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Investigation of Reaction Mechanisms of Bismuth Tellurium Selenide Nanomaterials for Simple Reaction Manipulation Causing Effective Adjustment of Thermoelectric Properties

Title
Investigation of Reaction Mechanisms of Bismuth Tellurium Selenide Nanomaterials for Simple Reaction Manipulation Causing Effective Adjustment of Thermoelectric Properties
Authors
Kim, ChamKim, Dong HwanKim, Jong TaeHan, Yoon SooKim, Hoyoung
DGIST Authors
Kim, ChamKim, Dong HwanKim, Hoyoung
Issue Date
2014-01-22
Citation
ACS Applied Materials and Interfaces, 6(2), 778-785
Type
Article
Article Type
Article
Keywords
Ascorbic AcidBismuthBismuth Tellurium SelenideChemical ReactionChemical ReactionsElectric PropertiesElectron Transport PropertiesIonsNano-Structured MaterialspH ValueSelenidesSpark Plasma SinteringSpark Plasma Sintering ProcessTelluriumTellurium CompoundsThermo-Electric ApplicationThermo-Electric EquipmentThermo-Electric MaterialsThermo-Electric PerformanceThermo-Electric PropertiesThermo-Electric Transport PropertiesThermo-ElectricityTransport Properties
ISSN
1944-8244
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 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5269
DOI
10.1021/am405035z
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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