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Polarization-dependent optical engineering of ferroelectric domains

ChemPhysMater 2023年第4期2卷 346-350页

作者： Shan Liu Yan Sheng Wieslaw Krolikowski Department of Quantum Science and Technology Research School of PhysicsAustralian National UniversityCanberra 2601Australia Department of Electronic Materials Engineering Research School of PhysicsAustralian National UniversityCanberra 2601Australia Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Science Program Texas A&M University at QatarDoha 23874Qatar

Ferroelectric domain engineering with infrared femtosecond laser pulses has been a powerful technique to achieve a spatially modulated second-order nonlinear coefficient in three ***,studies regarding the in-fluence of laser writing conditions on the light-induced ferroelectric domain inversion remain ***,an experimental study to reveal the role of laser polarization in light-induced domain inversions is *** dependence of the optical threshold and maximal writing depth of inverted domains on light polarization is ex-perimentally *** results are explained by considering the second-order nonlinear optical properties and birefringence-induced focus splitting in the *** findings are useful in fabricating high-quality and large-scale ferroelectric domain structures for applications in optics,electronics,and quantum technologies.

关键词： Nonlinear photonic crystals Ferroelectric domain engineering Quasi-phase matching Harmonic generation

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Control of sphalerite-chalcopyrite phase transition in CdSnAs2 for n-type thermoelectrics with high power factor

arXiv

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arXiv 2024年

作者： Kishida, Shoki Okamoto, Norihiko L. Katsube, Ryoji Nagaoka, Akira Nose, Yoshitaro Department of Materials Science and Engineering Kyoto University Kyoto606-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Materials Process Engineering Nagoya University Nagoya464-8603 Japan Electrical and Electronic Engineering Program University of Miyazaki Miyazaki889-2192 Japan

Practical applications of thermoelectric (TE) materials are constrained by less developments of high-performance n-type materials compared to their p-type counterparts. Chalcopyrite CdSnAs2 is a promising n-type semiconductor for thermoelectrics from its narrow bandgap around 0.2 eV and exceptionally high electron mobility of 103−104 cm2 V−1s−1. In this study, we investigated the crystal growth, microstructure, and thermoelectric properties of CdSnAs2. Contrary to conventional theory of unidirectional melt growth, CdSnAs2 samples at higher cooling rates exhibited better crystallinity, while some cracks were observed in samples cooled more slowly. Thermal analyses clarified that a phase transition from sphalerite to chalcopyrite occurred after solidification in the case of slow cooling, leading to dislocations and cracks due to the lattice mismatch between phases. The analysis at rapid cooling suggested that supercooling lowers the solidification temperature and produces an appropriate microstructure. Consequently, the sample grown at the highest cooling rate (7.6 ∘C min−1) achieved an ultrahigh power factor of 3180 μW m−1K−2 at 600 K and a peak zT of 0.62 at 682 K. In the power factor, CdSnAs2 surpasses conventional binary n-type TE materials such as SnSe and PbTe, proving that CdSnAs2 is a high potential candidate for mid-temperature TE applications. © 2024, CC BY-NC-ND.

关键词： Lattice mismatch

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Phase coherence and electron-electron interactions in epitaxial strained SrTiO3 films on Si(001)

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Physical Review B 2025年第15期111卷 155307-155307页

作者： Ryan J. Cottier Barry D. Koehne John T. Miracle Daniel A. Currie Craig H. Swartz Nikoleta Theodoropoulou Department of Physics Texas State University San Marcos Texas 78666 USA Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas 78666 USA

Oxide heterostructures based on SrTiO3 have emerged as a rich platform for exploring physical phenomena, most notably conductivity at interfaces between insulators. In this study, we investigate the electronic properties of an oxide-semiconductor heterostructure—SrTiO3 films grown epitaxially on Si(001). The lattice mismatch induces epitaxial strain, breaking the cubic symmetry of SrTiO3 and resulting in tetragonal distortion. Magnetotransport measurements reveal that the temperature and magnetic field dependence of the conductivity are dominated by two-dimensional quantum effects, weak localization, and electron-electron interactions. The low-temperature electronic properties indicate quantum confinement, strong electron correlations, exchange interactions, and Zeeman spin splitting. These findings underscore the potential of the SrTiO3/Si heterostructure for designing oxide-based quantum devices.

关键词： Lattice mismatch

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Correlation between the Morphology of Carbon Nanofibers and the Transport Characteristics of Li-Ions in a Lib Anode Under Fast Charging Conditions

SSRN

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SSRN 2023年

作者： Cho, Hang In Lee, Sung Hoon Park, Chong Rae WCU Hybrid Materials Program Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul08826 Korea Republic of

Energy storage materials for electric vehicles and energy storage systems must be able to supply high capacity quickly, which requires efficient Li-ion transport within the anode active material. The transport of Li ions through a battery system can lead to concentration polarization and subsequent overpotential, which can limit the electrochemical performance, especially under fast charging conditions. To overcome these limitations, it is important to control solvated Li-ion transport and design an anode material with a rational approach. One way to achieve this is by controlling the morphology of carbon nanofibers (CNFs) to create ion transport channels. A facile method for this was investigated using an immiscible polymer blend electrospinning system and interpreting a ternary phase diagram. The effects of the morphology and space characteristics of each CNF on the electrochemical performance were studied, particularly the rate capability and cycle stability under fast charging conditions. These characteristics were analyzed in terms of the transport properties of the electrochemical species in different types of ion channels. © 2023, The Authors. All rights reserved.

关键词： Electrospinning

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Enhancing PV solar panel efficiency through integration with a passive Multi-layered PCMs cooling system: A numerical study

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International Journal of Thermofluids 2024年 23卷

作者： Sheikh, Yahya Jasim, Muhammad Qasim, Muhammad Qaisieh, Alaa Hamdan, Mohammad O. Abed, Farid Materials Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Chemical and Biological Engineering American University of Sharjah Sharjah United Arab Emirates Civil Engineering Department American University of Sharjah Sharjah United Arab Emirates

Photovoltaic (PV) solar cells are at the forefront of sustainable electricity generation technologies, yet they exhibit relatively low efficiency. Typically, less than 20 % of the solar energy absorbed is converted into electrical energy, with the remainder converts into heat. This heat increases the PV panel's operating temperature, negatively impacting its efficiency and life expectancy. To mitigate this, a novel approach using multi-layered phase change materials (PCMs) has been examined in this study. The approach involves integrating organic PCMs (OPCMs) with metallic PCMs (MPCMs), enhancing PV panel cooling efficiency by attaching the multi-layer PCM to the panel's rear. This study, employing ANSYS FLUENT software's solidification and melting model, explores the impact of multi PCM layers thickness and total multi layers thickness on PV cell temperature and electrical efficiency. The analysis reveals that a multi-layered PCMs configuration with a thickness ratio of 15:85 between MPCM (CERROLOW-117® alloy) and OPCM (RT44) significantly decreases temperature rise in PV cells, resulting in a temperature drop of 59.6 °C. This improvement boosts PV panel performance by an average of 35.8 % compared to panels lacking cooling systems during peak sun hours under hot climate conditions characterized by ambient temperatures of 40 °C and high solar radiation exceeding 1000 W/m². This suggests that a carefully optimized PCM layering approach could markedly improve PV system efficiency, offering a practical solution to the overheating problem and extending the operational life of PV installations. © 2024 The Author(s)

关键词： Phase change materials

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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materials science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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On-Chip Perovskite Nanocrystal Laser Integrated with Long-Range Surface Plasmon Polariton Waveguide by Etching-Free Lithographic Patterning

On-Chip Perovskite Nanocrystal Laser Integrated with Long-Ra...

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2022 JSAP-Optica Joint Symposia, JSAP 2022

作者： Lee, Yang-Chun Lin, Hsin-Chang Lin, Cheng-Chieh Ho, Ya-Lun Xing, Di Chen, Mu-Hsin Lin, Bo-Wei Chen, Li-Yin Chen, Chun-Wei Delaunay, Jean-Jacques School of Engineering The University of Tokyo Japan Department of Photonics National Sun Yat-sen University Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Academia Sinica Taiwan Department of Materials Science and Engineering National Taiwan University Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Department of Photonics National Yang Ming Chiao Tung University Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taiwan

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Measuring 3D Chemistry at 1 nm Resolution with Fused Multi-Modal Electron Tomography

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1394-1395页

作者： Schwartz, Jonathan Di, Zichao Wendy Jiang, Yi Cho, Min Gee Qian, Yiwen Gu, Junsi Rozeveld, Steve Ercius, Peter Fessler, Jeffrey A. Xu, Ting Scott, Mary Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Mathematics and Computer Science Division Argonne National Laboratory Lemont IL United States Advanced Photon Source Argonne National Laboratory Lemont IL United States Department of Materials Science and Engineering University of California at Berkeley Berkeley CA United States National Center for Electron Microscopy Lawrence Berkeley National Laboratory Berkeley CA United States Dow Chemical Co. Midland MI United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI United States Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA United States Applied Physics Program University of Michigan Ann Arbor MI United States

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Correlation between Composition and Work Function Through Kelvin Probe Force Microscopy – Pure Magnesium Single Crystals

SSRN

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SSRN 2023年

作者： Türe, Yiğit Kaya, Ali Arslan Shin, Kwang Seon Turan, Servet Eskisehir Technical University Porsuk Vocational School Electronics and Automation Department Program of Mechatronics Eskisehir Turkey Mugla Sıtkı Kocman University Engineering Faculty Metallurgy and Materials Engineering Department Mugla Turkey Seoul National University Materials Science and Engineering Department Seoul Korea Republic of Eskisehir Technical University Engineering Faculty Materials Science and Engineering Department Eskisehir Turkey

The aim of this work was to investigate the feasibility of observing the effect of impurities in pure magnesium (Mg) on the work function (WF) measurements by using Kelvin Probe Force Microscopy (KPFM). In essence, the pure Mg samples used in this study can be regarded as extremely dilute solid solutions of Mg with some impurity atoms. This investigation further considers the measured WF differences within a crystal as figures that are directly affected by the free electron density distribution, which essentially refers to the nature of the interatomic bonding. A corollary of this view is that stacking fault energy (SFE) changes in a solid solution system can also be revealed via KPFM measurements, as SFE also depends on the free electron density distribution. Since the atomic density would affect the WF and SFE levels, the crystal orientations of the single crystal Mg samples had to be determined via electron diffraction patterns obtained via TEM. It has been shown that WF differences as measured via KPFM, offer a technique that can be at least qualitatively correlated with the interatomic bond strength levels, and therefore be also interpreted as an indicator of SFE levels. This practical measurement approach appears to be a reliable way of understanding the effect of individual elemental changes in multi-element solid-solution systems which currently do not lend themselves to computational techniques due to the number of elements involved. It should be borne in mind that the computed SFE values in the literature are not treated as absolute values but rather become useful when assessing the properties of alloys at a fundamental level, i.e., free electron density distributions. Therefore, it seems possible to use the principles of ‘electronic metallurgy’ in developing multi-element alloy systems. © 2023, The Authors. All rights reserved.

关键词： Single crystals

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A mini review on two-dimensional nanomaterial assembly

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Nano Research 2020年第5期13卷 1179-1190页

作者： Zhiwei Fang Qiyu Xing Desiree Fernandez Xiao Zhang Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at AustinAustinTexas 78712USA 2 School of Chemistry and Materials ScienceUniversity of Science&Technology of ChinaHefei 230026China

Two-dimensional(2D)nanomaterials have attracted a great deal of attention since the discovery of graphene in 2004,due to their intriguing physicochemical properties and wide-ranging applications in catalysis,energy-related devices,electronics and *** maximize the potential of 2D nanomaterials for their technological applications,controlled assembly of 2D nanobulding blocks into integrated systems is critically *** mini review summarizes the reported strategies of 2D materials-based assembly into integrated functional nanostructures,from in-situ assembly method to post-synthesis *** applications of 2D assembled integrated structures are also covered,especially in the areas of energy,electronics and sensing,and we conclude with discussion on the remaining challenges and potential directions in this emerging field.

关键词： two-dimensional materials assembly self-assembly post-synthesis assembly integrated nanostructures

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