Effect of Microstructural Control on Thermoelectric Properties of Hot‐Pressed Aluminum‐Doped Zinc Oxide

Fujishiro, Yoshinobu; Miyata, Motoyuki; Awano, Masanobu; Maeda, Kunihiro

doi:10.1111/j.1151-2916.2003.tb03610.x

Cited by 29 publications

(18 citation statements)

References 5 publications

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“…The thermal conductivity of ZnO is basically high due to its light constituent elements and bonding nature, and it exceeds 100 W/m K for a single crystal 9 and 30 W/m K to 40 W/m K for polycrystalline bulk prepared by conventional sintering. 10,11 Hot-pressing of nanoparticles synthesized by coprecipitation results in a reduction in thermal conductivity to 20 W/m K, 12 because grain growth during hot-pressing results in a grain size of 1 lm, although the starting material was in the nanometer range. Grain sizes down to 100 nm result in thermal conductivity comparable to that of SiGe alloys.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric Properties of Nanograined ZnO

Kinemuchi

Mikami

Kobayashi

et al. 2009

Journal of Elec Materi

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Bulk ZnO with a grain size of 20 nm was successfully obtained by pulsed electric current sintering. The crystalline size was almost identical to that of the raw particles, because the sintering temperature was as low as 200°C. A pressure of 500 MPa effectively enhanced densification, leading to a relative density of >90% at 200°C. The small grain size led to a low thermal conductivity of 3 W/m K at room temperature, due to enhanced boundary scattering. The Seebeck coefficient was higher than that of micrograined ZnO with similar Ga doping (0.3 at.% Ga). However, the resistivity was increased by more than 1000 times. The temperature dependence of conductivity showed thermally activated conduction behavior, while that of micrograined ZnO exhibited metallic-like behavior. The thermoelectric properties suggest that a carrier trap in the nanograined ZnO hinders carrier transport. Surface modification of the ZnO nanoparticles by heat treatment in H 2 resulted in observable photoluminescence which was quenched in the starting nanoparticles, and led to a decrease in the resistivity of the sintered bulk, which indicates that control of surface defects on the nanoparticles is crucial for enhancement of the thermoelectric properties of nanograined ZnO.

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Section: Resultsmentioning

confidence: 99%

Thermoelectric Properties of Nanograined ZnO

Kinemuchi

Mikami

Kobayashi

et al. 2009

Journal of Elec Materi

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“…Despite the fact that nanoparticles containing alternative plasmonic materials do not reveal significantly better resonant properties, utilizing of alternative plasmonic materials in PPTT can be promising due to their high thermal conductivity [66,67] that allows one to apply lower radiation intensity for hyperthermia of malignant cells that does not affect normal cells.…”

Section: Resultsmentioning

confidence: 99%

New ideally absorbing Au plasmonic nanostructures for biomedical applications

Zakomirnyi

Rasskazov

Карпов

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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In this paper a new set of plasmonic nanostructures operating at the conditions of an ideal absorption [1] was proposed for novel biomedical applications. We consider spherical x/Au nanoshells and Au/x/Au nanomatryoshkas, where 'x' changes from conventional Si and SiO 2 to alternative plasmonic materials [2], such as zinc oxide doped with aluminum, gallium and indium tin oxide. The absorption peak of proposed nanostructures lies within 700-1100nm wavelength region and corresponds to the maximal optical transparency of hemoglobin and melanin as well as to the radiation frequency of available pulsed medical lasers. It was shown that the ideal absorption takes place in a given wavelength region for Au coatings with thickness less than 12nm. In this case finite quantum size effects for metallic nanoshells play significant role. The mathematical model for the search of the ideal absorption conditions was modified by taking into account the finite quantum size effects.

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“…Many metal oxides, such as Ca 3 Co 4 O 9 , ZnO, and SrTiO 3 , have since been screened for high performance. [7][8][9][10] In this study, silver antimonate (AgSbO 3 ), which was reported to have some advantages as a thermoelectric material, 11,12 was synthesized by a special process to further investigate its thermoelectric properties, with a focus on increasing its phase purity. AgSbO 3 crystallizes in a defective pyrochlore structure, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Thermoelectric Properties of AgSbO3 Ceramics Prepared by Ion-Exchange Powder Synthesis and Normal Sintering

2011

Journal of Elec Materi

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Silver antimonate (AgSbO 3 ) is a potential high-temperature thermoelectric oxide with a low thermal conductivity, but it is difficult to fabricate dense bulk material with high phase purity. Well-dispersed AgSbO 3 nanopowder with an average diameter of 50 nm was synthesized by an ion-exchange process in this study, the sintering density of which was apparently enhanced. Nearly single-phase AgSbO 3 ceramic samples with a relative density close to 90% were obtained when sintered at a relatively low temperature (1273 K). The electrical conductivity of AgSbO 3 increased greatly with increasing sintering temperature, probably because of defects originating from the compositional deviation caused by sintering, in addition to increased density. This study also confirmed that AgSbO 3 had a low thermal conductivity, from 1.1 W m À1 K À1 at room temperature to 0.8 W m À1 K À1 at 673 K.

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Effect of Microstructural Control on Thermoelectric Properties of Hot‐Pressed Aluminum‐Doped Zinc Oxide

Cited by 29 publications

References 5 publications

Thermoelectric Properties of Nanograined ZnO

Thermoelectric Properties of Nanograined ZnO

New ideally absorbing Au plasmonic nanostructures for biomedical applications

Microstructure and Thermoelectric Properties of AgSbO3 Ceramics Prepared by Ion-Exchange Powder Synthesis and Normal Sintering

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