Review
Chemistry, Inorganic & Nuclear
Kenton H. Whitmire, Kathryn Wall
Summary: The oxido clusters of bismuth have attracted increasing attention in recent decades. This is due to the use of bismuth compounds as pharmaceuticals and their interesting properties. The structures of the oxido species are similar to solid state bismuth oxides, and the chemistry of the oxido clusters is closely related to the coordination chemistry of bismuth. Various ligands have been used to support the formation of these structures. The review summarizes the synthetic methods, physical and chemical properties, and structures of bismuth oxido clusters.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Materials Science, Ceramics
Yasir Abbas, M. Anis-ur-Rehman
Summary: The double perovskite Bi2Ca2-xCexCoO6; x = 0.00, 0.05, 0.10 and 0.15 (BCCCO) is synthesized using co-precipitation route. Ce doping leads to a decrease in crystallite size and an increase in dielectric permittivity. The conductivity mechanism and thermal conductivity are found to be dependent on the Ce doping concentration.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Naoki Kawano, Kenji Shinozaki, Masaki Akatsuka, Hiromi Kimura, Daisuke Nakauchi, Takayuki Yanagida
Summary: Glass compounds, specifically Eu2O3-doped bismuth gallate glasses, have been synthesized for scintillator applications, showing promising photoluminescence and scintillation characteristics related to the transitions of Eu3+. The concentration-dependent PL quantum efficiency and scintillation intensity of the glasses were found to be correlated, with decay time constants of approximately 0.55 ms and 0.15 ms for different doping levels under visible light and X-ray irradiation. The afterglow levels of the glasses were moderate and comparable to those of Tl-doped CsI.
CERAMICS INTERNATIONAL
(2021)
Article
Environmental Sciences
Selda Topcu Sendogdular, Levent Sendogdular
Summary: Ce-doped TiO2/zeolite fibers were synthesized for the removal of indigo dye, and the results showed that 3% Ce-doped fibers exhibited the highest photocatalytic activity, with a high degradation rate even after four cycles.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Amit Yadav, Nikolai B. Chichkov, Regina Gumenyuk, Harri Ali-Loytty, Kimmo Lahtonen, Mika Valden, Mikhail A. Melkumov, Mikhail V. Yashkov, Evgeny Zherebtsov, Edik U. Rafailov
Summary: The study investigates the fluorescence characteristics of a purely Ce-doped silica fiber, showing broad-bandwidth fluorescence across the visible and near-infrared with confirmed purity and Ce valence state. The optimal pump wavelength for broadest luminescence is found to be between 405 nm to 440 nm, resulting in broad-bandwidth fluorescence with spectral widths up to 301 nm under specific pump power and fiber length conditions.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Chemistry, Applied
Paula Caregnato, Karolth R. Espinosa Jimenez, Paula Villabrille
Summary: This study synthesized cerium-doped zinc oxide materials using zinc acetate precursor at pH 4 and 8, and characterized their photocatalytic activity. The catalyst obtained at pH 8 showed higher photocatalytic performance, removing 53% of carbamazepine within 180 min under visible light irradiation. The doped samples also exhibited decreased photodissolution of ZnO compared to undoped samples.
Article
Engineering, Environmental
Yang Zhang, Baozhong Ma, Shuang Shao, Bingding Shi, Xiang Li, Chengyan Wang, Yongqiang Chen
Summary: Waste acid contains harmful chloride, and this study investigates the use of bismuth oxide for its removal. The dechlorination mechanism involves the complexation and precipitation of bismuth oxychloride. Regenerated bismuth oxide shows excellent dechlorination effect.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Omar K. Farha, Xingjie Wang, Haomiao Xie, Julia G. Knapp, Megan C. Wasson, Yufang Wu, Kaikai Ma, Aaron E. B. S. Stone, Matthew D. Krzyaniak, Yijing Chen, Xuan Zhang, Justin M. Notestein, Michael R. Wasielewski
Summary: Ceria-based materials are highly desirable in photocatalytic reactions due to their redox properties and oxygen storage ability. In this study, CeCe70 and MCe70 clusters (M = Cu, Ni, Co, and Fe) were structurally characterized and found to exhibit enhanced reactivity and improved aldehyde selectivity. Mechanistic studies revealed the importance of oxygen defects and specific transition metal introduction for efficient photocatalysis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Ceramics
Evgeny A. Plastinin, Liudmila D. Iskhakova, Pavel F. Kashaykin, Vladimir V. Velmiskin, Sergei Firstov, Filipp O. Milovich
Summary: The Ce-doped consolidated glass and optical fibers were synthesized using nanoporous glass impregnated with a cerium selenate solution. The study investigated the thermal decomposition process and optical properties of the synthesized materials. The results showed that high-temperature treatment improved the homogeneity of the glass and enhanced its luminescence. Additionally, the Ce-doped nanoporous material showed potential for producing optical fibers for dosimetry.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
M. Camacho-Lopez, M. Ballesteros-Balbuena, A. Esparza-Garcia, M. Flores-Castaneda, S. Camacho-Lopez, M. A. Camacho-Lopez
Summary: This study focuses on the phase transition from bismuth to β-Bi2O3 by gradually heating the bismuth film. The results show that by carrying out the oxidation process at a low temperature, pristine bismuth can be transformed into β-Bi2O3. The transformation was characterized using various techniques, and the method shows feasibility and simplicity for the synthesis of β-Bi2O3.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Coatings & Films
Housei Akazawa
Summary: In this study, Er3+-doped Bi2O3 films were prepared on Si substrates using H2O vapor as an oxygen source. The crystal phase could be controlled by adjusting H2O pressure and postannealing temperature. The optimum annealing temperature for activating Er3+ ions was found to be between 400 and 450°C. The emission intensity of α-Bi2O3:Er deposited with H2O was seven times higher than that deposited with O-2.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Optics
Gota Ito, Hiromi Kimura, Daiki Shiratori, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: Different Ce-doped concentrations of ZnCl2-based glasses were studied for their optical and scintillation properties, with the 0.05% Ce-doped glass showing the highest light yield. The origin of two broad emission peaks in the luminescence spectra was attributed to Ce3+, and this is the first report of light yield in ZnCl2-based glasses.
Article
Chemistry, Inorganic & Nuclear
Dalanda Hamdi, Lobna Mansouri, Varsha Srivastava, Mika Sillanpaa, Latifa Bousselmi
Summary: The addition of Eu to TiO2 photocatalysts showed the best enhancement in photoactivity performance for the removal of AB dye compared to Ce-TiO2 and pure TiO2 films. The optimal concentration for better electron/hole separation was found to be 1 wt% Ce or 0.1 wt% Eu doping in TiO2. EIS measurements demonstrated that Ce-TiO2(1 wt%) and Eu-TiO2(0.1 wt%) photocatalysts had lower electron transfer resistance than pure TiO2, leading to more effective separation of electron/hole pairs during photodegradation reactions.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Sergei V. Egorov, Anatoly G. Eremeev, Vladislav V. Kholoptsev, Ivan V. Plotnikov, Kirill I. Rybakov, Andrei A. Sorokin, Elena Ye. Rostokina, Stanislav S. Balabanov
Summary: This study investigates the effects of dopant concentration and heating rate on the densification curves of ZnO samples. Results show that direct absorption of microwave radiation leads to a shift of the densification curves towards lower temperatures. Additionally, the analysis presents the impact of absorbed microwave power on the formation of grain-boundary phases that facilitate densification.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Shuzhen Cui, Faqiang Wang, Kanjun Sun, Xin Wang, Qinzheng Hu, Hui Peng, Guofu Ma, Ziqiang Lei
Summary: Doping Ce ions into NiMoO4 nanosheets enhances electronic conductivity and expands crystal tunnel structure, providing a large ion storage space and easy ion diffusion channels. Ce-doped NiMoO4 nanosheets show high performance at high power, making them an advanced electrode material for supercapacitors.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Holger Schwarz, Thomas Uhlig, Thomas Lindner, Thomas Lampke, Guntram Wagner, Thomas Seyller
Summary: The hardness of the CoCrFeNi high-entropy alloy (HEA) is systematically enhanced by the addition of tungsten carbide (WC). The increase in WC content in the fabricated thin films through magnetron sputtering results in an increase in hardness.
Article
Chemistry, Inorganic & Nuclear
Sebastian Scharf, Sebastian Notz, Rico Thomas, Michael Mehring, Christoph Tegenkamp, Petr Formanek, Rene Huebner, Heinrich Lang
Summary: Twin monomers form interpenetrating organic-inorganic hybrid materials through thermal polymerization. Carbonization and calcination produce porous MgO with high surface area, which shows excellent catalytic activity towards Meerwein-Ponndorf-Verley reductions. The twin polymerization of MgO with CuO or AgO leads to the formation of nanoparticle-decorated materials, which exhibit high catalytic reactivity towards the reduction of methylene blue.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Thomas Lindner, Bianca Preuss, Martin Loebel, Lisa-Marie Rymer, Maximilian Grimm, Holger Schwarz, Thomas Seyller, Thomas Lampke
Summary: Compositional alterations to high-entropy alloys (HEAs) can be used to further develop their properties for coating technologies and surface-protection applications. In this study, minor quantities of the non-metallic alloying constituents BSiC were added to the CrFeNi base system. The wear resistance of the alloy was significantly increased compared to the BSiC-free variant. The evaluation of the process-structure-property relationships confirmed the great potential of developing load-adapted HEA systems using non-metallic alloy constituents in surface engineering.
Article
Chemistry, Multidisciplinary
Holger Schwarz, Jonathan Apell, Ha Kit Wong, Peter Henning, Robert Wonneberger, Niels Roesch, Thomas Uhlig, Felix Ospald, Guntram Wagner, Andreas Undisz, Thomas Seyller
Summary: High-entropy alloys (HEAs) have garnered attention in material science due to their limitless composition possibilities. Recently, their use as tunable electrocatalysts has become a focus. However, there is limited research on fundamental properties of HEA surfaces, such as atomic and electronic structure, surface segregation and diffusion, and adsorption. This lack of research is due to the limited availability of single-crystalline samples.
ADVANCED MATERIALS
(2023)
Article
Spectroscopy
Sae Hee Ryu, Garett Reichenbach, Chris M. Jozwiak, Aaron Bostwick, Peter Richter, Thomas Seyller, Eli Rotenberg
Summary: Angle-Resolved Photoemission Spectroscopy (ARPES) is a technique used to study electronic excitations in conductive, crystalline matter. In this paper, the authors report progress towards magnetoARPES, a variant of ARPES that can be conducted in a magnetic field. They demonstrate the viability of this technique by presenting experimental and simulated data for graphene.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Materials Science, Multidisciplinary
Sebastian Scharf, Sebastian Notz, Mohamed Abdeldayem, Rico Thomas, Marcus Weber, Michael Mehring, Mathias Franz, Dirk Rittrich, Stefan E. Schulz, Heinrich Lang
Summary: This article discusses the synthesis and characterization of complexes [M(O2CCH2(OCH2CH2)(n)OMe)(m)]. Thermogravimetric (TG) studies reveal the decomposition behavior and formation of metal oxides. TG-MS-coupled studies provide insights into the decomposition mechanism. The successful synthesis of mixed metal oxides and thin film formation is also demonstrated.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Bianca Preuss, Thomas Lindner, Thomas Uhlig, Jorge Eduardo Tapia Cabrera, Holger Schwarz, Guntram Wagner, Thomas Seyller, Thomas Lampke
Summary: The microstructural evolution of high-entropy alloys during different preparation processes was investigated. It was found that the lamellar structure in laser metal deposition (LMD) coatings showed vertical solidification due to the remelting of powder, while the lamellar orientation in spark plasma sintering (SPS) materials was determined by the microstructure of the powder. The LMD coatings exhibited improved functional properties compared to the SPS materials. The influence of lamellar orientation on tribological properties was reduced after heat treatment, and the influence of lamellar size on material properties could be derived.
Article
Materials Science, Multidisciplinary
Kristupas Kazimieras Tikuisis, Adam Dubroka, Klara Uhlirova, Florian Speck, Thomas Seyller, Maria Losurdo, Milan Orlita, Martin Veis
Summary: We studied the optical properties of quasi-freestanding epitaxial monolayer graphene grown on the Si face of 6H-SiC (0001) in a broad spectral range from midinfrared to ultraviolet. The sample was intercalated with hydrogen after growth to eliminate dangling bonds between the substrate and graphene layer. The dielectric function of graphene was characterized by spectroscopic ellipsometry, and the sample was found to be very similar to exfoliated graphene in terms of optical properties. Spectral dependence of the complex dielectric function of the quasi-freestanding graphene was determined in a broad spectral range.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Physical
Sebastian Scharf, Sebastian Notz, Heinrich Lang
Summary: Ethylene glycol metal carboxylates are suitable as precursors for low-temperature formation of M and MxOy nanoparticles, which are applicable in catalytic heterogeneous reactions such as hydrogenations, hydrometalations, or C,C cross-couplings. [Ru(CO)2(PPh3)2(O2CR)2] complexes are excellent homogeneous catalysts with high regioselectivities for the synthesis of β-oxo-propyl and enol esters. Additionally, applications beyond catalysis are presented.
Article
Chemistry, Physical
Mellie Lemon, Ping Lu, Fabian Goehler, Thomas Seyller, David C. Johnson
Summary: In this study, a series of Fe-x(FeyV1-ySe2) compounds were synthesized using designed sequences of atomically thin elemental layers. Low-temperature annealing was found to expand the solid solution range of the alloys. Multiple experimental techniques were required to accurately determine the location and extent of Fe incorporation in each sample.
CHEMISTRY OF MATERIALS
(2023)
Review
Chemistry, Inorganic & Nuclear
Sebastian Scharf, Sebastian Notz, Heinrich Lang
Summary: This article introduces the principle and application of twin polymerization (TP) method for the preparation of inorganic-organic hybrid materials. TP method can form interpenetrating phase (nano)domains in a single step, and can be used to prepare hierarchical materials and encapsulate nanoparticles. TP also has a wide range of applications, including coatings, textile functionalization, and battery materials.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Yangbiao Liu, Sebastian Notz, Heinrich Lang, Michael Zharnikov
Summary: This study investigated the molecular organization and charge transport properties of custom-designed self-assembled monolayers (SAMs) on Au(111) with pyrene-substituted alkanethiolates. The SAMs exhibited homogeneous anchoring, dense molecular packing, and exceptional orientational order. The analysis of charge transport data revealed that the pyrene groups had higher conductance compared to the alkyl chain of the same length, and the S heteroatoms had a negative effect on the conductance of the alkyl linker.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Philip Schaedlich, Chitran Ghosal, Monja Stettner, Bharti Matta, Susanne Wolff, Franziska Schoelzel, Peter Richter, Mark Hutter, Anja Haags, Sabine Wenzel, Zamin Mamiyev, Julian Koch, Serguei Soubatch, Philipp Rosenzweig, Craig Polley, Frank Stefan Tautz, Christian Kumpf, Kathrin Kuester, Ulrich Starke, Thomas Seyller, Francois C. Bocquet, Christoph Tegenkamp
Summary: The synthesis of graphene-based quantum materials by intercalation is a promising method, but it depends on the structural details of the new heterostructure. The structure of a Pb monolayer intercalated into graphene on the SiC(0001) interface was studied using various techniques. It was found that a flat Pb monolayer forms on the SiC surface, with a van der Waals heterostructure and a quasi ten-fold periodicity due to grain boundary formation. The densely-packed Pb layer minimizes the doping influence by the SiC substrate, leading to charge-neutral monolayer graphene. A long-ranged (3x3√3×√3) reconstruction on the graphene lattice was observed, indicating nesting conditions.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Ahmed Khalladi, Eduard Kovalski, Mohammad A. Abdulmalic, Tobias Rueffer, Qing Yuan, H. Naili, Marcus Korb, Heinrich Lang
Summary: In this study, dinuclear and trinuclear lanthanide complexes bridged by ferrocenylcarboxylate were synthesized and characterized. The complexes exhibited unique structures and coordination modes, and their properties were investigated using various techniques and calculations.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Susanne Wolff, Niclas Tilgner, Florian Speck, Philip Schadlich, Fabian Goehler, Thomas Seyller
Summary: The intercalation of sulfur on the carbon-rich buffer layer on silicon carbide is investigated. Successful intercalation is confirmed by X-ray photoelectron spectroscopy and low-energy electron diffraction. Angle-resolved photoelectron spectroscopy reveals p-type doping in the intercalated samples. Partial intercalation is observed in some cases with non-intercalated sulfur remaining on top of the buffer layer. Further annealing leads to the migration of the non-intercalated sulfur under the buffer layer.
ADVANCED MATERIALS INTERFACES
(2023)
