15 Result(s)
within
Takashi Itoh
English
Applied and Technical Physics
Materials Science, general
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Article
Optical Properties of Random Multilayers of Amorphous A-Si:H/A-Si3N4+x:H and the Classical Localization
In the optical reflectance spectrum of the random multilayers of a-Si:H/a-Si3N4+x:H, it is observed an anomalous peak which is explained by the classical localization of light propagation. The following two subje...
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Article
Increase of Hydrogen-Radical Density and Improvement of The Crystalline Volume Fraction of Microcrystalline Silicon Films Prepared by Hot-Wire Assisted PECVD Method
Higher crystalline Si volume fractions in hydrogenated microcrystalline silicon ( µc-Si:H) films have been achieved by the hot-wire assisted plasma enhanced chemical vapor deposition (HWA-PECVD) method compare...
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Article
Effect of Hydrogen Radical on Properties of Hydrogen in Hydrogenated Microcrystalline Silicon
Hydrogenated microcrystalline silicon (μc-Si:H) films are prepared by hot-wire assisted plasma enhanced chemical vapor deposition, which controls the hydrogen radical density by filament temperatures, Tf, with...
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Article
Thermoelectric properties of polycrystalline Si1-xGex grown by die-casting vertical Bridgman growth technique
The die-casting growth process combined with an advanced version of the Bridgman method was employed for manufacturing the multicrystalline bulk crystal of Si1−xGex. This process provides a form of phase transfor...
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Article
Effect of fullerene addition on thermoelectric properties of n-type skutterudite compound
Thermoelectric power generation is a promising method for harnessing waste thermal energy, especially in the temperature range between 500 and 800 K. It is necessary to improve the performance of thermoelectri...
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Article
Effect of Combined Addition of Silicon Carbide Whiskers and Fullerene Nanoparticles on Properties of Thermoelectric Zinc Antimonide
Thermoelectric power generation is a hopeful method harnessing waste thermal energy particularly covering a middle temperature range between 500 and 800K. A Zn4Sb3 compound is a promising “phonon glass electron c...
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Article
Design and evaluation of n-type Si1-xGex as a thermoelectric-conversion material
Si1-xGex alloys show the high power generating efficiency as a thermoelectric- conversion material. We evaluate the thermoelectric power of the n-type SiGe system on the basis of the first principles calculations...
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Article
Syntheses of Ni-doped and Fe-doped CoSb3 Thermoelectric Nanoparticles through Modified Polyol Process
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 hi...
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Article
Thermoelectric Properties of Carbon Nanotubes Added n-type CoSb3 Compound
Cobalt triantimonide compounds are well known as materials with good thermoelectric properties over temperature range of 550-900 K. For further improving thermoelectric performance, reduction of thermal conduc...
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Article
Effects of GaN Thin Layer on InGaN at Electrolyte-Semiconductor Interface for the Application of Photoelectrochemical Water Splitting
Photoelectrochemical properties of nitride semiconductors are paid attention due to their possibilities of water splitting by visible light absorption. However, the photocurrent density of InxGa1-xN, which absorb...
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Article
Influence of Addition of Alumina Nanoparticles on Thermoelectric Properties of Higher Manganese Silicide
Higher manganese silicide (HMS) is a low-cost and eco-friendly thermoelectric material available for recovering waste heat of 500 to 900 K. In this research, we tried to uniformly disperse the alumina nanopart...
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Article
Synthesis of CaMn2O4-related electrocatalyst for oxygen evolution electrode of water-splitting
Water-splitting by using electric power produced by solar cells is promising system to produce hydrogen without fossil fuels. Oxygen evolving catalyst is, however, major problem to prevent using this system wi...
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Article
Influence of Aluminum Addition on Thermoelectric Performance of Mg2Si Compound under Air Exposure with Temperature Difference
Dimagnesium silicide (Mg2Si) is an eco-friendly material useful for thermoelectric generation using waste heat of temperature range of 600 to 900 K. To improve the thermoelectric performance of the Mg2Si compound...
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Article
Thermoelectric Properties of Al-doped Mg2Si Compounds Prepared via Three Kinds of Process for Grain Refinement
Dimagnesium silicide is an eco-friendly thermoelectric compound whose constituent elements of both Mg and Si are non-toxic and exist in abundance on the earth. In this study, we attempted to control the therma...
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Article
Optimization of Degreasing-Sintering Process for Mg2Si/PLA Mixture and Influences of Additive Amount of Al on Sintered Density and Thermoelectric Performance of Mg2Si Fabricated by the Optimized Process
Fused deposition modelling (FDM) type of 3D printing is widely used for manufacturing complex shaped polymer products. Recently, the metal/polymer composite products can be made by 3D printer using metal/polym...
