Article
Chemistry, Multidisciplinary
Dario Ferreira Sanchez, Johannes Ihli, Damin Zhang, Thomas Rohrbach, Patric Zimmermann, Jinhee Lee, Camelia N. Borca, Natascha Bohlen, Daniel Grolimund, Jeroen A. van Bokhoven, Marco Ranocchiari
Summary: The introduction of structural defects in metal-organic frameworks (MOFs) through the fractional use of defective linkers can refine the properties of existing MOFs. Understanding the structure of defect-engineered MOFs is crucial for targeted property enhancement. Full-field X-ray absorption near-edge structure computed tomography can help visualize the chemical heterogeneity in defect-engineered MOF crystals, revealing non-uniform incorporation of defective linkers within the MOF.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Multidisciplinary
Xue-Peng Zhang, Anirban Chandra, Yong-Min Lee, Rui Cao, Kallol Ray, Wonwoo Nam
Summary: This article summarizes the information obtained so far in enzymatic and biomimetic systems that fuels the debate regarding the nature of the active oxidants and the mechanistic uncertainties associated with the transition metal-mediated O-O bond formation and cleavage reactions.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Physical
Linda Klag, Abhijeet Gaur, Matthias Stehle, Sebastian Weber, Thomas L. Sheppard, Jan-Dierk Grunwaldt
Summary: This study systematically investigated the activity and selectivity of Bi-Mo-Co-Fe oxide catalysts in selective oxidation of isobutene. The results showed that the activity and selectivity of the catalysts depend on the variety and interaction of metal oxide phases, and the reducibility of Fe3+ is crucial for catalytic activity.
Article
Nanoscience & Nanotechnology
Yutong Liu, Rodney D. L. Smith
Summary: The highly variable behavior and performance of hematite as photoanodes for the oxygen evolution reaction highlight the importance of understanding the interplay between defects and photoelectrochemical performance. By analyzing the structure-property relationship of hematite samples synthesized under different environments, it was found that different defects, namely oxygen vacancies and iron vacancies, affect the photoelectrochemical performance. These defects cause structural distortions that can be observed using Raman spectroscopy.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Weifeng Huang, Jianxin Kang, Tingwen Chen, Dawei Pang, Lihua Wang, Hang Wei, Changchun Yang, Dongfeng Zhang, Lin Guo
Summary: Nickel based magnetic nanocrystals have wide applications in magnetic and catalytic fields. Tunable magnetic properties of nickel can be achieved through non-magnetic doping or phase transformation. This study presents a way to control the magnetism of Au@Ni-carbide magnetic materials by adjusting the amount of carbon in the Ni layer, and provides solid evidence for the carbonation process from fcc-Ni to Ni X C instead of phase transformation to hcp-Ni. Further investigation reveals that the magnetism of the hybrids is mainly contributed from the residual fcc-Ni.
Review
Chemistry, Physical
Francisco Zaera
Summary: Catalysis in industrial chemical processes has long been studied through various spectroscopic techniques like vibrational and X-ray spectroscopies, allowing for a molecular-level understanding of catalytic mechanisms. These techniques help researchers explore the intricate details of catalytic processes and advancements in the field.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Yogesh Kumar, S. Tripathi, Mangla Nand, R. Jangir, V. Srihari, A. Das, R. Singh, U. Deshpande, S. N. Jha, A. Arya
Summary: This study investigated the effect of Nd doping on the structural, optical, and electronic properties of lanthanum monazite structure. Pure and Nd-doped LaPO4 powders were prepared and analyzed for their composition, oxidation states, crystal structure, and bandgaps. The results confirmed the successful substitution of Nd in the LaPO4 matrix and provided insights into the local structure using extended X-ray absorption fine structure analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Physical
George E. Cutsail, Serena DeBeer
Summary: X-ray spectroscopy plays a significant role in catalysis research by providing essential electronic and geometric structural information. The development of dedicated synchrotron-based X-ray emission spectrometers has expanded experimental capabilities, offering more detailed data. There is a continuous demand for conventional XAS applications and the integration with more advanced techniques.
Article
Chemistry, Physical
Mauricio Lopez Luna, Janis Timoshenko, David Kordus, Clara Rettenmaier, See Wee Chee, Adam S. Hoffman, Simon R. Bare, Shamil Shaikhutdinov, Beatriz Roldan Cuenya
Summary: The study investigates the structural and chemical evolution of oxide-supported iron nanoparticles during the activation stages and the CO2 hydrogenation reaction, revealing the preferential formation of iron surface oxides under reaction conditions. The results highlight the important role played by the oxide support in the final structure and composition of nanosized catalysts.
Article
Physics, Multidisciplinary
N. Jourdain, L. Lecherbourg, V Recoules, P. Renaudin, F. Dorchies
Summary: The ultrafast dynamics of the loss of crystalline periodicity in femtosecond laser heated warm dense copper was studied using x-ray absorption near-edge structures above the L3 edge. A characteristic time of approximately 1 ps was observed for energy densities ranging from 1 to 5 MJ/kg, with the experimental data well reproduced by two-temperature hydrodynamic simulations, indicating a thermal phase transition.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Deok-Yong Cho, Ki-jeong Kim, Kug-Seung Lee, Michael Lubben, Shaochuan Chen, Ilia Valov
Summary: Thin layers inserted between a metal electrode and a solid electrolyte can modify the transport of mass and charge at interfaces and affect electrode reactions. Incorporating C films in functional materials can alter the host's chemical properties and device functionalities. Using X-ray spectroscopies, it was found that inserting graphene or ultrathin amorphous C layers in a Ta2O5/Ta system can tune its chemical and electronic structures, thereby fundamentally changing the resistive switching functionalities.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Cafer Tufan Cakir, Tobias Piotrowiak, Uwe Reinholz, Alfred Ludwig, Franziska Emmerling, Christina Streli, Ana Guilherme Buzanich, Martin Radtke
Summary: In this study, the use of nondestructive, depth-resolved, element-specific characterization using grazing exit X-ray absorption near-edge structure spectroscopy (GE-XANES) is proposed to investigate the corrosion process in compositionally complex alloys (CCAs). The setup allows for scanning-free, nondestructive, depth-resolved analysis in a sub-micrometer depth range for layered materials. The findings demonstrate the potential of this approach for studying surface catalysis and corrosion processes in real-world materials.
ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Ian Byrnes, Lisa Magdalena Rossbach, Jakub Jaroszewicz, Daniel Grolimund, Dario Ferreira Sanchez, Miguel A. Gomez-Gonzalez, Gert Nuyts, Estela Reinoso-Maset, Koen Janssens, Brit Salbu, Dag Anders Brede, Ole Christian Lind
Summary: Micro- and nanoscopic X-ray techniques were used to investigate the relationship between uranium tissue distributions and adverse effects on the digestive tract of Daphnia magna. The study showed that exposure to uranium nanoparticles (UNPs) resulted in adverse morphological changes to the midgut and hepatic ceca, as well as abnormal intestinal epithelial cells. High-resolution nano-XRF identified U particulates throughout the midgut and within hepatic ceca cells, coinciding with tissue damages. These findings highlight the importance of disrupted intestinal function as a mode of acute U toxicity in D. magna.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yu Guo, Johannes Messinger, Lars Kloo, Licheng Sun
Summary: Photosynthetic water oxidation, catalyzed by a manganese-calcium oxide cluster, undergoes five different states during the reaction cycle. The unique geometry of the cluster allows for structural flexibility and interconversion between different forms at different states. This study reveals that a reversible isomerism, suppressed in one state, is fully recovered in the following state due to the release of a proton from a water ligand bound to the manganese. The altered coordination strength of the manganese-ligand facilitates a shift in the cluster's structure, affecting the water oxidation mechanism.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Biochemistry & Molecular Biology
Valentina Bonanni, Alessandra Gianoncelli
Summary: Scanning transmission X-ray microscopy (STXM) allows imaging of biological specimens and collection of localized spectroscopic information through X-ray fluorescence (XRF) and/or X-ray Absorption Near Edge Spectroscopy (XANES). Recent publications in synchrotrons have utilized soft X-ray spectro-microscopy in life science and environmental research to explore complex metabolic mechanisms by tracing chemical elements involved in metabolic pathways.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Roda Nur, Takashi Tsuchiya, Kasidit Toprasertpong, Kazuya Terabe, Shinichi Takagi, Mitsuru Takenaka
Summary: This study presents a monolayer MoS2 floating gate negative capacitance phototransistor that achieves high detectivity and low dark current by enhancing the photogating effect. Furthermore, the device shows potential in optical memory and optical synapse applications.
Article
Chemistry, Physical
Jennet R. Rabo, Makoto Takayanagi, Takashi Tsuchiya, Hideki Nakajima, Kazuya Terabe, Rinlee Butch M. Cervera
Summary: In this study, ScYSZ thin films were prepared on a SiO2-Si substrate using the pulsed laser deposition method, and the effects of different oxygen partial pressures and substrate temperatures on the film properties were investigated. The results showed that cubic polycrystalline films were obtained at higher oxygen partial pressures and substrate temperatures, while amorphous films were formed at lower oxygen partial pressures and substrate temperatures.
Review
Nanoscience & Nanotechnology
Kazuya Terabe, Takashi Tsuchiya, Tohru Tsuruoka
Summary: Developing nanoionics devices based on ion transport and electrochemical reactions may overcome functional and performance limitations of conventional electronics devices, possibly advancing the development of information and communication technologies.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
Yosuke Isoda, Daisuke Kan, Yumie Ogura, Takuya Majima, Takashi Tsuchiya, Yuichi Shimakawa
Summary: In this study, we used a proton-conducting solid electrolyte, Nafion, as the gate insulator to electrochemically control the structure and transport properties of SrFeOy films. Positive and negative gate voltages cause electrochemical reduction and oxidation of the films, respectively, leading to changes in the channel resistance. Additionally, we found that the electrochemically reduced SFO films can accommodate protons.
APPLIED PHYSICS LETTERS
(2022)
Review
Physics, Applied
Kazuya Terabe, Takashi Tsuchiya, Tohru Tsuruoka
Summary: Solid state ionics is a field that focuses on understanding and applying ion transport in solids, as opposed to electronics which focuses on electron transport. In recent years, unique functional solid state ionics devices have been developed for information and communication equipment. These devices, made of solid electrolytes and mixed conductors, are expected to be crucial for the future development of information and communication equipment.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
T. Wada, W. Namiki, T. Tsuchiya, D. Kan, Y. Shimakawa, T. Higuchi, K. Terabe
Summary: In this study, we report a method to manipulate perpendicular magnetic anisotropy (PMA) using an all-solid-state redox device. By utilizing a proton-conducting solid electrolyte, the PMA of a NiCo2O4 thin film was successfully manipulated at low voltage. This method enables various reservoir states and contributes to lower power consumption and high-precision machine learning.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Shogo Miyoshi, Yoshihiko Nishihara, Kazunori Takada
Summary: This study investigates the influence of cobalt introduction on the sintering behavior and phase equilibrium of LATP. It is found that a slight cobalt doping can improve the sinterability of LATP and form a stable second phase LiPO3. Under specific cobalt content conditions, the relative density of sintered LATP can reach 100%.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Ibrahima Gueye, Yasuhiro Shirai, Takahiro Nagata, Takashi Tsuchiya, Dhruba B. Khadka, Masatoshi Yanagida, Okkyun Seo, Kenjiro Miyano, Osami Sakata
Summary: An operando hard X-ray photoelectron spectroscopy (HAXPES) study was conducted to analyze the dynamics of ion species in a MAPbI3-xClx solar cell. Experimental core level analysis revealed that a threshold voltage above the open-circuit voltage (VOC) is required for iodide (I-) migration from HaP to adjacent transport layers. The study also demonstrated unidirectional diffusion of I- in AZO/PCBM and its absorption by the Ag layer to form AgI compound. The presence of an ITO layer was found to restrain AgI formation and improve cell performance.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Makoto Takayanagi, Takashi Tsuchiya, Daiki Nishioka, Masataka Imura, Yasuo Koide, Tohru Higuchi, Kazuya Terabe
Summary: The electrical response of the electric double layer (EDL) effect at the interface between a hydrogen-terminated diamond (H-diamond) and a Li+-conducting solid electrolyte LiNbO3 and Li3PO4 was investigated using an all-solid-state H-diamond-based EDL transistor (EDLT). Hall measurements showed that all EDLTs exhibited EDL-induced hole density modulation with a large EDL capacitance (CEDL) in the Li +-deficient region. Pulse response measurements indicated that the switching response speed was significantly influenced by the insertion of an LiNbO3 or Li3PO4 interlayer, particularly on the Li+ rich side.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Makoto Takayanagi, Daiki Nishioka, Takashi Tsuchiya, Masataka Imura, Yasuo Koide, Tohru Higuchi, Kazuya Terabe
Summary: All-solid-state electric double layer transistors (ASS-EDLTs) have attracted attention for their potential use in neuromorphic device applications, but their low switching response speed is a significant drawback. We demonstrated ultrafast-switching of ASS-EDLTs by combining hydrogenated diamond single crystal and a porous yttria stabilized zirconia thin film with high proton conductivity. The ASS-EDLT achieved a very short response time of less than a hundred ms (27 ms) at room temperature, which is much shorter than typical conventional ASSEDLTs.
MATERIALS TODAY ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Makoto Takayanagi, Takashi Tsuchiya, Daiki Nishioka, Tohru Higuchi, Kazuya Terabe
Summary: Amorphous ZrO2 and YSZ thin films were fabricated using PLD with an ArF excimer laser at room temperature to achieve high proton conductivity without high temperature annealing. The film density was modulated by varying the PO2 condition during deposition. The resulting porous thin films exhibited high proton conductivity near room temperature, surpassing that of polycrystalline YSZ pellets. The high proton conductivity is attributed to variations in porosity and local structure around Zr atoms controlled by PO2 levels. This study expands the applicability of proton-conducting solid electrolytes to various electrochemical devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Automation & Control Systems
Wataru Namiki, Daiki Nishioka, Yu Yamaguchi, Takashi Tsuchiya, Tohru Higuchi, Kazuya Terabe
Summary: Experimental verification is provided for crystal pipe computing using multi-detected nonlinear spin wave interference in a ferromagnetic single crystal. The computing system achieves excellent performance in hand-written digit recognition, second-order nonlinear dynamical tasks, and nonlinear autoregressive moving average (NARMA). The achieved performance is the best reported so far for any experimental physical reservoir, with low error rates achieved through higher nonlinearity and the large memory capacity of interfered spin wave multi-detection.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Automation & Control Systems
Tomoki Wada, Daiki Nishioka, Wataru Namiki, Takashi Tsuchiya, Tohru Higuchi, Kazuya Terabe
Summary: In this study, a physical reservoir computing method based on a redox-based ion-gating reservoir (redox-IGR) is demonstrated. The redox-IGR successfully solves a second-order nonlinear dynamic equation by utilizing voltage pulse driven ion-gating in a LixWO3 channel. The addition of I-G to the reservoir states enhances performance, resulting in a lower prediction error and increased memory capacity.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Daiki Nishioka, Takashi Tsuchiya, Tohru Higuchi, Kazuya Terabe
Summary: Artificial synapses capable of mimicking biological synapses have been developed using a H-x WO3-based all-solid-state redox transistor mechanism. The transistor operates by current pulse control and exhibits excellent synaptic properties. While the recognition accuracy for a handwritten digit recognition task is not ideal under voltage pulse control, achieving an accuracy of only 66%, it significantly improves to 88% with current pulse control. This result suggests the potential for further exploration and development of advanced neuromorphic systems, with the aim to revolutionize artificial intelligence.
NEUROMORPHIC COMPUTING AND ENGINEERING
(2023)
Article
Chemistry, Physical
Fumihiko Ichihara, Shogo Miyoshi, Takuya Masuda
Summary: The reaction of LiCoO2 (LCO) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) proceeds through multiple steps, as revealed by X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) analysis. The final products are LiCoPO4, CoTiO3, TiO2, and Li3PO4.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
