Influence of Nanoparticle Processing on the Thermoelectric Properties of (Bi_xSb_1−X)₂Te₃ Ternary Alloys

Abstract

The synthesis of phase‐pure ternary solutions of tetradymite‐type materials (BixSb1−x)2Te3 (x=0.25; 0.50; 0.75) in an ionic liquid approach has been carried out. The nanoparticles are characterized by means of energy‐dispersive X‐ray spectroscopy (EDX), powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), and transmission electron microscopy. In addition, the role of different processing approaches on the thermoelectric properties ‐ Seebeck coefficient as well as electrical and thermal conductivity ‐ is demonstrated.

Organic/Inorganic Hybrid Design as a Route for Promoting the Bi0.5Sb1.5Te3 for High‐Performance Thermoelectric Power Generation

“…[4,5] Bismuth telluride (Bi 2 Te 3 ) and its alloys are state-of-the-art room-temperature TE materials, and are quite promising for low-grade waste heat recovery. [6][7][8][9][10][11] Persistent efforts have been devoted to improving their zT values, including manipulation of the fabrication processes, [12,13] fine-tuning the chemical doping, [14][15][16][17][18][19][20][21][22][23][24][25][26][27] and nanostructuring. [13] In particular, enhanced average zTs have been obtained in Bi 2 Te 3 -based composites with various kinds of nano-carbon materials, for example, carbon nanotubes, [28][29][30] carbon fibers, [31] and nano-SiC.…”

Ultra-mild synthesis of nanometric metal chalcogenides using organyl chalcogenide precursors

“…102 Similarly, reactions of (Et 3 Si) 2 E with bismuth-containing ionic liquids [Cat] 3 [Bi 3 I 12 ] [Cat = C 4 C 1 Im or C 4 mim] in the presence of oleylamine at 150 °C afforded phase-pure Bi 2 E 3 (E = Se, Te). 68,102,103 Alternatively, these silylated organyl chalcogenides (R 3 Si) 2 E can easily be converted to chalcogenide-containing ionic liquids Cat + [ESiMe 3 ] − (Cat + = an organic cation) of comparable activity but with higher thermal stability, therefore effectively suppressing the undesired homolytic cleavage of the E–Si bond observed occasionally in the parent (R 3 Si) 2 E. 104 For instance, [C 4 C 1 Pyr][ESiMe 3 ] (C 4 C 1 Pyr = 1-butyl-1-methylpyrrolidinium; E = Se or Te) reacts with bismuth-containing [C 4 C 1 Im] 3 [Bi 3 I 12 ] in [C 4 C 1 Im]I at 150 °C to afford phase-pure Bi 2 E 3 free from any elemental Se/Te impurities. 105…”