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Research Output 1991 2019

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2019
2 Citations (Scopus)

Atomic-scale phonon scatterers in thermoelectric colusites with a tetrahedral framework structure

Suekuni, K., Shimizu, Y., Nishibori, E., Kasai, H., Saito, H., Yoshimoto, D., Hashikuni, K., Bouyrie, Y., Chetty, R., Ohta, M., Guilmeau, E., Takabatake, T., Watanabe, K. & Ohtaki, M., Jan 1 2019, In : Journal of Materials Chemistry A. 7, 1, p. 228-235 8 p.

Research output: Contribution to journalArticle

Chalcogenides
Thermal conductivity
Crystal structure
Sulfur
Defects

Electronic structure and thermoelectric properties of Sn1.2- xNb x Ti0.8S3 with a quasi-one-dimensional structure

Suekuni, K., Usui, H., Qiao, S., Hashikuni, K., Hirano, T., Nishiate, H., Lee, C. H., Kuroki, K., Watanabe, K. & Ohtaki, M., May 7 2019, In : Journal of Applied Physics. 125, 17, 175111.

Research output: Contribution to journalArticle

Open Access
ribbons
electronic structure
electrons
Seebeck effect
occupation
1 Citation (Scopus)

Thermoelectric Properties and Electronic Structures of CuTi 2 S 4 Thiospinel and Its Derivatives: Structural Design for Spinel-Related Thermoelectric Materials

Hashikuni, K., Suekuni, K., Usui, H., Chetty, R., Ohta, M., Kuroki, K., Takabatake, T., Watanabe, K. & Ohtaki, M., Jan 22 2019, In : Inorganic Chemistry. 58, 2, p. 1425-1432 8 p.

Research output: Contribution to journalArticle

structural design
thermoelectric materials
Structural design
spinel
Electronic structure
2018
3 Citations (Scopus)

Carrier concentration tuning in thermoelectric thiospinel Cu 2 CoTi 3 S 8 by oxidative extraction of copper

Hashikuni, K., Suekuni, K., Watanabe, K., Bouyrie, Y., Ohta, M., Ohtaki, M. & Takabatake, T., Mar 1 2018, In : Journal of Solid State Chemistry. 259, p. 5-10 6 p.

Research output: Contribution to journalArticle

Carrier concentration
Copper
Tuning
tuning
copper
2 Citations (Scopus)

Low Thermal Conductivity of RE-Doped SrO(SrTiO3)1 Ruddlesden Popper Phase Bulk Materials Prepared by Molten Salt Method

Putri, Y. E., Said, S. M., Refinel, R., Ohtaki, M. & Syukri, S., Sep 1 2018, In : Electronic Materials Letters. 14, 5, p. 556-562 7 p.

Research output: Contribution to journalArticle

Molten materials
Thermal conductivity
Salts
Phonon scattering
Seebeck coefficient
2016
1 Citation (Scopus)
tungsten oxides
Alkalies
iron oxides
Oxides
Tungsten
2014
26 Citations (Scopus)

Effects of morphology on the thermoelectric properties of Al-doped ZnO

Han, L., Van Nong, N., Zhang, W., Hung, L. T., Holgate, T., Tashiro, K., Ohtaki, M., Pryds, N. & Linderoth, S., Mar 11 2014, In : RSC Advances. 4, 24, p. 12353-12361 9 p.

Research output: Contribution to journalArticle

Platelets
Nanoparticles
Spark plasma sintering
Powders
Thermal conductivity
2013
8 Citations (Scopus)

Extremely low thermal conductivity in oxides with cage-like crystal structure

Ohtaki, M. & Miyaishi, S., Jul 1 2013, In : Journal of Electronic Materials. 42, 7, p. 1299-1302 4 p.

Research output: Contribution to journalArticle

Oxides
Cations
Thermal conductivity
thermal conductivity
Crystal structure
9 Citations (Scopus)

La doped effects on structure and thermoelectric properties of Sr 2 MnMoO 6 double-perovskite oxides

Sugahara, T., Ohtaki, M. & Suganuma, K., Jan 1 2013, In : Journal of Asian Ceramic Societies. 1, 3, p. 282-288 7 p.

Research output: Contribution to journalArticle

Perovskite
Oxides
Temperature
Rietveld refinement
Seebeck coefficient
8 Citations (Scopus)

Synthesis and self-assembly of gold nanoparticles by chemically modified polyol methods under experimental control

Viet Long, N., Ohtaki, M., Yuasa, M., Yoshida, S., Kuragaki, T., Minh Thi, C. & Nogami, M., Apr 5 2013, In : Journal of Nanomaterials. 2013, 793125.

Research output: Contribution to journalArticle

Polyols
Gold
Self assembly
Nanoparticles
Surface plasmon resonance
27 Citations (Scopus)

The influence of α- And γ-Al2O3 phases on the thermoelectric properties of Al-doped ZnO

Han, L., Nong, N. V., Hung, L. T., Holgate, T., Pryds, N., Ohtaki, M. & Linderoth, S., Apr 5 2013, In : Journal of Alloys and Compounds. 555, p. 291-296 6 p.

Research output: Contribution to journalArticle

Calcination
Doping (additives)
Microstructure
Spark plasma sintering
Grain growth
2012
11 Citations (Scopus)

Controlled synthesis and properties of palladium nanoparticles

Long, N. V., Hayakawa, T., Matsubara, T., Chien, N. D., Ohtaki, M. & Nogami, M., Jan 1 2012, In : Journal of Experimental Nanoscience. 7, 4, p. 426-439 14 p.

Research output: Contribution to journalArticle

Palladium
Nanoparticles
Ethylene Glycol
Ethylene glycol
Sodium Iodide
2 Citations (Scopus)
Platinum
Nanostructures
platinum
Nucleation
roughness
33 Citations (Scopus)

New experimental evidences of Pt-Pd bimetallic nanoparticles with core-shell configuration and highly fine-ordered nanostructures by high-resolution electron transmission microscopy

Nguyen, V. L., Ohtaki, M., Matsubara, T., Cao, M. T. & Nogami, M., Jun 7 2012, In : Journal of Physical Chemistry C. 116, 22, p. 12265-12274 10 p.

Research output: Contribution to journalArticle

High resolution transmission electron microscopy
Nanostructures
Nanoparticles
nanoparticles
transmission electron microscopy
24 Citations (Scopus)
Chemical engineering
Agglomeration
Nanoparticles
Nanostructures
Polymers
9 Citations (Scopus)

Sharp cubic and octahedral morphologies of poly(vinylpyrrolidone)-stabilised platinum nanoparticles by polyol method in ethylene glycol: Their nucleation, growth and formation mechanisms

Long, N. V., Chien, N. D., Hayakawa, T., Matsubara, T., Ohtaki, M. & Nogami, M., Mar 1 2012, In : Journal of Experimental Nanoscience. 7, 2, p. 133-149 17 p.

Research output: Contribution to journalArticle

Ethylene Glycol
Polyols
Ethylene glycol
Platinum
Nucleation
14 Citations (Scopus)

Structure and morphology of platinum nanoparticles with critical new issues of low- and high-index facets

Long, N. V., Ohtaki, M., Ngo, V. N., Cao, M. T. & Nogami, M., Jan 1 2012, In : Advances in Natural Sciences: Nanoscience and Nanotechnology. 3, 2, 025005.

Research output: Contribution to journalArticle

Platinum
Nanoparticles
Silver Nitrate
Direct methanol fuel cells (DMFC)
Polyols
12 Citations (Scopus)

Structure and thermoelectric properties of Ca 2-xSr xFeMoO 6 (0 ≤ x ≤ 0.3) double-perovskite oxides

Sugahara, T., Van Nong, N. & Ohtaki, M., Apr 16 2012, In : Materials Chemistry and Physics. 133, 2-3, p. 630-634 5 p.

Research output: Contribution to journalArticle

Perovskite
Oxides
oxides
Substitution reactions
Temperature
12 Citations (Scopus)

Structure and thermoelectric properties of double-perovskite oxides: Sr2-xKxFeMoO6

Sugahara, T., Araki, T., Ohtaki, M. & Suganuma, K., Jan 1 2012, In : Journal of the Ceramic Society of Japan. 120, 1402, p. 211-216 6 p.

Research output: Contribution to journalArticle

Perovskite
Oxides
oxides
Doping (additives)
Temperature
2011
51 Citations (Scopus)

A comparative study of Pt and Pt-Pd core-shell nanocatalysts

Long, N. V., Ohtaki, M., Hien, T. D., Randy, J. & Nogami, M., Oct 30 2011, In : Electrochimica Acta. 56, 25, p. 9133-9143 11 p.

Research output: Contribution to journalArticle

Nanoparticles
Nanoshells
Direct methanol fuel cells (DMFC)
Nanostructures
Electrocatalysis
46 Citations (Scopus)

Effects of heat treatment and poly(vinylpyrrolidone) (PVP) polymer on electrocatalytic activity of polyhedral Pt nanoparticles towards their methanol oxidation

Long, N. V., Ohtaki, M., Nogami, M. & Hien, T. D., Aug 2011, In : Colloid and Polymer Science. 289, 12, p. 1373-1386 14 p.

Research output: Contribution to journalArticle

Methanol
heat treatment
methyl alcohol
Heat treatment
Nanoparticles
173 Citations (Scopus)

Enhancement of the thermoelectric performance of p-type layered oxide Ca3Co4O9+δ through heavy doping and metallic nanoinclusions

Van Nong, N., Pryds, N., Linderoth, S. & Ohtaki, M., Jun 3 2011, In : Advanced Materials. 23, 21, p. 2484-2490 7 p.

Research output: Contribution to journalArticle

Oxides
Doping (additives)
High temperature testing
Heavy Ions
Heavy ions
14 Citations (Scopus)

Highly monodisperse cubic and octahedral rhodium nanocrystals: Their evolutions from sharp polyhedrons into branched nanostructures and surface-enhanced Raman scattering

Long, N. V., Chien, N. D., Hirata, H., Matsubara, T., Ohtaki, M. & Nogami, M., Apr 1 2011, In : Journal of Crystal Growth. 320, 1, p. 78-89 12 p.

Research output: Contribution to journalArticle

Rhodium
polyhedrons
rhodium
Nanocrystals
Raman scattering
17 Citations (Scopus)

High-temperature thermoelectric and microstructural characteristics of cobalt-based oxides with ga substituted on the Co-site

Nong, N. V., Yanagiya, S., Monica, S., Pryds, N. & Ohtaki, M., May 1 2011, In : Journal of Electronic Materials. 40, 5, p. 716-722 7 p.

Research output: Contribution to journalArticle

Cobalt
Oxides
Substitution reactions
cobalt
substitutes
77 Citations (Scopus)

High-temperature thermoelectric properties of late rare earth-doped Ca 3Co4O9+δ

Nong, N. V., Liu, C. J. & Ohtaki, M., Jan 21 2011, In : Journal of Alloys and Compounds. 509, 3, p. 977-981 5 p.

Research output: Contribution to journalArticle

Seebeck coefficient
Rare earths
Thermal conductivity
Solid state reactions
Oxides
18 Citations (Scopus)
cobalt oxides
transition metals
oxides
operating temperature
stabilization
16 Citations (Scopus)
Surface Morphology
Fuel Cell
fuel cells
Nanoparticles
Surface morphology
44 Citations (Scopus)

Synthesis and characterization of polyhedral Pt nanoparticles: Their catalytic property, surface attachment, self-aggregation and assembly

Long, N. V., Ohtaki, M., Uchida, M., Jalem, R., Hirata, H., Chien, N. D. & Nogami, M., Jul 15 2011, In : Journal of Colloid And Interface Science. 359, 2, p. 339-350 12 p.

Research output: Contribution to journalArticle

Surface properties
Agglomeration
Nanoparticles
Catalysts
Direct methanol fuel cells (DMFC)
114 Citations (Scopus)
Direct methanol fuel cells (DMFC)
fuel cells
Nanostructures
methyl alcohol
Nanoparticles
24 Citations (Scopus)

Synthesis and characterization of Pt-Pd nanoparticles with core-shell morphology: Nucleation and overgrowth of the Pd shells on the as-prepared and defined Pt seeds

Long, N. V., Hien, T. D., Asaka, T., Ohtaki, M. & Nogami, M., Jul 21 2011, In : Journal of Alloys and Compounds. 509, 29, p. 7702-7709 8 p.

Research output: Contribution to journalArticle

Seed
Nucleation
Nanoparticles
Transmission electron microscopy
High resolution transmission electron microscopy
7 Citations (Scopus)

Thermoelectric properties and thermopower enhancement of Al-doped ZnO with nanosized pore structure

Ohtaki, M. & Araki, K., Jan 1 2011, In : Journal of the Ceramic Society of Japan. 119, 1395, p. 813-816 4 p.

Research output: Contribution to journalArticle

Phonon scattering
Thermoelectric power
Polymethyl Methacrylate
Pore structure
Thermal conductivity
2010
37 Citations (Scopus)

Chemical synthesis and characterization of palladium nanoparticles

Long, N. V., Nguyen, D. C., Hirata, H., Ohtaki, M., Hayakawa, T. & Nogami, M., Jan 1 2010, In : Advances in Natural Sciences: Nanoscience and Nanotechnology. 1, 3, 035012.

Research output: Contribution to journalArticle

Palladium
Nanoparticles
Povidone
Polyols
Ethylene Glycol
72 Citations (Scopus)

Improvement on the high temperature thermoelectric performance of Ga-doped misfit-layered Ca3Co4-xGaxO9+δ (x = 0, 0.05, 0.1, and 0.2)

Nong, N. V., Liu, C. J. & Ohtaki, M., Feb 18 2010, In : Journal of Alloys and Compounds. 491, 1-2, p. 53-56 4 p.

Research output: Contribution to journalArticle

Substitution reactions
Thermoelectric power
Hot pressing
Solid state reactions
Oxides

熱-電気直接エネルギー変換のための酸化物熱電材料 (研究特集)

Translated title of the contribution: Oxide thermoelectric materials for heat-to-electricity direct energy conversion大瀧倫卓, Apr 2010, In : 九州大学グローバルCOEプログラム新炭素資源学ニューズレター. 3, p. 10-15 6 p.

Research output: Contribution to journalArticle

2009
246 Citations (Scopus)

High thermoelectric performance of dually doped ZnO ceramics

Ohtaki, M., Araki, K. & Yamamoto, K., Jul 1 2009, In : Journal of Electronic Materials. 38, 7, p. 1234-1238 5 p.

Research output: Contribution to journalArticle

Oxides
ceramics
oxides
Thermal conductivity
thermal conductivity
2008

Aサイト置換したダブルペロブスカイト型酸化物A₂B´MoO₆の熱電特性

Translated title of the contribution: Thermoelectric Properties of Double-perovskite Oxide A2 B'MoO6 with A-site Substitution菅原徹, 大瀧倫卓 & 相馬岳, Jun 2008, In : 九州大学大学院総合理工学報告. 30, 1, p. 8-13 6 p.

Research output: Contribution to journalArticle

25 Citations (Scopus)

Thermoelectric properties of double-perovskite oxide Sr2-xM xFeMoO6 [M = Ba, La)

Sugahara, T., Ohtaki, M. & Souma, T., Jan 1 2008, In : Journal of the Ceramic Society of Japan. 116, 1360, p. 1278-1282 5 p.

Research output: Contribution to journalArticle

Perovskite
Oxides
Doping (additives)
oxides
Seebeck coefficient
2006
13 Citations (Scopus)

Power factors of late rare earth-doped Ca3Co2O6 oxides

Nong, N. V. & Ohtaki, M., Aug 1 2006, In : Solid State Communications. 139, 5, p. 232-234 3 p.

Research output: Contribution to journalArticle

Oxides
Rare earths
Substitution reactions
rare earth elements
oxides
13 Citations (Scopus)

Synthesis and Rietveld analysis of Zn4 - XCdxSb 3 bulk crystals in the Zn-rich region

Souma, T. & Ohtaki, M., Mar 9 2006, In : Journal of Alloys and Compounds. 413, 1-2, p. 289-297 9 p.

Research output: Contribution to journalArticle

Rietveld analysis
Rietveld method
Crystals
Powders
Lattice constants
2005

Site-selective substitution by transition metal cations for NaCo 2O4 via ion-exchange

Nojiri, Y. & Ohtaki, M., Jan 1 2005, In : Journal of the Ceramic Society of Japan. 113, 1318, p. 400-404 5 p.

Research output: Contribution to journalArticle

Transition metals
Cations
Ion exchange
Substitution reactions
Positive ions

遷移金属カチオンを用いたイオン交換によるNaCo_2O_4のサイト選択元素置換

Translated title of the contribution: Site-Selective Substitution by Transition Metal Cations for NaCo_2O_4 via Ion-ExchangeNojiri, Y. & Ohtaki, M., Jun 1 2005, In : Journal of the Ceramic Society of Japan. 113, 1318, p. 400-404 5 p.

Research output: Contribution to journalArticle

Transition metals
Cations
Ion exchange
Substitution reactions
Ions
2001
64 Citations (Scopus)

Synthesis of TiO 2 /CdS nanocomposite via TiO 2 coating on CdS nanoparticles by compartmentalized hydrolysis of Ti alkoxide

Fujii, H., Inata, K., Ohtaki, M., Eguchi, K. & Arai, H., Jan 1 2001, In : Journal of Materials Science. 36, 2, p. 527-532 6 p., 319928.

Research output: Contribution to journalArticle

Hydrolysis
Nanocomposites
Nanoparticles
Coatings
Micelles
4 Citations (Scopus)

Threshold conditions for bulk second-order nonlinearity and near-surface second-order nonlinearity in thermally poled infrasil silica

Qiu, M., Mizunami, T., Shimomura, T. & Ohtaki, M., Jan 1 2001, In : Optical Review. 8, 3, p. 159-162 4 p.

Research output: Contribution to journalArticle

nonlinearity
silicon dioxide
thresholds
silica glass
ionic waves

液晶鋳型-水熱処理法による低次元量子閉じ込め構造酸化物半導体の合成と光物性

Translated title of the contribution: Synthesis and Optical Properties of Low-Dimensional Quantum-Confined Oxide Semiconductors by Liquid Crystal Templating-Hydrothermal Technique大瀧倫卓 & 三宅., Mar 30 2001, In : 九州大学大学院総合理工学報告. 22, 4, p. 359-364 6 p.

Research output: Contribution to journalArticle

2000

2段階焼結法で合成したNaCo_2O_4焼結体の微細構造と熱電特性

Translated title of the contribution: Microstructures and Thermoelectric Properties of NaCo_2O_4 Prepared by Double-step Sintering大瀧倫卓 & 前田英司, Nov 15 2000, In : Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 47, 11, p. 1159-1164 6 p.

Research output: Contribution to journalArticle

Oxides
Sintering
Microstructure
Seebeck coefficient
Crystallites
15 Citations (Scopus)

Intramolecularly selective decomposition of surfactant molecules on photocatalytic oxidative degradation over TiO2 photocatalyst

Ohtaki, M., Sato, H., Fujii, H. & Eguchi, K., Apr 20 2000, In : Journal of Molecular Catalysis A: Chemical. 155, 1-2, p. 121-129 9 p.

Research output: Contribution to journalArticle

Photocatalysts
Surface-Active Agents
Surface active agents
surfactants
degradation
24 Citations (Scopus)
Oxides
Sintering
Microstructure
Seebeck coefficient
Crystallites
1999
17 Citations (Scopus)

Thermoelectric properties and crystal chemistry of promising oxide candidate NaxCoO2

Ohtaki, M., 1999, In : Unknown Journal. p. 565-568 4 p.

Research output: Contribution to journalArticle

Crystal chemistry
crystal chemistry
oxide
Oxides
transition element
Hole concentration
Seebeck coefficient
Sulfides
Temperature
Electric Conductivity
9 Citations (Scopus)

Thermoelectric properties of chevrel-type sulfides AMo6S8 (A=Fe, Ni, Ag, Zn, Sn, Pb, Cu)

Tsubota, T., Ohtaki, M. & Eguchi, K., Jan 1 1999, In : Journal of the Ceramic Society of Japan. 107, 8, p. 697-701 5 p.

Research output: Contribution to journalArticle

Sulfides
sulfides
Hole concentration
Seebeck coefficient
room temperature