Article
Chemistry, Physical
Bo-Yang Tsai, Shi-Kai Jiang, Yi-Tzu Wu, Jing-Sen Yang, She-Huang Wu, Ping-Chun Tsai, Wei-Nien Su, Ching-Yu Chiang, Bing Joe Hwang
Summary: The sulfide-based solid-state electrolyte has attracted attention as a potential material for next-generation all-solid-state batteries. However, interfacial reactions between the electrolyte and the cathode during cycling can be a serious issue. Resolving these reactions is crucial for the development of solid-state batteries.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Nicolas Couture, Wei Cui, Markus Lippl, Rachel Ostic, Defi Junior Jubgang Fandio, Eeswar Kumar Yalavarthi, Aswin Vishnuradhan, Angela Gamouras, Nicolas Y. Joly, Jean-Michel Menard
Summary: Slow motion movies can be used to monitor low-energy resonances and reveal fast structural or chemical transitions by replacing images with terahertz waves. By combining THz spectroscopy with a real-time monitoring technique, we have demonstrated the ability to resolve non-reproducible phenomena at 50k frames per second. Our experimental configuration using the photonic time-stretch technique allows for unprecedented data acquisition speeds and enables the study of fast irreversible processes at THz frequencies.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Wen Guan, Xiaoyu Liao, Ziping Li, Wenjian Wan, Kang Zhou, Yiran Zhao, Chenjie Wang, Xuhong Ma, Shumin Wang, J. C. Cao, Dong Xu, Junwen Zhang, Nan Chi, Hua Li
Summary: In this study, a laser beating experiment was conducted to investigate the frequency tuning characteristics of terahertz quantum cascade lasers induced by temperature or drive current. The experimental results revealed that the frequency tuning coefficients of terahertz QCL are 6.1 MHz/0.1 K (temperature tuning) and 2.7 MHz/mA (current tuning) within the investigated ranges, showing potential applications in high precision linewidth measurements and multi-channel terahertz communications.
Review
Polymer Science
Gabrielle Foran, Nina Verdier, David Lepage, Cedric Malveau, Nicolas Dupre, Mickael Dolle
Summary: Solid-state NMR spectroscopy is an established experimental technique used to characterize the structural and dynamic properties of materials, including lithium and sodium-based solid electrolytes. This review discusses various solid-state NMR experiments commonly used in polymer and hybrid electrolyte systems, providing examples and discussing the strengths and weaknesses of each technique. It aims to assist in selecting appropriate solid-state NMR experiments for analyzing these systems.
Article
Optics
Qinggang Lin, Xinming Yuan, Xuanke Zeng, Yatao Yang, Yi Cai, Xiaowei Lu, Maijie Zheng, Congying Wang, Wenhua Cao, Shixiang Xu
Summary: This paper presents a novel design for single-shot terahertz polarization detection based on terahertz time-domain spectroscopy. Its validity has been confirmed by comparing its detection results with those of the THz common-path spectral interferometer, and the results show that its signal-to-noise ratios are superior to those of the 45 degrees optical bias THz-TDS. The setup works without the need for optical scan and is suitable for applications with poor or no repeatability.
PHOTONICS RESEARCH
(2022)
Review
Electrochemistry
Huixiang Liu, Xian Zhou, Mingxin Ye, Jianfeng Shen
Summary: In this review, the latest research progress on hydroborate/carborate electrolytes is summarized, with emphasis on the mechanisms, characterization techniques, and theoretical calculations underlying their high ionic conductivity. General guidelines and novel strategies are proposed to address the challenges and achieve further development of hydroborate/carborate electrolytes.
ELECTROCHEMICAL ENERGY REVIEWS
(2023)
Article
Chemistry, Analytical
Hungyen Lin, Benjamin P. Russell, Prince Bawuah, J. Axel Zeitler
Summary: This study demonstrates the sensitivity of terahertz technology in measuring water absorption, comparing it to conventional gravimetric analysis to investigate the variation of water content in simple and commercial epoxy systems.
ANALYTICAL CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Miao Guo, Chongyang Yuan, Tengfei Zhang, Xuebin Yu
Summary: This review summarizes the development and classification of magnesium-ion solid-state electrolytes and discusses the migration mechanism and structural characteristics of Mg2+ ions.
Article
Optics
Laleh Mohtashemi, Paul Westlund, Derek G. Sahota, Graham B. Lea, Ian Bushfield, Payam Mousavi, J. Steven Dodge
Summary: The presented maximum-likelihood method offers superior parameter estimation in terahertz time-domain spectroscopy and provides a reliable measure of the goodness of fit. Additionally, a simple noise model parameterized by three dominant sources is developed, offering an effective means of estimating materials characteristics.
Article
Chemistry, Multidisciplinary
Daniel Molter, Daniel Huebsch, Thorsten Sprenger, Korbinian Hens, Konstantinos Nalpantidis, Frank Platte, Garik Torosyan, Rene Beigang, Joachim Jonuscheit, Georg von Freymann, Frank Ellrich
Summary: Terahertz time-domain spectroscopy is utilized for spectral investigation of materials covered by visibly opaque objects, making it ideal for inspecting mail content. Research on mail inspection in this spectral range includes machine design, optical layouts, data analysis, and implementation.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Young Gyun Choi, Jong Chan Shin, Anseong Park, Young Min Jeon, Jin Il Kim, Sebin Kim, Seulwoo Kim, Won Bo Lee, Minjae Lee, Jong Hyeok Park
Summary: A semi-interpenetrating polymer network (semi-IPN) ion-transporting solid film using a new material named P(N)PEG is reported in this study to enhance the performance of lithium metal batteries. P(N)PEG exhibits good ability to solvate Li+ and the semi-IPN electrolyte shows excellent ionic conductivity and lithium ion transport properties.
ADVANCED ENERGY MATERIALS
(2021)
Article
Multidisciplinary Sciences
Pinar Aydogan Gokturk, Rahul Sujanani, Jin Qian, Ye Wang, Lynn E. Katz, Benny D. Freeman, Ethan J. Crumlin
Summary: Donnan electrical potential, which describes ion distribution between two solutions separated by a permeable membrane, has been directly measured and compared with theoretical models in this study. The results highlight the dependence of the Donnan potential on external salt concentration and counter-ion valence, and show a reasonable agreement with current theoretical models.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Alex M. Potts, Abhay K. Nayak, Michael Nagel, Kelson Kaj, Biljana Stamenic, Demis D. John, Richard D. Averitt, Andrea F. Young
Summary: Free-space time domain THz spectroscopy is suitable for studying electrodynamic responses in condensed matter systems. However, it becomes challenging for samples smaller than the diffraction limit. In this study, we propose an on-chip THz spectrometer with a bandwidth of 200 to 750 GHz. By using this spectrometer, we are able to measure the optical conductivity of a narrow NbN film and observe spectroscopic signatures of the superconducting gap.
Article
Optics
Kai Kang, Yufeng Du, Shibin Wang, Lin An Li, Zhiyong Wang, Chuanwei Li
Summary: The paper proposes a full-field stress measuring method using terahertz time-domain spectroscopy, based on the stress-optical law. The method is experimentally validated and shows reasonable agreement between experimental results and theoretical solutions.
Article
Spectroscopy
Lei Hou, Wei Shi, Chengang Dong, Lei Yang, Yuezheng Wang, Haiqing Wang, Yuhua Hang, Fei Xue
Summary: This study introduces a new method for detecting the THz spectra of hydrated substances, which uses a specially designed waveguide to enhance THz waves and achieve the detection of hydrated substances in a THz time-domain spectroscopy system. The successful detection of alpha-lactose dilute solution was demonstrated in the experiment, showcasing the potential application prospects of this method in the future.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Physics, Applied
Eiichi Matsubara, Masaya Nagai, Masaaki Ashida
Summary: Using a biased single crystal of diamond as a nonlinear medium, ultrabroadband infrared pulses generated through two-color pumped air plasma were coherently detected in a spectral range of 1-100 THz. The sensitivity was increased significantly compared to traditional air detection methods, even at higher probe pulse energy levels.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Naoki Tanimoto, Masaya Nagai, Masaaki Ashida, Yuji Okuyama, Yukimune Kani
Summary: The photoluminescence in solid electrolytes is shown to be sensitive to the atomic structure of the defect complex which determines ionic conduction. By comparing photoluminescence spectra, specific atomic arrangements associated with each sample's photoluminescence characteristics can be identified based on previous investigations.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Junji Hyodo, Shogo Kato, Shintaro Ida, Tatsumi Ishihara, Yuji Okuyama, Takaaki Sakai
Summary: Proton-conducting oxides have attracted attention as electrolyte materials for electrochemical devices operating at intermediate temperatures. Quantifying oxygen ion transport number is crucial for predicting fuel utilization efficiency in solid oxide fuel cells (SOFCs). This study evaluated the oxygen ion conductivities in Ba-doped LaYbO3 and revealed that proton conduction dominates in wide areas, particularly at temperatures below 600 degrees C.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Keita Miyagawa, Masaya Nagai, Masaaki Ashida, Changsu Kim, Hidefumi Akiyama
Summary: The magneto-optical Kerr effect at normal incidence in the terahertz frequency range is useful for evaluating carrier transport properties in specific layers of a p-n junction. Enhanced electric field at the p-layer in a p-n junction allows for higher sensitivity magneto-optical Kerr spectroscopy. Numerical calculations and experimental measurements can be used to determine carrier densities of n- and p-layers in GaAs epitaxial layers and devices with a p-i-n structure. This method offers high spatial resolution for imaging large-area devices.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2021)
Article
Physics, Applied
Masaya Nagai, Yuto Furutani, Hikaru Takehara, Tomohide Morimoto, Masaaki Ashida, Yuji Okuyama, Yukimune Kani
Summary: Terahertz conductivity of doped ceria was measured at different temperatures, showing higher activation energy in doped ceria compared to stabilized zirconia, possibly due to lattice expansion. Terahertz spectroscopy can also be used to study fast microscopic ionic conduction in solid-oxide electrolytes, inaccessible through conventional impedance measurements.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Yosuke Minowa, Xi Geng, Kokado Keisuke, Kentaro Sato, Tatsuya Kameyama, Tsukasa Torimoto, Masaaki Ashida
Summary: This study demonstrates the optical trapping of metallic and dielectric nanoparticles in superfluid helium, providing a new approach for studying nanoscopic quantum hydrodynamic effects and interactions between quantum fluids and classical nanoobjects.
Article
Multidisciplinary Sciences
Yosuke Minowa, Shota Aoyagi, Sosuke Inui, Tomo Nakagawa, Gamu Asaka, Makoto Tsubota, Masaaki Ashida
Summary: Impurity injection into superfluid helium is a method with diverse applications, but the interaction mechanism with dense materials is still unclear. This study provides experimental evidence of the attraction between dense silicon nanoparticles and quantized vortex cores, and observes the phenomenon of quantized vortex reconnection.
Article
Instruments & Instrumentation
Y. Minowa, K. Kato, S. Ueno, T. W. Penny, A. Pontin, M. Ashida, P. F. Barker
Summary: This study demonstrates a camera-based feedback cooling scheme for controlling charged nanoparticles levitated in a linear Paul trap. The scheme utilizes real-time image processing and feedback signal transmission to the trap electrodes for cooling effects, and is applicable for controlling low-frequency mechanical oscillators.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Physical
Hikaru Takehara, Masaya Nagai, Masaaki Ashida, Yuji Okuyama, Yukimune Kani
Summary: Yttrium-doped barium zirconate, a solid electrolyte with advantageous properties for fuel cells, was characterized using photoluminescence and photoluminescence excitation spectra to understand the atomic arrangement near the oxygen vacancy. The study found that the photoluminescence spectra consisted of recombination at the grain boundary region, recombination at a vacancy defect with an unpaired electron, and the transition of the electronic state of the oxygen vacancy. By analyzing the peak position and corresponding excitation spectrum, information on the atomic arrangement adjacent to the oxygen vacancies, which is crucial for designing materials with high protonic conductivity, was obtained.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Hirofumi Sumi, Hiroyuki Shimada, Konosuke Watanabe, Yuki Yamaguchi, Katsuhiro Nomura, Yasunobu Mizutani, Yuji Okuyama
Summary: This study investigates the effect of polarization resistances on current leakage and the distribution of relaxation times (DRT) analysis of electrochemical impedance spectra (EIS) for solid oxide cells (SOCs) with GDC electrolyte and protonic ceramic cells (PCCs) with BZYb electrolyte. The results show that the polarization resistances increase with increasing current density in SOC with GDC electrolyte, but exhibit the opposite tendency in PCC with BZYb electrolyte. This suggests that the effect of current leakage on polarization resistance is related to the conductivity of the electrolyte.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Hikaru Takehara, Masaya Nagai, Masaaki Ashida, Yuji Okuyama, Yukimune Kani
Summary: We demonstrate that protons strongly inhibit certain phonons in hydrated barium zirconate. By conducting terahertz spectroscopy and infrared reflection spectroscopy measurements on anhydrous and hydrous acceptor-doped barium zirconate sintered pellets, we provide evidence for this effect. Last and Slater phonon modes are significantly suppressed with proton doping, while phonons are not damped with trivalent dopants. This phenomenon is attributed to the picosecond motion of protons, such as hydroxyl rotation and attempt motion of proton hopping, coupled with the phonon.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Electrochemistry
Yuji Okuyama, Yoshiaki Harada, Yuichi Mikami, Kosuke Yamauchi, Tomohiro Kuroha, Hiroyuki Shimada, Yuki Yamaguchi, Yasunobu Mizutani
Summary: A proton current detector was developed using a proton conducting oxide to measure the proton current in a PCFC. An apparatus based on the electromotive force of an electrochemical cell was used to measure the amount of proton current flowing in the PCFC. The hydrogen ion current was determined by monitoring the water vapor pressure.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Yuji Okuyama, Keita Kasuga, Masaki Shimomura, Yuichi Mikami, Kosuke Yamauchi, Tomohiro Kuroha, Hirofumi Sumi
Summary: This study investigates the elementary reactions occurring within the electrode impedance of proton-conducting ceramic fuel cells. By observing the change in components when the gas on the anode was switched from light hydrogen to heavy hydrogen during the power generation and shutdown phases of the fuel cell, impedance components attributable to the steam production reaction were identified.
JOURNAL OF POWER SOURCES
(2023)
