Surface functionalization of surfactant-free particles : a strategy to tailor the properties of nanocomposites for enhanced thermoelectric performance
Chang, Cheng (Institute of Science and Technology Austria)
Liu, Yu (Institute of Science and Technology Austria)
Lee, Seung Ho (Institute of Science and Technology Austria)
Spadaro, Maria Chiara (Institute of Science and Technology Austria)
Koskela, Kristopher M. (University of Southern California. Department of Chemistry)
Kleinhanns, Tobias (Institute of Science and Technology Austria)
Costanzo, Tommaso (Institute of Science and Technology Austria)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Brutchey, Richard L. (University of Southern California. Department of Chemistry)
Ibáñez, Maria (Institute of Science and Technology Austria)

Data:	2022
Resum:	The broad implementation of thermoelectricity requires high-performance and low-cost materials. One possibility is employing surfactant-free solution synthesis to produce nanopowders. We propose the strategy of functionalizing "naked" particles' surface by inorganic molecules to control the nanostructure and, consequently, thermoelectric performance. In particular, we use bismuth thiolates to functionalize surfactant-free SnTe particles' surfaces. Upon thermal processing, bismuth thiolates decomposition renders SnTe-BiS nanocomposites with synergistic functions: 1) carrier concentration optimization by Bi doping; 2) Seebeck coefficient enhancement and bipolar effect suppression by energy filtering; and 3) lattice thermal conductivity reduction by small grain domains, grain boundaries and nanostructuration. Overall, the SnTe-BiS nanocomposites exhibit peak z T up to 1. 3 at 873 K and an average z T of ≈0. 6 at 300-873 K, which is among the highest reported for solution-processed SnTe.
Ajuts:	European Commission 754411 Ministerio de Economía y Competitividad SEV-2017-0706 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327
Nota:	Altres ajuts: MCS acknowledge MINECO Juan de la Cierva Incorporation fellowship (JdlCI 2019) and Severo Ochoa. ICN2 is funded by the CERCA Programme/Generalitat de Catalunya. This study was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and Generalitat de Catalunya.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Thermoelectrics ; SnTe ; Grain boundary ; Alkahest solutions ; Surface functionalization
Publicat a:	Angewandte Chemie (International ed. Internet), Vol. 61, issue 35 (Aug. 2022) , art. e202207002, ISSN 1521-3773

DOI: 10.1002/anie.202207002
PMID: 35799379

7 p, 3.9 MB

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