Artoni Kevin R. Ang

Geometric Decoupling of Thickness and Thermal Gradient in Wearable Thermoelectric Generators via a Stair-Shaped Architecture

Suresh Prasanna C, Musaddiq Al Ali, Artoni Kevin R. Ang, Masaharu Matsunami et autres

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Hybrid Optimization of Nonconvex Multiphysics Topologies for Additively Manufactured Porous Fuel Grains

Musaddiq Al Ali, Artoni Kevin R. Ang, Suresh Prasanna C, Masatoshi SHIMODA et autres

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Understanding the Anomalous Thermoelectric Behavior of Fe–V–W–Al-Based Thin Films

Kavita Yadav, Yuya Tanaka, Artoni Kevin R. Ang, K. Hirose et autres

We investigated the thermoelectric and thermal behavior of Fe–V–W–Al-based thin films prepared using the radio frequency magnetron sputtering technique at different oxygen pressures (0.1–1.0 × 10 –2 Pa) and on different substrates (n, p, and undoped Si). Interestingly, at lower oxygen pressure, …

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Intermediate multidomain state in single-crystalline Mn-doped BiFeO3 thin films during ferroelectric polarization switching

Seiji Nakashima, Koji Kimura, Naohisa Happo, Artoni Kevin R. Ang et autres

Abstract A intermediate multidomain state and large crystallographic tilting of 1.78° for the (hh0)pc planes of a (001)pc-oriented single-domain Mn-doped BiFeO3 (BFMO) thin film were found when an electric field was applied along the [110]pc direction. The anomalous crystallographic tilting was caused …

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Improvement of thermoelectric performance of flexible compound Ag2S0.55Se0.45 by means of partial V-substitution for Ag

Kosuke Sato, Saurabh Singh, Itsuki Yamazaki, Keisuke Hirata et autres

The effects of the partial V-substitution for Ag on the thermoelectric (TE) properties are investigated for a flexible semiconducting compound Ag2S0.55Se0.45. Density functional theory calculations predict that such a partial V-substitution constructively modifies the electronic structure near the bottom of the conduction …

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Development of Cu2Se/Ag2(S,Se)-Based Monolithic Thermoelectric Generators for Low-Grade Waste Heat Energy Harvesting

Artoni Kevin R. Ang, Itsuki Yamazaki, Keisuke Hirata, Saurabh Singh et autres

With the ongoing climate and energy crises, thermoelectric conversion has slowly emerged as a clean and reliable alternative energy source for small Internet of Things (IoT) devices. Commercially available thermoelectric generators (TEGs) are typically composed of expensive and toxic Bi 2 Te …

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Thermoelectric performance of Fe2V0.9W0.1Al thin films deposited on n-type Si substrates

Fahmi Machda, Saurabh Singh, Kentaro Kuga, Artoni Kevin R. Ang et autres

Abstract Fe2V0.9W0.1Al thin films are prepared on n-type Si substrates by means of rf magnetron sputtering with varied substrate temperatures from 743–1043 K, then subsequently annealed for one hour in a vacuum at 1043 K. The thin films deposited at 1043 K …

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Direct Observation of Group-V Dopant Substitutional Defects in CdTe Single Crystals

Akira Nagaoka, Koji Kimura, Artoni Kevin R. Ang, Yasuhiro Takabayashi et autres

Point defect chemistry strongly affects the fundamental properties of materials and has a decisive impact on device performance. The Group-V dopant is prominent acceptor species with high hole concentration in CdTe; however, its local atomic structure is still not clear owing to …

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Development of serial X-ray fluorescence holography for radiation-sensitive protein crystals

Artoni Kevin R. Ang, Yasufumi Umena, Ayana Tomita, Naoya Shibayama et autres

X-ray fluorescence holography (XFH) is a powerful atomic resolution technique capable of directly imaging the local atomic structure around atoms of a target element within a material. Although it is theoretically possible to use XFH to study the local structures of metal …

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X-ray fluorescence holography of biological metal sites: Application to myoglobin

Ayana Tomita, Artoni Kevin R. Ang, Koji Kimura, Riho Marumi et autres

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Atomic positions and displacements in piezoelectric materials Ca3TaGa3Si2O14 and Ca3TaGa1.5Al1.5Si2O14 investigated by Ta-Lα X-ray fluorescence holography

Mamoru Kitaura, Artoni Kevin R. Ang, Yuta Yamamoto, Naohisa Happo et autres

The atomic positions and displacements of atoms around the Ta atom in piezoelectric materials Ca3TaGa3Si2O7 (CTGS) and Ca3TaGa1.5Al1.5Si2O7 (CTGAS) were investigated at 100 K by Ta-Lα X-ray fluorescence holography (XFH). The experimental atomic images were compared with the simulated ones using the …

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Enhanced Performance of Monolithic Chalcogenide Thermoelectric Modules for Energy Harvesting via Co-optimization of Experiment and Simulation

Huajun Lai, Saurabh Singh, Ying Peng, Keisuke Hirata et autres

With the development of application of wireless sensor nodes (WSNs), the need for energy harvesting is rapidly increasing. In this study, we designed and fabricated a robust monolithic thermoelectric generator (TEG) using a simple, low-energy, and low-cost device fabrication process. Our monolithic …

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