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In situ Observation of Lithium Stripping and Plating Process in an Open-cell All-solid-state Lithium Metal Battery

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 1287-1288页

作者： Wu, C. Zhao, L. Ai, Q. Risal, S. Lou, J. Yao, Y. Fan, Zheng Materials Science and Engineering Program and Texas Center for Superconductivity at the University of Houston University of Houston Houston TX United States Department of Electrical and Computer Engineering University of Houston Houston TX United States Department of Materials Science and Nano Engineering Rice University Houston TX United States Department of Engineering Technology University of Houston Houston TX United States

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Direct Anodic Electrografting of Osmium Complexes on Indium Tin Oxide

SSRN

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SSRN 2024年

作者： Lee, Haeyeon Go, Su Yong Kim, Chae Yun Kim, Eun Joong Kang, Chung Mu Chung, Taek Dong Department of Chemistry Seoul National University Seoul08826 Korea Republic of Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon16229 Korea Republic of Advanced Institute of Convergence Technology Suwon16229 Korea Republic of

Indium tin oxide (ITO) is a widely used electrode material in electrochemical biosensors owing to its beneficial characteristics such as transparency and chemical inertness. The exceptionally sluggish kinetics of heterogeneous electron transfer in ITO provides an exceptionally low background current, making electron mediators essential for electrochemical sensors. However, the chemical modification of ITO with molecular mediators is still challenging. Few straightforward and credible methods are available to obtain sufficiently thin mediator films firmly anchored on the ITO without losing its inherent benefits, including low background current and transparency. This study demonstrated the anodic electrografting of three osmium complexes, which allowed the formation of molecular mediator monolayers on ITO. The densely packed monolayer of osmium complexes retained their reversible redox processes over hundreds of potential cycles. We confirmed electron mediation by the modified electrodes for aminophenol oxidation, suggesting a simple protocol for developing ITO-based biosensors functionalized with molecular mediators. © 2024, The Authors. All rights reserved.

关键词： Tin oxides

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Transferrable Alumina Membranes as High-Performance Dielectric for Flexible 2D Materials Devices

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Advanced Electronic Materials 2024年第6期10卷

作者： Borhade, Poonam Subhash Raman, Radha Yen, Zhi-Long Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Central University Taoyuan320317 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan

2D materials have shown great promise for novel electronic functionality. A common challenge for 2D materials-based transistors is forming a high-performance gate terminal due to the challenges of depositing a dielectric of sufficient quality and controllable thickness. Herein the van-der-Waals integration of a free-standing Al2O3 dielectric membrane is demonstrated as a facile, scalable, and powerful gate dielectric. A process is developed that permits the wet transfer of an amorphous alumina layer with a finely adjustable equivalent oxide thickness (EOT) in the single nanometer range. Electrical characterization demonstrates the high breakdown field and low leakage of the dielectric and integration into 2D materials transistors reveals a high performance. The wafer-scale uniformity of the dielectric membrane permits the formation of large-scale flexible devices that exhibit good robustness and long-term stability. © 2024 The Authors. Advanced Electronic Materials published by Wiley-VCH GmbH.

关键词： Dielectric materials

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Effect of chemical composition and microstructure on the thermal conductivity of Mg-Al-Ca alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 9-13页

作者： Kirimoto, Yuichi Kondo, Natsuki Ito, Mizuki Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama-shi Toyama Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

In recent years, the increasing demand for electric vehicles, digital devices such as PCs and smartphones, and renewable energy storage systems has created a need for higher-performance batteries. Accordingly, the thermal conductivity of the case that houses the battery is becoming increasingly important. In this study, compositions with high thermal conductivity and good castability were investigated, focusing on Mg-Al-Ca alloys, and the relationship between the two was examined through thermal conductivity measurements and microstructural observations. As a result, the Mg-6%Al-4%Ca alloy was optimal in terms of castability and thermal conductivity. It was confirmed that a lower Al solid solution capacity and a higher purity of the matrix phase are important to improve the thermal conductivity. It is also suggested that the second phase, platelet Al2Ca, is likely to be recognized and enriched in the matrix, contributing to the improvement of thermal conductivity. The amount of Ca solid solution in the matrix was suggested to be reduced by the enrichment of Al in the matrix. The Ca solid solution in the matrix was found to be less effective in reducing thermal conductivity than the Al solid solution. © 2024 The Japan Institute of Light Metals.

关键词： Magnesium alloys

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Z-Laminating Assembly of Graphene nanoflakes for Super-Strong Membranes and Functional Coatings

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ACS Applied nano Materials 2024年第13期7卷 14957-14963页

作者： Santos, Ian Daniell Tjarks, Patrick Muthu, Jeyavelan Lin, You-Chen Yen, Zhi-Long Chand, Pradyumna Kumar Raman, Radha Nguyen, Dinh Tuan Rouhani, Mehdi Jeng, Yeau-Ren Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei 106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 106 Taiwan J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Prague 18200 Czech Republic Institute of Atomic and Molecular Sciences Academia Sinica Taipei 106 Taiwan Department of Chemistry National Taiwan University Taipei 106 Taiwan Department of Physics National Central University Taoyuan 320 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Central University Taipei 106 Taiwan Department of Biomedical Engineering National Cheng Kung University 1 University Road Tainan 70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan 70101 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng-Kung University (NCKU) Tainan 70101 Taiwan

We demonstrate the strengthening of graphene, an atomically thin carbon allotrope, by out-of-plane folding. Through lateral confinement of graphene at the water-air interface, nanoscale buckling was induced in suspended flakes, leading to an unexpected folding transition beyond a critical surface pressure. The emergence of folding was confirmed by in situ Brewster angle reflectivity and ex situ microscopy, showing a unique “z-laminated” nanostructure. Molecular dynamics simulations indicate that z-lamination yields an enhanced adhesion between neighboring flakes compared to lateral sliding, which was confirmed by a surface pressure hysteresis during the folding process. Mechanical testing reveals superior Young’s modulus and yield strength when compared to conventional graphene assemblies and even compared to composites. We demonstrate the potential of the z-lamination approach for applications in graphene-based structural materials, tribological layers, and functional electrochemical coatings. Finally, the complete recyclability of z-laminated graphene opens up new routes toward sustainable nanostructured materials. © 2024 The Authors. Published by American Chemical Society

关键词： 2D materials composites laminated graphene membranes recyclable

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Investigation of manufacturing conditions of single roll rapidly solidified ribbon for anode materials of magnesium rechargeable batteries

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第11期73卷 537-544页

作者： Kirimoto, Yuichi Fuke, Kousuke Tsukeda, Tadayoshi Aida, Tetsuo Nemoto, Yasunori Ikeda, Minoru Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi-shiToyama Toyama930-8555 Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi-shiToyama Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama-shi-shiToyama Toyama Japan FLOW Science JAPAN Shizuoka Hamamatsu-shi Japan CHUETSU METAL WORKS CO. LTD Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Saitama Kawaguchi-shi Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

Magnesium rechargeable batteries are attracting attention as next-generation rechargeable batteries because of their resource abundance, cost, safety, and high electrical capacity per volume compared to conventional lithium-ion rechargeable batteries. Our joint research team focused not only on the electrochemically active magnesium composition of ribbon for the negative electrode materials of magnesium rechargeable batteries but also on the production process, focused on the single roll type liquid quenching and rapid solidification method, which can be produced at a lower cost. In this study, the optimal processing conditions were examined by comparing CAE analysis with ribbon actually manufactured, with the aim of further improving manufacturing conditions using the same method, such as length discontinuities, thickness, and surface properties of ribbon. We specifically various process parameters such as injection pressure and roll peripheral speed for evaluation. As a result, several linear cracks were observed on the surface of the ribbon as the peripheral speed increased and as the Gap became wider, and the surface properties tended to deteriorate. Also, It was found that the dominant factor in the length of the ribbon was the peripheral speed. As the peripheral speed increased, the length of the ribbon tended to increase. © 2023 Japan Institute of Light Metals. All rights reserved.

关键词： Surface properties

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Electron Cloaking in MoS2 for High-Performance Optoelectronics

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nano letters 2025年第23期25卷 2025 May 28页

作者： Yu-Xiang Chen Jian-Jhang Lee Ding-Rui Chen You-Chen Lin Hao-Ting Chin Xiu-Yu Huang Sheng-Kuei Chiu Chu-Chi Ting Mario Hofmann Ya-Ping Hsieh Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan. International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 10617 Taiwan. Department of Electronic Engineering Chung Yuan Christian University Taoyuan 320 Taiwan. Department of Physics National Taiwan University Taipei 10617 Taiwan. Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 10617 Taiwan. Department of Materials Science and Engineering Feng Chia University Taichung 407 Taiwan. Department of Materials Science National University of Tainan Tainan 70005 Taiwan. Graduate Institute of Opto-Mechatronics Department of Mechanical Engineering National Chung Cheng University Chia-Yi 62102 Taiwan.

Defects in two-dimensional (2D) materials represent both challenges and opportunities to their optoelectronic performance. While defects limit the carrier mobility in transistors through increased charge scattering, they also enhance 2D material functionality in sensors. Electron cloaking, a process that reduces Coulomb scattering via localized electron-defect interactions, has recently been shown to mitigate the performance degradation of bulk semiconductors in the presence of defects. We demonstrate the realization of electron cloaking in 2D materials through the metal decoration of defects. Sulfur vacancies were introduced in MoS and selectively decorated with aluminum using atomic layer deposition. Theoretical and experimental characterization demonstrate the suppression of electronic scattering through localized interactions. Optoelectronic measurements reveal a significant improvement in carrier mobility and lifetime, highlighting the effectiveness of the cloaking mechanism. Our findings open a route independently to maximize performance and functionality of optoelectronic devices, which is illustrated by the realization photosensors with unprecedented sensitivity and speed.

关键词： 2D material Coulomb scattering MoS2 defect-limited mobility electron cloaking electron−defect interaction vacancies

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Design and performance of an ultrahigh vacuum spectroscopic-imaging scanning tunneling microscope with a hybrid vibration isolation system

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Review of Scientific Instruments 2024年第3期95卷 033701页

作者： Chung, Pei-Fang Venkatesan, Balaji Su, Chih-Chuan Chang, Jen-Te Cheng, Hsu-Kai Liu, Che-An Yu, Henry Chang, Chia-Seng Guan, Syu-You Chuang, Tien-Ming Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica National Taiwan University Taipei11529 Taiwan

A spectroscopic imaging-scanning tunneling microscope (SI-STM) allows for the atomic scale visualization of the surface electronic and magnetic structure of novel quantum materials with a high energy resolution. To achieve the optimal performance, a low vibration facility is required. Here, we describe the design and performance of an ultrahigh vacuum STM system supported by a hybrid vibration isolation system that consists of a pneumatic passive and a piezoelectric active vibration isolation stage. We present the detailed vibrational noise analysis of the hybrid vibration isolation system, which shows that the vibration level can be suppressed below 10−8 m/sec/√Hz for most frequencies up to 100 Hz. Combined with a rigid STM design, vibrational noise can be successfully removed from the tunneling current. We demonstrate the performance of our STM system by taking high resolution spectroscopic maps and topographic images on several quantum materials. Our results establish a new strategy to achieve an effective vibration isolation system for high-resolution STM and other scanning probe microscopies to investigate the nanoscale quantum phenomena. © 2024 Author(s).

关键词： Vibration analysis

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Perspective on the perovskite quantum dots for flexible photovoltaics

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Journal of Energy Chemistry 2021年第11期30卷 505-507,I0011页

作者： Jiabei Yuan Nopporn Rujisamphan Wanli Ma Jianyu Yuan Youyong Li Shuit-Tong Lee Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123JiangsuChina Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina Nanoscience and Nanotechnology Graduate Program Faculty of ScienceKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand

Owing to the ever-increasing charging demand for portable electronics,display devices and wearable electronic textiles,flexible and lightweight solar cells are highly urgent to be ***-generation solution-processable photovoltaic(PV)devices attracted great attentions due to their unique properties of low-cost,lightweight,and large-area printing compatibility with flexible substrates[1].

关键词： printing perovskite compatibility

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Magnetism-induced second-order nonlinear optical responses in multiferroic BiFeO3

arXiv

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arXiv 2024年

作者： Prasad, Babu Baijnath Liu, Guan-Fu Guo, Guang-Yu Department of Physics Center for Theoretical Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan

Nonlinear optical (NLO) responses of noncentrosymmetric nonmagnets have drawn a lot of attention in the past decades because of their significance in materials characterization, green energy and device applications. On the other hand, magnetism not only can break the inversion symmetry in centrosymmetric crystals but also introduce novel NLO phenomena in noncentrosymmetric materials, thus enabling the magnetic field control of light-matter interactions. However, the magnetism-induced NLO responses have rarely been studied so far. In this paper, we first extend the numerical calculation friendly formula by Rashkeev et al. [Phys. Rev. B 57, 3905 (1998)] for second harmonic generation (SHG) in nonmagnetic materials to include magnetic systems and then calculate the magnetism-induced NLO responses of bismuth ferrite (BiFeO3), a multiferroic that exhibits both ferroelectricity and antiferromagnetic (AFM) ordering at room temperature and has a band gap that falls in the visible frequency region. First, we find that the calculated magnetism-induced SHG susceptibilities are large and the SHG intensity is tunable with the reversal of magnetization. In particular, the interference between crystallographic SHG and magnetically induced SHG components results in a strong magnetic contrast of the SHG signal of ∼440% at SHG photon energy of 4.82 eV, thus enabling a magnetic control of the SHG in multiferroic BiFeO3. Also, because of the sensitivity of the SHG signal to the direction of the Néel vector, the SHG can be utilized to detect the reversal of the Néel vector in the AFM materials, which is an important issue for AFM spintronics. Second, the calculated bulk photovoltaic effects (BPVE) in BiFeO3 are also strong, being larger than some well-known NLO compounds such as BaTiO3, GaAs, CdS and CdSe. Finally, we analyse the origins of the prominent features in the NLO response spectra in terms of the calculated quantum geometric quantities. Our interesting findings suggest that th

关键词： Gallium arsenide

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