Article
Chemistry, Physical
Yoko Fukui, Yukihiro Yoshida, Hiroshi Kitagawa, Yohei Jikihara
Summary: A systematic study was conducted on the Ag+-ion conducting behavior in AgI-loaded mesoporous aluminas (MPAs) in the sub-10 nm region. The highest conductivity was found when AgI was loaded into MPA with pore diameter of 7.1 nm (7.2 x 10-4 S cm-1 at 25 °C).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Tomoaki Sakurada, Yeongsu Cho, Watcharaphol Paritmongkol, Woo Seok Lee, Ruomeng Wan, Annlin Su, Wenbi Shcherbakov-Wu, Peter Mueller, Heather J. Kulik, William A. Tisdale
Summary: This work reports a chemically robust yellow emissive one-dimensional (1D) semiconductor, silver 2,6-difluorophenylselenolate-AgSePhF2(2,6), which belongs to the class of hybrid low-dimensional semiconductors. Introduction of fluorine atoms at the (2,6) position of the phenyl ring induces a structural transition from 2D sheets to 1D chains. AgSePhF2(2,6) exhibits strongly dispersive conduction and valence bands along the 1D crystal axis. Visible photoluminescence with prompt and delayed components is observed at room temperature.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
S. Dimitrovska-Lazova, M. Bukleski, P. Tzvetkov, M. Pecovska-Gjorgjevich, D. Kovacheva, S. Aleksovska
Summary: This study investigates the isostructural phase transition detected in GUPbI3 for the first time and presents some properties related to this transition, deducing the existence of a new phase through temperature dependent isosbestic point in infrared spectra and analysis of Raman spectroscopy. Powder X-ray diffraction patterns show that the phase transition does not change the space group of the perovskite structure, making it an isostructural transition, and no additional peak was detected in differential thermal analysis at this temperature. Electrical measurements were conducted to relate the phase to the application of GUAPbI3 in solar cells, and UV/Vis spectra were recorded with the band gaps calculated.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Sandy Sanchez, Stefania Cacovich, Guillaume Vidon, Jean-Francois Guillemoles, Felix Eickemeyer, Shaik M. Zakeeruddin, Jurgen E. K. Schawe, Jorg F. Loffler, Cyril Cayron, Pascal Schouwink, Michael Graetzel
Summary: We employed flash infrared annealing to investigate the phase transition of formamidinium lead triiodide thin films for solar cell applications. By optimizing the film crystallization processing parameters, we achieved highly stable black perovskite solar cells with a high power conversion efficiency.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Sebastian Ehrling, Hiroki Miura, Irena Senkovska, Stefan Kaskel
Summary: Metal-organic frameworks (MOFs) have shown great potentials in energy storage, separation, sensing, and catalysis, and integrating such materials into thin films and biological applications through nanostructuring is crucial. However, downsizing below critical dimensions can lead to dramatic changes in MOF's dynamic behavior and responsiveness towards external stimuli.
TRENDS IN CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
S. Shanmuga Sundari, N. Arunadevi, P. Kanchana, P. Meena, E. Ranjith Kumar, Hosam O. Elansary, Eman A. Mahmoud, Shaimaa A. M. Abdelmohsen
Summary: In this study, the synthesis of glycine phosphite (GPI) crystals was successfully achieved, and the crystals doped with different acids were analyzed using various testing methods. The results showed that doping acids had an impact on the mechanical stability and thermal properties of the crystals.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Christopher D. Wight, Qifan Xiao, Holden R. Wagner, Eduardo A. Hernandez, Elizabeth Martin, Vincent M. Lynch, Brent L. Iverson
Summary: This study reports a series of monoalkoxynaphthalene-naphthalimide (MAN-NI) donor-acceptor dyads that undergo a unique orange-to-yellow thermochromic transition in the solid state. Symmetric and asymmetric alkyl side chain derivatives were studied, and it was found that the length of the alkyl side chains influenced the structures, properties, and dynamic behavior of the resulting solids. The results demonstrate the general nature of the thermochromic color-changing mechanism in the MAN-NI dyads and the link between alkyl side chain interactions and the stimuli-responsive behavior in the solid state.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Ji-Hyun Cha, Jong Yun Kim, Young-Jun Yu, Duk-Young Jung
Summary: In this study, a Cu-substituted beta-Ag0.7Cu0.3I solid electrolyte was successfully prepared by sequential deposition of a Cu metal layer onto an AgI thin film. This Cu substitution improved the resistive switching properties of intrinsic polycrystalline AgI thin films and resulted in enhanced performance of ReRAM thin film devices based on beta'-Ag0.7Cu0.3I, with high ON/OFF ratio and low working voltage. These findings suggest that binary metal halide materials can be used for efficient formation of metal filaments and have potential applications in low-cost, low-power memory.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yuqiao Zhang, Hai Jun Cho, Feng Jiang, Chengliang Xia, Yue Chen, Weishu Liu, Hiromichi Ohta
Summary: The modulation of electrical and thermal conductivities of BTNO epitaxial films was systematically investigated in this study. By controlling the Ti/Nb ratio, both the lattice structures and conduction band were modulated, affecting the electrical and thermal conductivities. A phase transition was detected at x similar to 0.5, impacting both the electron and heat transports. By controlling the lattice distortion, conduction band, and phase transition, the electrical and thermal conductivity of BTNO epitaxial films can be modulated within a much greater range.
Article
Polymer Science
Hajime Kishi, Takashi Saruwatari, Takemasa Mototsuka, Sanae Tanaka, Takeshi Kakibe, Satoshi Matsuda
Summary: The study investigated the thermal conductivity of DGEBA/DDM/PES/Ag filler composites. The co-continuous phase structures formed during curing, with Ag fillers sintering in epoxy-rich phases and experiencing enhanced contact opportunities. The enhanced thermal conductivities were attributed to the synergistic effect of phase structures and in situ sintering of Ag fillers.
Article
Materials Science, Multidisciplinary
D. P. Kozlenko, N. T. Dang, S. E. Kichanov, L. T. P. Thao, A. Rutkaukas, E. Lukin, B. N. Savenko, N. Tran, D. T. Khan, L. Truong-Son, L. H. Khiem, B. W. Lee, T. L. Phan, N. L. Phan, N. Truong-Tho, N. N. Hieu, T. A. Tran, M. H. Phan
Summary: This study systematically investigates the crystal and magnetic structures of Mn3O4 under high pressure. The compression process leads to structural transformations and suppression of low-temperature antiferromagnetic orders, while increasing the magnetic ordering temperature. These experimental findings are supported by density functional theory calculations.
Article
Multidisciplinary Sciences
Jing Gao, Wei Li, Jue Liu, Qian Li, Jing-Feng Li
Summary: Antiferroelectrics have attracted increasing research interests due to their potential in energy storage applications and intriguing structural characteristics. This study investigates the atomic structure and evolution of AgNbO3-based antiferroelectrics upon La doping using local-structure methods. The results reveal a correlation between cation displacements and the disruption of these displacements by La incorporation, which may explain the observed anomalous dielectric properties. Additionally, spatial ordering of cation vacancies and coordination with oxygen octahedral tilting are observed in La-doped samples, relieving lattice strain.
Article
Multidisciplinary Sciences
Wei Qin, Wajid Ali, Jianfeng Wang, Yong Liu, Xiaolan Yan, Pengfei Zhang, Zhaochi Feng, Hao Tian, Yanfeng Yin, Wenming Tian, Can Li
Summary: The authors manipulated ferroelastic lattice deformation using electric fields to study non-radiative recombination and strain in twinning tetragonal phase, leading to an increased open-circuit voltage of 1.26 V. This study provides insights into the low non-radiative recombination in metal halide perovskite solar cells.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yuki Nagumo, Hiroshi Yao
Summary: The characteristic features of magnetoplasmonic responses in higher-order multipolar modes of Ag nanoparticles were demonstrated for the first time using MCD spectroscopy. The octupolar plasmonic extinction in Ag nanoparticles was found to be weak and almost unresolved in optical extinction spectra, but showed a sharp and intense peak in MCD responses. This unique behavior was attributed to the sensitivity and enhanced spectral resolution of MCD, as well as the size and shape inhomogeneity of the nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Ceramics
Zenghui Liu, Jun Xu, Junni Zhai, Zhixuan Guo, Hongyan Wan, Tao Xue, Jingrui Li, Gang Niu, Peng Shi, Lingyan Wang, Wei Ren, Bian Tian, Hongzhong Liu, Zhuangde Jiang, Zuo-Guang Ye
Summary: Preparation condition plays a critical role in the structure and properties of ceramics. In this study, the effects of sintering temperature on the crystal structure, microstructure, and electrical conductivity of LaCrO3-based conducting oxides were investigated. It was found that the calcining temperature can be reduced by using nano-powders as raw materials. The sintering temperature-induced structural transition and the enhancement of electrical conductivity by introducing Sr and Ca ions were also observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(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, Multidisciplinary
Jin Su, Tohru Tsuruoka, Takuji Tsujita, Yuu Inatomi, Kazuya Terabe
Summary: Solid-state batteries using solid electrolytes have higher capacity and better safety. This study demonstrates a low-temperature atomic layer deposition (ALD) process for producing nitrogen-incorporated magnesium phosphorus oxynitride (MgPON) solid-state electrolyte (SSE) thin films. The ALD MgPON SSEs exhibit high ionic conductivity and can be used as protective or wetting interlayers in solid-state Mg and Li batteries.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
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
Chemistry, Physical
Kyoungwoong Kang, Chenke Tang, Jeong Hun Kim, Woo Jin Byun, Jin Ho Lee, Min Hee Lee, Hemin Zhang, Jae Sung Lee
Summary: In this study, a highly crystalline p-CaFe2O4 shell was formed on the surface of n-Ta:Fe2O3 nanorods to create Ta:Fe2O3@CaFe2O4 core-shell nanorod p-t-n heterojunction photoanodes. The optimized photoanode loaded with the FeNiOx cocatalyst exhibited improvements in photocurrent density, onset potential, and long-time stability compared to bare hematite and other reported hematite-based heterojunction photoanodes.
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
Nanoscience & Nanotechnology
Samapika Mallik, Tohru Tsuruoka, Takashi Tsuchiya, Kazuya Terabe
Summary: In this study, the effect of Mg doping on the LiCoO2 channel in a Li ion-gated synaptic transistor was investigated. The results showed that Mg doping increased the initial channel conductance and improved the retention characteristics and linearity of long-term potentiation and depression. The doped channel transistor also demonstrated a higher image recognition accuracy and improved short-term plasticity. These findings suggest that elemental doping can be a useful procedure for realizing robust neuromorphic systems based on analog computing.
ACS APPLIED MATERIALS & INTERFACES
(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
Chemistry, Physical
Weicong Li, Hongying Guo, Chenyang Xu, Chenke Tang, Jae Sung Lee, Hemin Zhang
Summary: This study demonstrates the fabrication of an ultrathin amorphous hafnium oxide hole storage layer (HSL) through a combined strategy of hybrid microwave annealing and in-situ dopants. The HSL enhances the photoelectrochemical performance by promoting efficient charge separation, and shows high potential for solar energy conversion.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
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
Materials Science, Multidisciplinary
Samapika Mallik, Priyanka Priyadarshani Samal, Anwesha Mahapatra, Itishree Pradhan, Mosim Ansari, Neeladri Das, Puneet Mishra, Tohru Tsuruoka, Kazuya Terabe, Alpana Nayak
Summary: The novel triptycene-based azo polymer was investigated as a switching material in an atomic switch, exhibiting volatile and nonvolatile switching behaviors, with potential applications in organic neuromorphic electronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
