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Study of reaction mechanisms and synthetic manipulations of bismuth tellurium selenide nanomaterials for enhanced thermoelectric performance

Title
Study of reaction mechanisms and synthetic manipulations of bismuth tellurium selenide nanomaterials for enhanced thermoelectric performance
Authors
Kim, C[Kim, Cham]Kim, DH[Kim, Dong Hwan]Lee, YK[Lee, Yu Kyung]Kim, JT[Kim, Jong Tae]Han, YS[Han, Yoon Soo]Kim, H[Kim, Hoyoung]
DGIST Authors
Kim, C[Kim, Cham]Kim, DH[Kim, Dong Hwan]; Lee, YK[Lee, Yu Kyung]; Kim, JT[Kim, Jong Tae]; Kim, H[Kim, Hoyoung]
Issue Date
2014-01-25
Citation
Journal of Alloys and Compounds, 584, 108-113
Type
Article
Article Type
Article
Keywords
Ascorbic AcidBismuthBismuth Tellurium SelenideChemical SynthesisElectric PropertiesIonsNano-Structured MaterialsSelenidesSinteringSpark Plasma SinteringSpark Plasma Sintering ProcessSynthesis (Chemical)Synthetic ManipulationsTelluriumTellurium CompoundsThermo-ElectricThermo-Electric ApplicationThermo-Electric MaterialsThermo-Electric PerformanceThermo-Electric Transport PropertiesThermo-ElectricityTransport Properties
ISSN
0925-8388
Abstract
We synthesized ternary n-type bismuth tellurium selenide nanomaterials for thermoelectric applications via a water-based chemical reaction under an atmospheric environment. In this work, bismuth nitrate was employed as a bismuth precursor and was hydrolyzed to form bismuth hydroxide in an aqueous solution. Ascorbic acid was used to dissolve the bismuth hydroxide and give a reactive bismuth source (Bi3+ ions) that was able to react with anion sources (Te2-/Se2- ions). Ascorbic acid played a role in reducing bismuth hydroxide to an unreactive bismuth source (bismuth particles, Bi 0). We confirmed that ascorbic acid dissolved or reduced bismuth hydroxide depending on the solution pH. Because either Bi3+ ions or bismuth particles were generated depending on the pH, the nanomaterial stoichiometry was pH dependent. Nanomaterials prepared at various pH levels were individually sintered using a spark plasma sintering process to measure their thermoelectric transport properties (i.e., carrier concentration, electrical resistivity, Seebeck coefficient, and thermal conductivity). We observed how the transport properties were affected through adjustment of the pH of the reaction and found an appropriate pH for optimizing the transport properties, which resulted in enhancement of the thermoelectric performance. © 2013 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2401
DOI
10.1016/j.jallcom.2013.09.001
Publisher
Elsevier
Related Researcher
Files:
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Collection:
ETC1. Journal Articles


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