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Fabrication of bismuth telluride nanoparticles using a chemical synthetic process and their thermoelectric evaluations

Title
Fabrication of bismuth telluride nanoparticles using a chemical synthetic process and their thermoelectric evaluations
Authors
Kim, ChamKim, Dong HwanHan, Yoon SooChung, Jong ShikPark, SangHaKim, Hoyoung
DGIST Authors
Kim, ChamKim, Dong HwanKim, Hoyoung
Issue Date
2011-12-25
Citation
Powder Technology, 214(3), 463-468
Type
Article
Article Type
Article
Keywords
Ascorbic AcidAscorbic AcidsBi2Te3BismuthBismuth CompoundsBismuth NitrateBismuth TellurideBismuth TelluriumChemical ProceduresChemical SynthesisComplexing AgentsControlled StudyCrystal StructureCrystalline StructureEdetic AcidElectric ConductivityElectric ResistanceElectrical ResistivityEthylene Diamine Tetra-Acetic AcidKetonesLight ScatteringMaterials TestingMolecular StabilityNano-Crystalline PowdersNano-Sized GrainsNanoanalysisNanocrystalNanofabricationNanoparticleNanoparticlesOrganic AcidsParticle SizePowderProcess DevelopmentSintered BodySinteringSpark Plasma SinteringSpark Plasma Sintering ProcessSynthesis (Chemical)Synthetic ProcessTelluriumTellurium CompoundsTellurium DerivativeTemperature DependenceThermal ConductivityThermo-Electric ApplicationThermo-Electric PerformanceThermo-ElectricsTransport PropertiesUnclassified DrugWater Based
ISSN
0032-5910
Abstract
Bismuth telluride nanoparticles for thermoelectric applications were successfully prepared via a water-based chemical reaction. In this process, we used both a complexing agent (ethylenediaminetetraacetic acid) and a reducing agent (ascorbic acid) to stabilize the bismuth precursor (Bi(NO3)3) in water and to favor the reaction with the reduced source of tellurium. The resulting powder was confirmed to range in size below ca. 100nm with the crystalline structure corresponding to the rhmobohedral Bi2Te3. We sintered the nanocrystalline powder via a spark plasma sintering process, thus we obtained the sintered body composed of nano-sized grains. Then, we measured some important transport properties (electrical resistivity, Seebeck coefficient, and thermal conductivity) of the sintered body to calculate its thermoelectric performance, the figure of merit. Finally, we discussed the effect of the nanostructure in the sintered body on the thermal conductivity. © 2011 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5380
DOI
10.1016/j.powtec.2011.08.049
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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