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Wet-chemical synthesis of enhanced-thermopower Bi1-xSbx nanowire composites for solid-state active cooling of electronics

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Abstract
In 1993, Hicks and Dresselhaus [Thermoelectric figure of merit of a one-dimensional conductor, Phys. Rev. B 47, 16631 (1993).] suggested that Bi nanowires could result in values of the thermoelectric figure of merit zT > 1. The Dresselhaus group also calculated a ternary phase diagram for Bi1-xSbx nanowires as a function of x and wire diameter. This manuscript reports a wet-chemical method to synthesize Bi1-xSbx-silica nanowire composites. Resistivity, Hall electron concentration, electron mobility, Seebeck and Nernst coefficients, and thermal conductivity of composites are measured and compared to bulk polycrystalline Bi1-xSbx samples prepared either by ingot casting or by the same wet chemistry but without nanostructuring. A clear increase of the thermopower in 20-nm Bi94Sb6-silica is reported when compared to bulk samples, and the values are among the highest found in the literature from 300 to 380 K, even though the electron concentration is higher than in the bulk. This suggests that consistent with theory, size quantization is responsible for the thermopower increase.
Keywords
BI-SB ALLOYS, QUANTUM-NUMBER LIMIT, TRANSPORT-PROPERTIES, THERMOELECTRIC FIGURE, BISMUTH NANOWIRES, MERIT, MAGNETOREFLECTION, ARRAYS, POWER

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Chicago
Vandaele, Koen, Bin He, Pascal Van Der Voort, Klaartje De Buysser, and JP Heremans. 2018. “Wet-chemical Synthesis of Enhanced-thermopower Bi1-xSbx Nanowire Composites for Solid-state Active Cooling of Electronics.” Physical Review Applied 9 (2).
APA
Vandaele, Koen, He, B., Van Der Voort, P., De Buysser, K., & Heremans, J. (2018). Wet-chemical synthesis of enhanced-thermopower Bi1-xSbx nanowire composites for solid-state active cooling of electronics. PHYSICAL REVIEW APPLIED, 9(2).
Vancouver
1.
Vandaele K, He B, Van Der Voort P, De Buysser K, Heremans J. Wet-chemical synthesis of enhanced-thermopower Bi1-xSbx nanowire composites for solid-state active cooling of electronics. PHYSICAL REVIEW APPLIED. 2018;9(2).
MLA
Vandaele, Koen, Bin He, Pascal Van Der Voort, et al. “Wet-chemical Synthesis of Enhanced-thermopower Bi1-xSbx Nanowire Composites for Solid-state Active Cooling of Electronics.” PHYSICAL REVIEW APPLIED 9.2 (2018): n. pag. Print.
@article{8555182,
  abstract     = {In 1993, Hicks and Dresselhaus [Thermoelectric figure of merit of a one-dimensional conductor, Phys. Rev. B 47, 16631 (1993).] suggested that Bi nanowires could result in values of the thermoelectric figure of merit zT {\textrangle} 1. The Dresselhaus group also calculated a ternary phase diagram for Bi1-xSbx nanowires as a function of x and wire diameter. This manuscript reports a wet-chemical method to synthesize Bi1-xSbx-silica nanowire composites. Resistivity, Hall electron concentration, electron mobility, Seebeck and Nernst coefficients, and thermal conductivity of composites are measured and compared to bulk polycrystalline Bi1-xSbx samples prepared either by ingot casting or by the same wet chemistry but without nanostructuring. A clear increase of the thermopower in 20-nm Bi94Sb6-silica is reported when compared to bulk samples, and the values are among the highest found in the literature from 300 to 380 K, even though the electron concentration is higher than in the bulk. This suggests that consistent with theory, size quantization is responsible for the thermopower increase.},
  articleno    = {024020},
  author       = {Vandaele, Koen and He, Bin and Van Der Voort, Pascal and De Buysser, Klaartje and Heremans, JP},
  issn         = {2331-7019},
  journal      = {PHYSICAL REVIEW APPLIED},
  language     = {eng},
  number       = {2},
  pages        = {12},
  title        = {Wet-chemical synthesis of enhanced-thermopower Bi1-xSbx nanowire composites for solid-state active cooling of electronics},
  url          = {http://dx.doi.org/10.1103/PhysRevApplied.9.024020},
  volume       = {9},
  year         = {2018},
}

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