Applied Biosciences)
Lim, Khak Ho (Hong Kong University of Science and Technology. Department of Chemical and Biological Engineering)
Grau Carbonell, Albert (Institut Català de Nanociència i Nanotecnologia)
Martí-Sánchez, Sara (Institut Català de Nanociència i Nanotecnologia)
Ng, Ka Ming (Hong Kong University of Science and Technology. Department of Chemical and Biological Engineering)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Kovalenko, Maksym V. (ETH Zürich. Department of Chemistry and Applied Biosciences)
Cadavid, Doris (Institut de Recerca en Energia de Catalunya)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Data:	2018
Resum:	Bottom-up approaches for producing bulk nanomaterials have traditionally lacked control over the crystallographic alignment of nanograins. This limitation has prevented nanocrystal-based nanomaterials from achieving optimized performances in numerous applications. Here we demonstrate the production of nanostructured BixSb₂-xTe₃ alloys with controlled stoichiometry and crystallographic texture through proper selection of the starting building blocks and the adjustment of the nanocrystal-to-nanomaterial consolidation process. In particular, we hot pressed disk-shaped BixSb₂-xTe₃ nanocrystals and tellurium nanowires using multiple pressure and release steps at a temperature above the tellurium melting point. We explain the formation of the textured nanomaterials though a solution-reprecipitation mechanism under a uniaxial pressure. Additionally, we further demonstrate these alloys to reach unprecedented thermoelectric figures of merit, up to ZT = 1. 96 at 420 K, with an average value of ZT = 1. 77 for the record material in the temperature range 320-500 K, thus potentially allowing up to 60% higher energy conversion efficiencies than commercial materials.
Ajuts:	European Commission 306733 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Bulk nano-materials ; Commercial materials ; Consolidation process ; Controlled stoichiometry ; Crystallographic textures ; Optimized performance ; Tellurium nanowires ; Uniaxial pressures
Publicat a:	Nano letters, Vol. 18, issue 4 (April 2018) , p. 2557-2563, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.8b00263

Postprint 21 p, 1.2 MB

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