Andreas Klein
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View article: Evaluating the Osteoclastogenic Potential of Peripheral Blood Mononuclear Cells in Children with Chronic Nonbacterial Osteomyelitis
Evaluating the Osteoclastogenic Potential of Peripheral Blood Mononuclear Cells in Children with Chronic Nonbacterial Osteomyelitis Open
Chronic nonbacterial osteomyelitis (CNO) is an autoinflammatory bone disease in which osteoclastogenesis may play a critical role. Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) has been shown to inhibit osteoclastogenesis derived fr…
View article: Direct determination of the charge transition level of dopants in oxides by x-ray photoelectron spectroscopy
Direct determination of the charge transition level of dopants in oxides by x-ray photoelectron spectroscopy Open
Charge transition levels of dopants directly influence material properties, but experimental numbers are difficult to obtain. It will be demonstrated how x-ray photoelectron spectroscopy can be applied to directly determine charge transiti…
View article: Controlling the Oxygen Content in Sn‐Doped In <sub>2</sub> O <sub>3</sub> Thin Films by Partially Reactive Co‐Sputtering
Controlling the Oxygen Content in Sn‐Doped In <sub>2</sub> O <sub>3</sub> Thin Films by Partially Reactive Co‐Sputtering Open
It is shown that partially reactive co‐sputtering employing ceramic In 2 O 3 and metallic Sn targets is a viable tool to control the dopant and carrier concentration n in In 2 O 3 thin films over a wide range, reaching carrier concentratio…
View article: The physics of defect chemistry and the chemistry of defect physics
The physics of defect chemistry and the chemistry of defect physics Open
The energy of reduction is connected to the formation of oxygen vacancies by the standard chemical potential of oxygen.
View article: Fermi level limitation in Na1/2Bi1/2TiO3–BaTiO3 piezoceramics by electrochemical reduction of Bi
Fermi level limitation in Na1/2Bi1/2TiO3–BaTiO3 piezoceramics by electrochemical reduction of Bi Open
The (electro)chemical stability of undoped and Zn-doped 0.94Na1/2Bi1/2TiO3–0.06BaTiO3 lead-free piezoceramics (NBT–6BT) was studied. For this purpose, the Fermi level at the interface between NBT–6BT and Sn-doped In2O3 (ITO) electrode is v…
View article: A Single Model for the Thermodynamics and Kinetics of Metal Exsolution from Perovskite Oxides
A Single Model for the Thermodynamics and Kinetics of Metal Exsolution from Perovskite Oxides Open
Exsolution has emerged as an outstanding route for producing oxide-supported metal nanoparticles. For ABO3-perovskite oxides, various late transition-metal cations can be substituted into the lattice under oxidizing conditions and exsolved…
View article: A General Model-Implied Simulation-Based Power Estimation Method for Correctly and Misspecfied Models: Applications to Nonlinear and Linear Structural Equation Models
A General Model-Implied Simulation-Based Power Estimation Method for Correctly and Misspecfied Models: Applications to Nonlinear and Linear Structural Equation Models Open
Closed-form power estimation is only available for limited classes of models, requiring correct model specification for most applications. Simulation is used in other scenarios, but a general framework in computing required sample sizes fo…
View article: A phase 1-2 trial of DA-EPOCH-R plus ixazomib for MYC-aberrant lymphoid malignancies: the DACIPHOR regimen
A phase 1-2 trial of DA-EPOCH-R plus ixazomib for MYC-aberrant lymphoid malignancies: the DACIPHOR regimen Open
MYC-aberrant non-Hodgkin lymphoma (NHL) is associated with poor outcomes with conventional chemotherapy. Ixazomib is an orally bioavailable proteasome inhibitor that targets drivers of MYC expression and has demonstrated preclinical activi…
View article: Unravelling the doping mechanism and origin of carrier limitation in Ti-doped In2O3 films
Unravelling the doping mechanism and origin of carrier limitation in Ti-doped In2O3 films Open
Ti-doped In2O3 thin films with varying Ti contents are prepared by partial reactive co-sputtering using ceramic In2O3 and metallic Ti targets and characterized by in situ x-ray photoelectron spectroscopy, electrical conductivity, and Hall-…
View article: Probing Cation Displacements in Antiferroelectrics: A Joint NMR and TEM Approach
Probing Cation Displacements in Antiferroelectrics: A Joint NMR and TEM Approach Open
High-resolution scanning transmission electron microscopy (STEM) enjoys great advantages for atomic-resolution visualization of the atomic structure, while failing to disclose structural information along the atomic columns. On the other h…
View article: The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics
The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics Open
Chemical substitution, which can be iso- or heterovalent, is the primary strategy to tailor material properties. There are various ways how a material can react to substitution. Isovalent substitution changes the density of states while he…
View article: Electrostatic Boundary Conditions and (Electro)chemical Interface Stability
Electrostatic Boundary Conditions and (Electro)chemical Interface Stability Open
Interface stability is a key factor for stable operation of electronic and electrochemical devices. This contribution introduces an approach for the operando analysis of interfaces using photoelectron spectroscopy employing a solid oxide e…
View article: High open-circuit voltage in single-crystalline <i>n</i>-type SnS/MoO3 photovoltaics
High open-circuit voltage in single-crystalline <i>n</i>-type SnS/MoO3 photovoltaics Open
It has been recently reported that n-type single crystalline SnS exhibits a large band bending (∼1 eV) at the interface with MoO3, which is a large work function material. In this study, we applied this interface to solar cells for the fir…
View article: Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization
Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization Open
Herein, a surface cleaning procedure involving vacuum annealing under oxygen was applied for cleaning the zinc oxide nanorod (ZNR) scaffold film's surface before nickel oxide (NiO) deposition for heterostructure formation. The scaffold pro…
View article: Structure and electronic properties of amorphous strontium titanate
Structure and electronic properties of amorphous strontium titanate Open
Understanding the short-range structure of an amorphous material is the first step in predicting its macroscopic properties. Amorphous strontium titanate (a-STO) presents a unique challenge due to contradictory experimental findings regard…
View article: Electronic and Chemical Properties of Nickel Oxide Thin Films and the Intrinsic Defects Compensation Mechanism
Electronic and Chemical Properties of Nickel Oxide Thin Films and the Intrinsic Defects Compensation Mechanism Open
Although largely studied, contradictory results on nickel oxide (NiO) properties can be found in the literature. We herein propose a comprehensive study that aims at leveling contradictions related to NiO materials with a focus on its cond…
View article: Correction: Weingart et al. Expanded Polycarbonate (EPC)—A New Generation of High-Temperature Engineering Bead Foams. Polymers 2020, 12, 2314
Correction: Weingart et al. Expanded Polycarbonate (EPC)—A New Generation of High-Temperature Engineering Bead Foams. Polymers 2020, 12, 2314 Open
In the original publication [...]
View article: Origin of Surface Reduction upon Water Adsorption on Oriented NiO Thin Films and Its Relation to Electrochemical Activity
Origin of Surface Reduction upon Water Adsorption on Oriented NiO Thin Films and Its Relation to Electrochemical Activity Open
The interaction of water with oriented NiO films is studied by using a combination of photoelectron spectroscopy with in situ sample preparation and electrochemical measurements in the stability window of water. In contrast to NiO(100), ro…
View article: Reversible Barrier Switching of ZnO/RuO2 Schottky Diodes
Reversible Barrier Switching of ZnO/RuO2 Schottky Diodes Open
The current-voltage characteristics of ZnO/RuO2 Schottky diodes prepared by magnetron sputtering are shown to exhibit a reversible hysteresis behavior, which corresponds to a variation of the Schottky barrier height between 0.9 and 1.3 eV …
View article: Influence of Defects on the Schottky Barrier Height at BaTiO<sub>3</sub>/RuO<sub>2</sub> Interfaces
Influence of Defects on the Schottky Barrier Height at BaTiO<sub>3</sub>/RuO<sub>2</sub> Interfaces Open
The Schottky barrier formation between polycrystalline acceptor‐doped BaTiO 3 and high work function RuO 2 is studied using photoelectron spectroscopy. Schottky barrier heights for electrons of ≈1.4 eV are determined, independent of doping…
View article: Electroceramics XVII - The 2020 virtual conference experience at TU Darmstadt
Electroceramics XVII - The 2020 virtual conference experience at TU Darmstadt Open
The Electroceramics XVII conference, held August 24–28, 2020, was the first fully online conference in the
\nbiannual Electroceramics conference series. This communication provides a summary of the experiences gathered
\nduring the organiz…
View article: Fermi Level Engineering for Large Permittivity in BaTiO3-Based Multilayers
Fermi Level Engineering for Large Permittivity in BaTiO3-Based Multilayers Open
Multilayered doped BaTiO3 thin films have been fabricated by physical vapor deposition (PVD) on low-cost polycrystalline substrates with the aim to improve dielectric properties by controlling point charge defects at the interfaces. We sho…
View article: Transparent Conducting Oxides for Photovoltaics: Manipulation of Fermi Level, Work Function and Energy Band Alignment
Transparent Conducting Oxides for Photovoltaics: Manipulation of Fermi Level, Work Function and Energy Band Alignment Open
Doping limits, band gaps, work functions and energy band alignments of undoped and donor-doped transparent conducting oxides Zn₀, In₂O₃, and SnO₂ as accessed by X-ray and ultraviolet photoelectron spectroscopy (XPS/UPS) are summarized and …
View article: Electronic properties of In₂O₃ surfaces
Electronic properties of In₂O₃ surfaces Open
Surfaces of reactively evaporated In₂O₃ films were investigated in situ by synchrotron-excited photoemission. Work function, valence band maximum, and electronic states in the band gap were determined as a function of oxygen pressure. Surf…