Article
Chemistry, Physical
Chuanjun Zhou, Peiyao Pan, Xiao Wei, Zidong Lin, Cheng Chen, Xi Kang, Manzhou Zhu
Summary: This study presents the horizontal expansion of rod-shaped multi-icosahedral nanoclusters and successfully synthesizes a nanocluster with an Au13Ag12 core and six Au-1(DPPM)(1)(S-Adm)(1) peripheral wings. The structural comparison reveals the unique arrangement of Au-1(DPPM)(1)(S-Adm)(1) motif structures on the surface of this nanocluster.
NANOSCALE HORIZONS
(2022)
Article
Chemistry, Physical
A. Angeles-Pascual
Summary: The study conducted atomic and structural analysis of PtNPs heterogeneous catalysts using Cs-STEM technique, providing subangstrom resolution images to observe characteristics of PtNPs and defects in atomic columns. By studying high-resolution HAADF images, as much information as possible can be extracted to address the challenges and opportunities in nanocatalysis.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Shaodong Zhou, Kelei Xi, Songlin Zhuang, Qingqing Cheng
Summary: This study introduces a terahertz metalens with spherical aberration correction that utilizes dynamic phase for polarization multiplexed imaging. The metalens shows high imaging efficiencies and extinction ratios, exceeding 50% and 10:1 respectively. It offers a new approach for achieving multifunctional beam steering, tomographic imaging, and chiroptical detection.
Article
Chemistry, Physical
Raj Kumar Ramamoorthy, Katerina Soulantica, Iker Del Rosal, Raul Arenal, Philippe Decorse, Jean-Yves Piquemal, Bruno Chaudret, Romuald Poteau, Guillaume Viau
Summary: This study reveals that the crystalline structure and shape of ruthenium nanoparticles can be controlled under different reaction conditions. An excess of long-chain amine in the solution leads to the formation of hexagonal close-packed structure, while an excess of long-chain carboxylic acid induces the formation of ultrathin platelets and icosahedra. It is found that carbon monoxide generated in the reaction plays a pivotal role in stabilizing the Ru icosahedra.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Ceramics
Xiaoyuan Ye, Congying Xiang, Hongbo Nie, Huasheng Lei, Yong Du, Wandong Xing, Jian Luo, Zhiyang Yu
Summary: Aberration-corrected scanning transmission electron microscopy was used to study the atomic-level segregation mechanism in V-doped WC-Co composites. It was found that the segregation behavior largely depends on the orientation of low-index planes, particularly the basal and prismatic facets in WC-Co. V solute atoms show weak segregation at the WC prismatic plane-terminated interfaces, mainly occurring within a monolayer. In contrast, segregation at the basal facets of WC grains distributes within a bilayer with a higher concentration.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Kalani Moore, Ursel Bangert, Michele Conroy
Summary: Advancements in electron microscopy have allowed for the exploration of the complex nature of ferroelectric topological defects, observing changes in polarization, chemical composition, charge density, and strain. Current achievements include mapping the 3D nature of ferroelectric polar skyrmions and in situ biasing. The research focuses on understanding the fundamental physics and dynamics of domain wall and polar vortex formation in ferroelectrics.
Review
Materials Science, Multidisciplinary
Knut W. Urban, Juri Barthel, Lothar Houben, Chun-Lin Jia, Lei Jin, Markus Lentzen, Shao-Bo Mi, Andreas Thust, Karsten Tillmann
Summary: Transmission electron microscopy is a crucial tool for studying the structure and properties of materials at atomic resolution. It allows for high spatial resolution and enables the correlation between microstructure and macroscopic properties. With the development of aberration-corrected electron optics, it became possible to perform picometer-scale measurements and chemical analyses. This paper aims to introduce this new type of electron microscopy, discuss its implications, applications, and limitations in materials science, and provide access to relevant literature.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Natalie J. Waleska-Wellnhofer, Eva Marie Freiberger, Felix Hemauer, Valentin Schwaab, Christian Papp
Summary: In this work, nano-strong metal-support interaction is observed for bimetallic FePt nanoclusters on graphene/Rh(111) substrate. The encapsulation of Pt with an Fe oxide layer and the formation of an FePt alloy were found at elevated temperature.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Dancui Li, Yangyang Li
Summary: We design a focusing metalens working at a wavelength of 0.705μm by patterning single layer metasurface on one side of a substrate. With the addition of a correcting phase, the metalens achieves diffraction-limited focusing along the focal plane with a field of view of 90 degrees and excellent imaging performance. The possibilities of our designed metalens offer unprecedented opportunities for microscopes, lithography machines, sensors, and displays.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Nestor J. Zaluzec
Summary: Aberration correction in the analytical transmission electron microscope has been closely associated with advancements in high-resolution imaging. This paper demonstrates that by combining this technology with new system designs that optimize electron optics and x-ray detection, performance has improved by more than tenfold over the past 25 years.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Multidisciplinary Sciences
Christopher S. Allen, Fouad Ghamouss, Ouassim Boujibar, Peter J. F. Harris
Summary: Non-graphitizing carbons (NGCs) are a class of solid carbons that cannot be converted into graphite even with high-temperature heat treatment. Despite decades of research, there is still no consensus on their atomic structure and resistance to graphitization. In this study, aberration-corrected transmission electron microscopy was used to investigate an activated carbon, revealing the presence of pentagonal and heptagonal carbon rings. These findings support a model of NGC structure composed of curved fragments with non-hexagonal rings dispersed randomly throughout hexagonal networks.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Chemistry, Physical
Yongsheng Yu, Lin He, Junjie Xu, Jiaming Li, Sida Jiang, Guanghui Han, Baojiang Jiang, Wenjuan Lei, Weiwei Yang, Yanglong Hou
Summary: This study presents a simple approach to synthesize monodisperse ordered L1(0)-FePt NPs with average size 10.7 nm without further annealing or doping the third metal atoms. The use of hexadecyltrimethylammonium chloride (CTAC) is key in inducing the thermodynamic growth of Fe and Pt atoms into the ordered intermetallic structure. The synthesized 10.7 nm L1(0)-FePt NPs exhibit a coercivity of 3.15 kOe and saturation magnetization of 45 emu/g at room temperature, showing the potential for solution phase synthesis of ordered Pt-based intermetallic NPs.
Article
Chemistry, Multidisciplinary
Irene Calderon, Ramon A. Alvarez-Puebla, Nicolas Pazos-Perez
Summary: This method achieves particles composed of a segregated alloy of silver coated with gold by controlled Ostwald ripening of small gold nanoparticles on the surfaces of larger silver particles. The prepared segregated nanoalloyed colloids combine the advantages of both gold and silver without their drawbacks.
Article
Acoustics
Moein Mozaffarzadeh, Dirk J. Eric Verschuur, Martin D. Verweij, Nico de Jong, Guillaume Renaud
Summary: In this study, a technique for correcting aberration caused by the skull and reconstructing a transcranial B-mode image was proposed and implemented on a GPU. The results showed that the proposed technique achieved high-quality image reconstruction with minimal degradation in lateral resolution.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Chemistry, Physical
Vincent Mauricio Kadiri, Jan-Philipp Guenther, Sai Nikhilesh Kottapalli, Rahul Goyal, Florian Peter, Mariana Alarcon-Correa, Kwanghyo Son, Hannah-Noa Barad, Michael Boersch, Peer Fischer
Summary: The study introduces externally controlled microswimmers with FePt coatings that are biocompatible and can be tailored for propulsion in low Reynolds number environments. The hard magnetic properties of L1(0) FePt are beneficial for helical micropropellers propelled by rotating magnetic fields. Additionally, the FePt coatings are catalytically active and can be used to create light-actuated and magnetically guided Janus microswimmers.
EUROPEAN PHYSICAL JOURNAL E
(2021)
Article
Nanoscience & Nanotechnology
Lukas Wind, Masiar Sistani, Zehao Song, Xavier Maeder, Darius Pohl, Johann Michler, Bernd Rellinghaus, Walter M. Weber, Alois Lugstein
Summary: A wafer-scale platform technology for fabricating monolithic Al-Ge-Al nanostructures is presented, with high purity and crystal quality of the Al segments confirmed by transmission electron microscopy. The fabricated structures show promise for the development of a variety of emerging Ge-based devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Luigi Angelo Castriotta, Fabio Matteocci, Luigi Vesce, Lucio Cina, Antonio Agresti, Sara Pescetelli, Alessandro Ronconi, Markus Loeffler, Minas M. Stylianakis, Francesco Di Giacomo, Paolo Mariani, Maurizio Stefanelli, Emily Mae Speller, Antonio Alfano, Barbara Paci, Amanda Generosi, Fabio Di Fonzo, Annamaria Petrozza, Bernd Rellinghaus, Emmanuel Kymakis, Aldo Di Carlo
Summary: This study successfully demonstrated the use of double-cation perovskite processed in ambient air for the first time, by employing potassium-doped graphene oxide as an interlayer. The efficiency and stability of MA-free-based perovskite deposition in air have been improved by using GO-K and IRA, facilitating industrial-scale production of perovskite solar cells.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
David Becker-Koch, Miguel Albaladejo-Siguan, Yvonne J. Hofstetter, Olga Solomeshch, Darius Pohl, Bernd Rellinghaus, Nir Tessler, Yana Vaynzof
Summary: Efficiency of PbS quantum dot solar cells has increased, with potential for industrial applications. The use of organic layers like PTAA can improve efficiency while avoiding stability issues associated with EDT and MoO3 layers.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Luis Antonio Panes-Ruiz, Leif Riemenschneider, Mohamad Moner Al Chawa, Markus Loeffler, Bernd Rellinghaus, Ronald Tetzlaff, Viktor Bezugly, Bergoi Ibarlucea, Gianaurelio Cuniberti
Summary: A 64-channel sensor array based on semiconducting single-walled carbon nanotubes demonstrates selective detection of hydrogen sulfide at breath concentration levels, with a sensitivity of 0.122%/ppb and a LOD of 3 ppb. The sensors show increased stability and higher response levels compared to some commercially available electrochemical sensors, with high selectivity to H2S. Mathematical models of sensors' electrical characteristics and sensing responses are developed to enhance the platform's differentiation capabilities in breath analysis applications.
Article
Nanoscience & Nanotechnology
Zehao Song, Masiar Sistani, Lukas Wind, Darius Pohl, Bernd Rellinghaus, Walter M. Weber, Alois Lugstein
Summary: In order to establish high-bandwidth chip-to-chip interconnects in optoelectronic integrated circuits, high-performance photon emitters and signal receiving components are required. Despite fast device concepts and high carrier mobility materials, integrating photodetectors in highly scaled IC technologies remains challenging.
Article
Engineering, Electrical & Electronic
Tom Mauersberger, Jens Trommer, Saurabh Sharma, Martin Knaut, Darius Pohl, Bernd Rellinghaus, Thomas Mikolajick, Andre Heinzig
Summary: The study focuses on one-step etching of HZO and TiN layers, achieving slow and controllable etch rates by adjusting gas ratio and plasma power, as well as high selectivity and good anisotropic etching.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Applied
Benny Boehm, Lorenzo Fallarino, Darius Pohl, Bernd Rellinghaus, Olav Hellwig
Summary: In this work, a concept is presented to stabilize laterally homogeneous vertical AF domain walls by locally varying the perpendicular magnetic anisotropy in Co/Pt-based SAFs. This approach enables the stabilization of the vertical AF domain wall without external magnetic field and allows for deterministic selection of different remanent states within a broad external magnetic field range. Additionally, the concept can be extended to stabilize two coexisting vertical AF domain walls, resulting in a system with a total of six selectable and reprogrammable remanent states.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Ruslan Salikhov, Fabian Samad, Benny Boehm, Sebastian Schneider, Darius Pohl, Bernd Rellinghaus, Aladin Ullrich, Manfred Albrecht, Juergen Lindner, Nikolai S. Kiselev, Olav Hellwig
Summary: Controlled switching of domain-wall magnetization in multilayers with perpendicular magnetic anisotropy is achieved by applying an external magnetic field. The reversal of domain-wall polarization is attributed to the emergence and collapse of horizontal Bloch lines within domain walls at specific strengths of the external magnetic field. These findings have implications for DW-based magnonics and bubble-skyrmion applications.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Yangkun He, Peter Adler, Sebastian Schneider, Ivan Soldatov, Qingge Mu, Horst Borrmann, Walter Schnelle, Rudolf Schaefer, Bernd Rellinghaus, Gerhard H. Fecher, Claudia Felser
Summary: The authors report on the intrinsic highly-anisotropic magnetic properties of Co and Si co-doped single crystals, which exhibit performance superior to rare-earth magnets without containing rare earth elements. By controlling the doping concentration, the material achieved maximum magnetocrystalline anisotropy and Curie temperature in experiments, showing great potential for the development of permanent magnets.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Raphael Boeckle, Masiar Sistani, Boris Lipovec, Darius Pohl, Bernd Rellinghaus, Alois Lugstein, Walter M. Weber
Summary: Conventional FET concepts are limited by steep doping requirements, while RFETs allow dynamic device operation. Ge is seen as a promising material for reducing power consumption, but its use has been restricted to simulations and basic demonstrations.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
S. Drescher, S. Seils, D. Pohl, B. Rellinghaus, A. Kauffmann, M. Heilmaier, J. Freudenberger
Summary: The formation of homogeneous solid solutions at high temperatures, as well as the decomposition into two chemically different solid solutions during annealing, have been studied in AuCuNiPdPt and AuNiPdPt alloys. Different annealing treatments result in different microstructures, allowing for the evaluation of the effect of chemical compositions and their size on the mechanical properties. Softening of the alloys is observed, along with a decrease in hardness with increasing concentration modulation amplitude and decomposed solid solution size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Darius Pohl, Yejin Lee, Dominik Kriegner, Sebastian Beckert, Sebastian Schneider, Bernd Rellinghaus, Andy Thomas
Summary: We present advancements in in-situ magneto-transport measurements using a transmission electron microscope. This approach allows for simultaneous magnetic imaging, high-resolution structural analysis, and chemical characterization of the same sample. Our proof-of-principle measurements on nickel thin films, supported by micromagnetic simulations, demonstrate the importance of detailed knowledge of the sample's structure and composition for accurate interpretation of the magneto-transport data. This in-situ approach is expected to enhance our understanding of the Hall effect in more complex magnetic textures.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Yangkun He, Toni Helm, Ivan Soldatov, Sebastian Schneider, Darius Pohl, Abhay Kant Srivastava, Ankit Kumar Sharma, Johannes Kroder, Walter Schnelle, Rudolf Schaefer, Bernd Rellinghaus, Gerhard H. Fecher, Stuart S. P. Parkin, Claudia Felser
Summary: The domain structure of thin Nd2Fe14B lamellae is studied in this paper. Magnetic bubbles with a minimum diameter of 74 nm were observed at room temperature, approaching the range of magnetic skyrmions. Both the stripe domain width and the bubble size are dependent on the thickness. Moreover, a kind of bubble combining bubbles with opposite helicity was observed below the spin-reorientation transition temperature. The study reveals Nd2Fe14B to be a good candidate for high-density magnetic bubble-based memory.
Article
Materials Science, Multidisciplinary
Richard Schlitz, Sergey Granovsky, Darius Pohl, Andy Thomas, Bernd Rellinghaus, Sebastian T. B. Goennenwein
Summary: The study investigates the magnetoresistive response of yttrium iron garnet/platinum heterostructures at different temperatures, finding that the amplitude of the spin Hall magnetoresistance decreases with increasing temperature and disappears around 500K, potentially due to the formation of a parasitic interface layer. The nonlocal magnon-mediated magnetoresistance exhibits a power law scaling T-alpha, gradually decreasing to a vanishing point as the temperature rises.
Article
Chemistry, Inorganic & Nuclear
Friedrich Schwotzer, Irena Senkovska, Volodymyr Bon, Stefanie Lochmann, Jack D. Evans, Darius Pohl, Bernd Rellinghaus, Stefan Kaskel
Summary: The study focuses on selecting suitable solvents for delaminating layered MOF nanosheets, and finds that ketone solvents (such as acetone and butanone) are effective in separating DUT-134(Cu) and forming stable suspensions.
INORGANIC CHEMISTRY FRONTIERS
(2021)
