Article
Chemistry, Multidisciplinary
Eunseo Hwang, Yoonsu Park, Jongbae Kim, Taejong Paik, Don-Hyung Ha
Summary: The sulfurization reaction is considered a promising method for preparing metal sulfide nanomaterials. By using Na2S at room temperature, nanostructured copper sulfides can be synthesized with controllable morphology, composition, and optical properties. Key factors for designing nanostructured copper sulfides include reaction time and Na2S solution concentration.
Article
Materials Science, Multidisciplinary
Ryosuke O. Suzuki, Yuta Yashima, Takumi Kaneko, Eltefat Ahmadi, Tatsuya Kikuchi, Takafumi Watanabe, Genki Nogami
Summary: Silicon sulfide (SiS2) was synthesized using a precipitation method with Ar-CS2 gas mixture, resulting in the formation of white, needle-shaped SiS2 from silicon, silicon carbide, silicon nitride, and eutectic Al-Si liquid under specific conditions. The reaction pathway involves vaporization of SiS(g) and deposition as SiS2(s) from Si and CS2, with quartz remaining unaffected. However, the synthesis from eutectic Al-Si liquid was suppressed due to the formation of Al2S3.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Werner, Clarissa Glaser, Thomas Kasper, Trung Nghia Nguyen Le, Silvia Gross, Bernd M. Smarsly
Summary: The study focused on the precise detection of toxic gas H2S using CuO sensors, revealing that the decrease in sensing performance is mainly due to the irreversible formation of CuSO4 during regeneration. By developing strategies to reduce CuSO4 formation, the researchers were able to substantially maintain sensing stability and prolong sensor lifetime. The CuO-based dosimeters achieved a response time of just a few minutes for 10 ppm H2S and demonstrated prolonged life-time.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Wen Jiang, Lijun Zhang, Lixin Zhang
Summary: In this study, a series of compounds were synthesized and characterized. Based on the synthesis of a ligand-stabilized heteroleptic terminal alkyl lutetium complex, the difference in reactivity between aminobenzyl and methyl groups was proven, and the selective reactions and subsequent transformations were investigated.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Applied
Xinyi Zhang, Paul Bowyer, Geoffrey R. Scollary, Andrew C. Clark, Nikolaos Kontoudakis
Summary: This study examines the effectiveness of filtration for the removal of sulfide-bound copper in wine. It found that membrane filters are effective in removing copper in small volumes, while depth filters are more efficient in larger volumes.
Article
Chemistry, Analytical
Ziheng Wang, Jiaxi Liu, Lu Zhang, Wengui Nie, Jie Liu, Jiao Yang, Yingchun Li
Summary: A novel colorimetric sensor for H2S gas detection was constructed by incorporating copper(II) pyridine diazinonaphthol (Cu-PAN) complex into agarose hydrogel. The sensor exhibited superior sensing performance in terms of sensitivity, selectivity, response time, and simplicity due to the specific Cu-PAN complex and the excellent loading and diffusion functions provided by the hydrogel. A broad detection range of 1-50 ppm was achieved by this sensor. The feasibility of the Cu-PAN hydrogel sensor for the measurement of H2S level in human exhaled breath was validated. This work provides a new approach to design a green, simple, rapid, and sensitive tool for the detection of other gases.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Matthew S. Christian, Tina M. Nenoff, Jessica M. Rimsza
Summary: This study investigates the selectivity of rare earth 2,5-dihydroxyterephthalic acid (RE-DOBDC) metal-organic frameworks (MOFs) towards ternary gas mixtures (H2O-NO2-SO2) through ab initio molecular dynamic simulations (AIMD). It reveals that stronger gas-metal binding between H2O and the MOF arises from thermal vibrations, hindering the access of SO2 and NO2 molecules to the metal sites. Additionally, the study identifies multiple secondary gas species formed through gas-gas and gas-linker interactions within the MOF, and proposes a new de-protonation reaction mechanism.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Engineering, Environmental
Xiaoyu Meng, Hongbo Zhao, Yu Zhao, Li Shen, Guohua Gu, Guanzhou Qiu
Summary: A new three-step precipitation process is proposed to efficiently recover rare earth-citrate (RE-Cit) complexes from (bio)leaching lixivium. This technology shows promise in the industrial application of rare earth (bio) hydrometallurgy and wastewater treatment due to its advantages of high efficiency, low cost, environmental friendliness, and simple operation.
Article
Engineering, Environmental
Feng Zhu, Xingyun Hu, Linghao Kong, Xianjia Peng
Summary: The study developed a CaS-OSCS complex that can sustainably and stably release H2S under strongly acidic conditions, reduce H2S leakage during the precipitation of Cu(II) and As(III), improve the selective separation of copper from wastewater, providing a new approach for the elimination of H2S pollution and selective recovery of copper.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Polymer Science
Baiyi Shao, Xiaobao Zhang, Song Sang, Aoping Guo, Fangming Cui, Xiaojing Yang
Summary: The rare-earth hydroxides LEu(x)Tb(1-x)Hs nanosheets were stably isolated in polyvinyl alcohol (PVA) hydrogels via a freeze-thaw method, which inhibited the energy transfer from Tb3+ to Eu3+ and the Eu3+ concentration quenching effect, resulting in independent photoluminescence emissions of Eu3+ and Tb3+ and corresponding multicolor photoluminescence.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Physical
Shuqi Dong, Jinjin Chen, Kening Qiao, Jian Fang, Yan Yang, Laurent Maron, Bo Liu
Summary: This study focused on using rare-earth metal bisalkyl complexes to catalyze hydroamination reactions and investigated Th, Tb, and Gd-based catalysts for the first time. It was found that in intramolecular hydroamination, an increase in metal ion radius led to a linear increase in rate, while the reactivity pattern in intermolecular hydroamination showed the opposite trend with respect to ionic radius size.
Article
Multidisciplinary Sciences
Dmitri O. Charkin, Valeri A. Dolgikh, Timofey A. Omelchenko, Yulia A. Vaitieva, Sergey N. Volkov, Dina Deyneko, Sergey M. Aksenov
Summary: Our systematic explorations of the rare earth tellurite halide family have identified new representatives with strongly deficient and disordered metal-halide layers. The disorder increases with decreasing metal ion radius and size disagreements between the cationic and anionic layers. Analysis of the compounds' polytypism was performed using OD theory.
Article
Chemistry, Multidisciplinary
Kyung Su Kim, Nanasaheb M. Shinde, Je Moon Yun, Kwang Ho Kim
Summary: This study presents sulfur (S) and phosphorus (P) co-doped NiCo LDH nanoarrays prepared via a facile phosphor-sulfurization process, exhibiting faster and more efficient redox reactions and enhanced surface reactivity compared to pristine NiCo LDH. The co-doped NiCo LDH shows an ultra-high specific capacitance and excellent cycling stability, making it a promising electrode material for advanced energy storage applications.
Article
Materials Science, Ceramics
Renhan Li, Gongxun Bai, Hongbin Zhang, Enhai Song, Jiasong Zhang, Denghao Li, Junjie Zhang, Shiqing Xu
Summary: By coating with zinc oxide and depositing silicon dioxide, the stability of γ-Ce2S3 powders in humid, acidic, and high-temperature environments was significantly improved, making it feasible for coloring applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Sebastian Werner, Christoph Seitz, Giuliana Beck, Joerg Hennemann, Bernd M. Smarsly
Summary: Mesoporous SiO2 nanofibers were used to prepare CuO/SiO2 nanocomposites for gas sensing of H2S, exhibiting improved stability and performance compared to pure CuO materials. Further strategies for enhancing CuO-based sensors for H2S detection were indicated in the study.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Christophe Candolfi, Gabin Guelou, Cedric Bourges, Andrew R. Supka, Rabih Al Rahal Al Orabi, Marco Fornari, Bernard Malaman, Gerard Le Caer, Pierric Lemoine, Vincent Hardy, Jean-Marc Zanotti, Raju Chetty, Michihiro Ohta, Koichiro Suekuni, Emmanuel Guilmeau
PHYSICAL REVIEW MATERIALS
(2020)
Article
Physics, Condensed Matter
A. V. Sotnikov, V. V. Bakovets, Michihiro Ohta, A. Sh. Agazhanov, S. V. Stankus
PHYSICS OF THE SOLID STATE
(2020)
Article
Nanoscience & Nanotechnology
Wanthana Silpawilawan, Sora-at Tanuslip, Raju Chetty, Michihiro Ohta, Yuji Ohishi, Hiroaki Muta, Ken Kurosaki
ADVANCED ELECTRONIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Aleksandr Sotnikov, Priyanka Jood, Michihiro Ohta
Article
Chemistry, Physical
Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Andrew R. Supka, Raju Chetty, Emmanuel Guilmeau, Bernard Raveau, Marco Fornari, Michihiro Ohta, Rabih Al Rahal Al Orabi, Hikaru Saito, Katsuaki Hashikuni, Michitaka Ohtaki
Summary: A new member of colusite, Cu26Ti2Sb6S32, was designed in this study by incorporating Ti4+ and Sb5+ cations into the structure, leading to improved thermoelectric performance, providing new possibilities for energy conversion and optoelectronic applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yuta Shimizu, Koichiro Suekuni, Hikaru Saito, Pierric Lemoine, Emmanuel Guilmeau, Bernard Raveau, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki
Summary: The study demonstrated that by substituting antimony for germanium and introducing copper as an interstitial atom, the thermoelectric performance of Cu26V2Ge6S32 colusite can be enhanced. This resulted in a decrease in hole carrier concentration, reduction in electronic thermal conductivity, and increase in the dimensionless thermoelectric figure of merit ZT from 0.3 to 0.8 at 673 K.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki
Summary: The electronic structures of Cu2TryTi4-yS8 thiospinels were studied using a combination of thermoelectric measurements and first-principles calculations. Substituting Sc and Co for Ti reduced electron carrier concentration, leading to increased electrical resistivity and Seebeck coefficient. Co-substituted samples showed remarkably enhanced Seebeck coefficient at 673 K, resulting in higher dimensionless thermoelectric figure of merit.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
Sylvain Le Tonquesse, Yoshitaka Matsushita, Priyanka Jood, Michihiro Ohta, Takao Mori, David Berthebaud
Summary: Metallization of undoped CrSi2 with Ti and Nb was explored in this study, with Ti showing strong adhesion and negligible electrical contact resistance, while Nb resulted in cracks and Si diffusion. The research aims to initiate the development of more reliable and efficient CrSi2 thermoelectric legs with an optimized design.
Article
Physics, Applied
Raju Chetty, Priyanka Jood, Masayuki Murata, Koichiro Suekuni, Michihiro Ohta
Summary: This study demonstrates the thermoelectric power generation capability of a prototype pi-shaped module composed of p-type colusite and n-type nanostructured PbTe, and evaluates the thermoelectric performance of the materials. The optimal working temperature and thermoelectric conversion efficiency for Cu26Cr2Ge6S32 and Pb0.98Ga0.02Te-3% GeTe are determined.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Shota Hirayama, Koichiro Suekuni, Philipp Sauerschnig, Michihiro Ohta, Michitaka Ohtaki
Summary: In this study, the thermoelectric properties of Cu-S-based semiconducting compound and its hole-doped derivatives were synthesized and tested. Hole-carrier doping effectively reduced electrical resistivity and improved power factor. The Ti-doped compound showed better thermoelectric performance due to its low lattice thermal conductivity and improved power factor.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Philipp Sauerschnig, Priyanka Jood, Michihiro Ohta
Summary: For decades, efforts have been made to improve the thermoelectric figure of merit zT of lead telluride (PbTe)-based materials. However, their applications have been limited to space probes and remote locations. One of the obstacles in implementing thermoelectrics is establishing stable electrical and thermal contacts between PbTe-based materials and electrodes. This review summarizes the challenges and recent progress in bonding PbTe and contact layer, focusing on contact resistance, chemical stability, and mechanical stability.
Article
Materials Science, Multidisciplinary
Philipp Sauerschnig, Priyanka Jood, Michihiro Ohta
Summary: By adjusting the Na doping content, the material stability and mechanical properties of nanostructured p-type Pb0.993-xNaxGe0.007Te are improved while maintaining a high thermoelectric figure of merit zT. The presence of detrimental Na-rich impurity phases is eliminated by reducing the Na doping from 4% to 2%. Co80Fe20 contact layers improve the conversion efficiency of Pb0.973Na0.02Ge0.007Te and Pb0.98Ga0.02Te.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Carmelo Prestipino, Erik Elkaim, Andrew R. Supka, Rabih Al Rahal Al Orabi, Marco Fornari, Emmanuel Guilmeau, Bernard Raveau, Hikaru Saito, Philipp Sauerschnig, Michihiro Ohta, Yui Kanemori, Michitaka Ohtaki
Summary: Copper-based sulfide Cu(3)0Ti(6)Sb(2)S(32) with a colusite-like cubic structure is synthesized and characterized in this study. The electronic structure and vibrational properties are investigated using experiments and first-principles calculations. The design approach based on the pseudobinary composition is demonstrated to be a promising direction for the discovery of new copper-based sulfides with tunable transport properties.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Sylvain Le Tonquesse, Hugo Bouteiller, Yoshitaka Matsushita, Araseli Cortez, Sabah K. Bux, Kazuki Imasato, Michihiro Ohta, Jean-Francois Halet, Takao Mori, Franck Gascoin, David Berthebaud
Summary: This article introduces a high-temperature thermoelectric material Yb4Sb3 and its application in the fabrication of high-temperature thermoelectric modules. It is found that the doping strategy can improve the figure-of-merit of the thermoelectric material through the study of doubly doped CexYb4-xBi0.2Sb2.8 compounds. Furthermore, the study of metallic contact screening for the thermoelectric module successfully produced stable contacts for the thermoelectric legs.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Kazuki Imasato, Philipp Sauerschnig, Shashwat Anand, Takao Ishida, Atsushi Yamamoto, Michihiro Ohta
Summary: In this study, triple half-Heusler compound Mg2VNi3Sb3 with unconventional valence balance strategy was successfully synthesized. It exhibits semiconductor behavior with a small bandgap and low lattice thermal conductivity. This research demonstrates a new strategy for further improvement of thermoelectric performance and extended tunability of intermetallic compounds.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
