Faculty Profiles - ITOH Takashi

Papers - ITOH Takashi

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Effect of Filling of Mg and Addition of Alumina Nanoparticles on Thermoelectric Properties of N-type La Filled CoSb₃ Compounds Reviewed

M. Matsuhara, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 page： 237 2011.12

Thermoelectric Properties of n-type La-Mg Double Filled CoSb₃ Compounds Synthesized by MA-PDS Reviewed

T. Maruyama, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society Vol. 2 page： 15-16 2011.11

Synthesis of Higher Manganese Silicide and It's Thermoelectric Property Reviewed

N. Ono, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society Vol. 2 page： 11-12 2011.11

Thermoelectric Properties and Durability of Mg₂Si-Based Compounds Synthesized Using Magnesium Alloy Reviewed

K. Hagio, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society Vol. 2 page： 13-14 2011.11

Thermoelectric Properties of Mg₂Si-based Compounds Synthesized Partially Using Magnesium Alloy Reviewed

T. Itoh, K. Hagio

Proc. 9th European Conference on Thermoelectrics page： CD-ROM B_39_P 2011.9

Development of Thermal Rectifier Usable at High Temperature Reviewed

T. Takeuchi, H. Goto, Y. Toyama, T. Itoh, M. Mikami

J. Electronic Materials Vol. 40 ( 5 ) page： 1129-1135 2011.5

Thermoelectric Properties of Carbon Nanotubes Added n-type CoSb₃ Compound Reviewed

T. Itoh, M. Tachikawa

Mater. Res. Soc. Symp. Proc. Vol. 1314 2011.5

Synthesis of Bi₂Te₃ Nanosheets using Polyol Process Reviewed

S. Nishiwaki, T. Itoh

IOP Conference Series: Materials Science and Engineering Vol. 18 2011.1

Thermoelectric Properties of Carbon Nanotubes Added n-type CoSb₃ Compound

T. Itoh and M. Tachikawa

2010 MRS Fall Meeting Abstracts page： CD-ROM ID:911936 2010.12

Fabrication and Thermoelectric Properties of Eco-Friendly Silicides for Thermoelectric Power Generation Using Waste Heat Reviewed

T. Itoh

Transactions of JWRI Vol. 39 ( 2 ) page： 276-278 2010.12

Synthesis of Bi₂Te₃ Nanosheets Using Polyol Process Reviewed

S. Nishiwaki and T. Itoh

3rd International Congress on Ceramics Abstracts page： CD-ROM, S9C-P019 2010.11

Fabrication and Thermoelectric Properties of Eco-Friendly Silicides for Thermoelectric Power Generation Using Waste Heat Reviewed

T. Itoh

The International Symposium on Advanced Materials Development and Integration of Novel Structured Metallic and Inorganic Materials Proc. page： 283-284 2010.11

Synthesis of Thermoelectric Bi-Sb Alloy by Liquid-Solid Phase Reaction Method Reviewed

S. Nishiwaki and T. Itoh

29th International Conference on Thermoelectric Abstracts page： 191 2010.6

Effect of Silicon Content on Thermoelectric Properties of Higher Manganese Silicide Compounds Prepared by Mechanical Grinding and Pulse Discharge Sintering

T. Itoh and M. Yoshikura

29th International Conference on Thermoelectric Abstracts page： 165 2010.6

ＭＧ－ＰＤＳ法で合成した高マンガンシリサイド化合物の熱電特性 Reviewed

吉倉雅晶，伊藤孝至

粉体および粉末冶金 Vol. 57 ( 4 ) page： 242-246 2010.4

修正ポリオールプロセスによる熱電Bi-Sb合金のナノ粒子合成 Reviewed

田中裕介,　伊藤孝至

粉体および粉末冶金 Vol. 57 ( 4 ) page： 252-256 2010.4

Effect of Alumina Nanoparticles Additions on Thermoelectric Properties of n-type CoSb₃ Compound Fabricated by Pulse Discharge Sintering Method Reviewed

Vol. 36 ( 2 ) page： 85-89 2010.3

Language：Japanese Publishing type：Research paper (scientific journal)

Thermoelectric power generation is a promising green energy system recovering waste heat. CoSb₃ skutterudite compound is a candidate material for thermoelectric power generation. For improving thermoelectric performance of the material, it is necessary to lower the thermal conductivity. In this work, Al₂O₃ nanoparticles were added and dispersed by mechanical grinding (MG) into n-type CoSb₃ compound prepared by pulse discharge sintering (PDS) method. Over long MG treatment brought high electrical resistivity, lowering thermoelectric performance of the Al₂O₃ nanoparticles added CoSb₃ compound. Seebeck coefficient almost did not change regardless of additional amount of Al₂O₃ nanoparticles. Increasing additional amount of Al₂O₃ nanoparticles brought increasing electrical resistivity and decreasing thermal conductivity. It is found that there is an optimal additional amount of Al₂O₃ nanoparticles that leads to improvement of thermoelectric performance of the CoSb₃ compound. The maximum thermoelectric performance (ZT=0.58) was achieved at 684K in the CoSb₃ compound including Al₂O₃ nanoparticles of 0.1mass%.

Development of Materials and Modules for Thermoelectric Power Generation Recovering Waste Heat Invited

T. Itoh

Abstracts of The 15th ATA Symposium (International Green Energy Conference) page： L-06 2009.11

Authorship：Lead author Language：English

The waste heat with intermediate temperature (300-600 oC) is discharged from many kinds of combustion systems, and the thermoelectric power generation is the most effective means for its recovery. Thus, the developments of the thermoelectric materials and modules working effectively in this temperature range are required. We developed the thermoelectric materials and modules for the thermoelectric power generation recovering the waste heat

Syntheses of Ni-doped and Fe-doped CoSb₃ Thermoelectric Nanoparticles through Modified Polyol Process Reviewed

T. Itoh and K. Isogai

Mater. Res. Soc. Symp. Proc. Vol. 1166 page： 135-140 2009.11

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Skutterudite CoSb₃ compounds are of increasing interest as materials with good thermoelectric performance over the temperature range of 600 to 800 K, but the thermal conductivity of the materials is relatively high. Nanostructured materials have been shown to enhance phonon scattering and lower the thermal conductivity of the thermoelectric materials. Partial substitution of Ni or Fe on the Co site of CoSb₃ is a hopeful route for improving thermoelectric performance of the CoSb₃ compounds. In the present work, synthesis of Ni-doped and Fe-doped CoSb₃ nanoparticles through the modified polyol process was attempted and the optimum synthesizing condition was investigated. Co(OOCH₃)₂·4H₂O, Ni(OOCH₃)₂·4H₂O, FeCl₃·6H₂O and SbCl₃, were prepared as precursors. The precursors were reduced by NaBH₄ in tetraethyleneglycol at 513 K in an argon atmosphere, for different reaction times (holding times). The reaction products were characterized by the X-ray diffraction, the energy dispersive X-ray spectroscopy, and transmission electron microscopy. The nanoparticles with about 20 to 30 nm in size mainly existed in the reaction products regardless of the chemical composition and the reaction time. The skutterudite phase was identified as a main phase in the sample synthesized for long reaction time, but the other phases of Sb and MSb₂ (M=Co, Ni, Fe) were also detected. The lattice parameter of the synthesized skutterudite phase linearly increased with increasing the doping agent concentration, following Vegard's law.

Synthesis of thermoelectric Bi-Sb alloy nanoparticles Reviewed

Y. Tanaka, T. Itoh

Abstracts of R'09 Twin World Congress page： 78 2009.10

Language：English

Binary Bi-Sb alloy is a material with an excellent thermoelectric performance in the low temperature region below 0 oC. It is a hopeful candidate material for thermoelectric power conversion using cold heat resource. Bi-Sb alloy is a complete solid solution. However, its synthesis is difficult in the fusion method due to gravity segregation, and its single crystal is very brittle. No segregation, high mechanical strength and low thermal conductivity are required for the thermoelectric Bi-Sb alloy. These properties can be achieved by making up a polycrystalline body from nanosized Bi-Sb alloy particles. In this study, we attempted to synthesize the nanoparticles of thermoelectric Bi-Sb alloy through a modified polyol process. Two kinds of materials, Bi( NO3)3.5H2O (1mmol) and SbCl3 (1mmol) were dissolved in tetraethyleneglycole (TEG, 20ml) as a solvent by sonicating. After the solution was bubbled with Ar gas and strongly agitated at room temperature, a reducing agent NaBH4 (320 mg) dissolved in TEG (10 ml) was added slowly, and the Bi-Sb alloy was synthesized by heating to 180 oC in Ar gas. The synthesized particles in the solution were settled by centrifugation, washed with ethanol and TEG, and dried under a vacuum. The syntheses of Bi-Sb alloy nanoparticles were also attempted in various experimental conditions. The reaction products were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). A single phase of Bi-rich Bi-Sb alloy was identified by XRD analysis. Agglomerate of the Bi-Sb alloy particles with nano-order size were confirmed by TEM observation.

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