Article
Optics
Rui Cao, Jingjing Zhao, Lei Li, Lin Du, Yide Zhang, Yilin Luo, Laiming Jiang, Samuel Davis, Qifa Zhou, Adam de la Zerda, Lihong Wang
Summary: Optical-resolution photoacoustic microscopy can visualize wavelength-dependent optical absorption at the cellular level. However, it has a limited depth of field. To overcome this limitation, needle-shaped beam photoacoustic microscopy is proposed. This approach extends the depth of field and provides new perspectives for slide-free intraoperative pathological imaging and in vivo organ-level imaging.
Article
Physics, Applied
Yongjin Sung
Summary: SPOT utilizes a microlens array to capture projection images of 3D specimens, demonstrating snapshot 3D fluorescence and absorption imaging. By using specific illumination and lenslet combinations, a 3D map of absorption coefficient can be obtained with good transverse and axial resolutions.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Ryo Ishikawa, Riku Tanaka, Kazuaki Kawahara, Naoya Shibata, Yuichi Ikuhara
Summary: The text discusses the importance of metal oxide surfaces and the direct determination of 3D atomic structures using depth sectioning of atomic-resolution annular dark-field scanning transmission electron microscopy. By statistically analyzing column by column depth profiles, researchers achieved high depth resolution at the entrance surface, providing fertile ground for advancements in surface science.
Article
Physics, Applied
Victor Boureau, Michal Stano, Jean-Luc Rouviere, Jean-Christophe Toussaint, Olivier Fruchart, David Cooper
Summary: This study compares two TEM techniques for highly spatially resolved quantitative measurements of magnetic induction fields, showing that the pixelated STEM approach provides better sensitivity at the expense of spatial resolution. The results indicate that off-axis electron holography and pixelated differential phase contrast are effective methods for measuring magnetic induction in nanowires.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Biomedical
Han Gyu Kang, Hideaki Tashima, Fumihiko Nishikido, Go Akamatsu, Hidekazu Wakizaka, Makoto Higuchi, Taiga Yamaya
Summary: A mouse brain PET prototype was successfully developed with a staggered 3-layer DOI detector, achieving clear identification of brain structures with high contrast. The use of DOI detector improved resolution and reduced inter-crystal scatter, resulting in good imaging performance.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Chemistry, Physical
Huihui Wen, Hongye Zhang, Runlai Peng, Chao Liu, Shuman Liu, Fengqi Liu, Huimin Xie, Zhanwei Liu
Summary: In this study, a scanning transmission electron microscopy (STEM) moire depth sectioning method is proposed, which can accurately evaluate the 3D strain field at the nanoscale. Through optimizing the scanning parameters of electron probes at different depths, a large field of view STEM-MFs sequence is obtained, and the 3D STEM moire information is constructed. The developed method realizes multi-scale 3D strain field measurements and accurately measures the 3D strain field near the heterostructure interface and single dislocation.
Article
Chemistry, Multidisciplinary
Gerard M. Leteba, Yi-Chi Wang, Thomas J. A. Slater, Rongsheng Cai, Conor Byrne, Christopher P. Race, David R. G. Mitchell, Pieter B. J. Levecque, Neil P. Young, Stuart M. Holmes, Alex Walton, Angus Kirkland, Sarah J. Haigh, Candace Lang
Summary: This study reports a rapid synthesis strategy to produce alloyed PtNi nanoparticles with outstanding functionality for the oxygen reduction reaction. The modified atomic nanostructures outperform the original PtNi particles by more than two-fold in catalytic performance and demonstrate improved cycling durability. These modified PtNi nanoparticles also exhibit significantly higher specific activities and intrinsic area-specific activities for the ORR compared to commercially available Pt/C nanoparticle electrocatalysts.
Article
Multidisciplinary Sciences
Samuel Pinilla, Johannes E. Froch, Seyyed Reza Miri Rostami, Vladimir Katkovnik, Igor Shevkunov, Arka Majumdar, Karen Egiazarian
Summary: A HIL optics design methodology is used to overcome limitations in the design of miniature color cameras using flat meta-optics. The resulting camera achieves high-quality full-color imaging, outperforming a compound multi-lens optics of a mirrorless commercial camera.
Article
Chemistry, Multidisciplinary
Ha Rim Lee, Da Woon Kim, Alfi Rodiansyah, Boklae Cho, Joonwon Lim, Kyu Chang Park
Summary: The structural properties of CNT cold cathodes, such as aspect ratio and tip diameter, significantly influence electron beam properties, including beam size and brightness, ultimately determining the resolution of secondary electron images obtained by SEM systems equipped with CNT cold cathode modules. Investigating these correlations is crucial for understanding the contributions of edge-emitted electrons to the total field emission current and establishing a basic model for advanced electron devices.
Article
Optics
Teruyoshi Nobukawa, Momoko Maezawa, Yutaro Katano, Msahide Goto, Tetsuhiko Muroi, Kei Hagiwara, Norihiko Ishii
Summary: Incoherent digital holography (IDH) allows recording holograms using incoherent light, but the reconstructed images suffer from unnatural bokeh and ringing due to diffraction calculations based on coherent light. To address this issue, a transformation method is proposed to convert the bokeh into an incoherent form using a virtual incoherent imaging system, effectively solving the non-linearity problem in reconstruction distances.
Article
Chemistry, Multidisciplinary
Xiaohui Song, Xingyu Zhang, Qiang Chang, Xin Yao, Mufan Li, Ruopeng Zhang, Xiaotao Liu, Chengyu Song, Yun Xin Angel Ng, Edison Huixiang Ang, Zihao Ou
Summary: The rapid advancement of transmission electron microscopy has led to revolutions in various fields, revealing the 3D information of each atom in nanoparticles and capturing the atomic structural kinetics in metal nanoparticles after phase transformation. Quantitative measurements of physical and chemical properties have been made, but high dose rates are incompatible with other ultrathin morphologies, limiting atomic electron tomography primarily to quasi-spherical nanoparticles. This study demonstrates the 3D atomic structure of a complex core-shell nanowire and shows that a new superthin noble metal layer can mitigate electron beam damage on ultrathin nanowires.
Article
Optics
Xiupin Wu, Wanrong Gao, Zhiyuan Qiu, Jiayong Yan, Xiaoou Li
Summary: In this study, a time-frequency analysis method was proposed to compensate for depth-dependent dispersion in noninvasive imaging. The algorithm was validated through simulation and experimental results showed a significant improvement in image resolution.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
E. W. C. Terzoudis-Lumsden, T. C. Petersen, H. G. Brown, P. M. Pelz, C. Ophus, S. D. Findlay
Summary: This study proposes a parallax method for three-dimensional structure determination using four-dimensional scanning transmission electron microscopy (STEM) and a wealth of scattering data. The method synthesizes a virtual depth-sectioning reconstruction of the sample structure by determining the scattering matrix. The study explores the use of dark field signal to improve depth resolution and discusses the challenges and limitations of the parallax reconstruction.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Environmental Sciences
T. Gaubert-Bastide, S. Garambois, C. Bordes, C. Voisin, L. Oxarango, D. Brito, P. Roux
Summary: The study focuses on monitoring groundwater level changes using high-resolution geophysical methods and recovering seismic wave velocity changes through passive seismic interferometry. The experiment shows that seismic velocity variations are directly related to changes in water level and water saturation within the unsaturated zone, aiding in the understanding and modeling of water flow dynamics.
WATER RESOURCES RESEARCH
(2022)
Article
Optics
Xin Qian, Lingyu Ai, Xiao Shi, Yue Dong, Myungjin Cho
Summary: This paper proposes an integral imaging-based hologram recording method using a commercial plenoptic camera to increase the field of view for a conventional integral imaging system. A depth recovery method combined with camera's metadata parameters is also proposed to address the problem of depth non-uniform compression. Furthermore, a reflective Fourier-ptychography-based algorithm with an optimum overlap rate is introduced to acquire high-performance holograms. Compared to traditional integral imaging holography, this method produces higher resolution reconstruction results and achieves better depth recovery.
Article
Chemistry, Multidisciplinary
Jingfeng Li, Sadhu Kolekar, Mahdi Ghorbani-Asl, Tibor Lehnert, Johannes Biskupek, Ute Kaiser, Arkady Krasheninnikov, Matthias Batzill
Summary: The electronic properties of platinum dichalcogenides can be tuned by controlling the number of layers, with monolayer PtSe2 and PtTe2 exhibiting band gaps of 1.8 and 0.6 eV, respectively. Experimental data compared to DFT calculations show the sensitivity of the band gap to interlayer separation, indicating the potential for gap tuning using stress. Additionally, modest pressures can significantly reduce the gap in Pt dichalcogenides, making them suitable for pressure sensing applications.
Article
Chemistry, Physical
Luke T. Norman, Johannes Biskupek, Graham A. Rance, Craig T. Stoppiello, Ute Kaiser, Andrei N. Khlobystov
Summary: The synthesis of ultrathin rhenium disulfide nanoribbons within single-walled carbon nanotubes has been achieved through controlled reactions with confined rhenium atoms, resulting in tailored width, structure, and composition. This low-dimensional material is expected to retain the electronic properties of bulk ReS2 and shows promise for applications in nanoscale electronic devices.
Article
Chemistry, Physical
Tom Philipp, Gregor Neusser, Ebrahim Abouzari-Lotf, Shirin Shakouri, Franziska D. H. Wilke, Maximilian Fichtner, Mario Ruben, Manuel Mundszinger, Johannes Biskupek, Ute Kaiser, Philipp Scheitenberger, Mika Linden, Christine Kranz
Summary: In this study, FIB/SEM tomography combined with an optimized embedding procedure and osmium tetroxide staining was used to trace and visualize the self-conditioning step and degradation processes of CuDEPP composite electrodes. The results revealed the insertion of the electrolyte into the active material of the electrode and the formation of an interphase. Raman spectroscopy confirmed the degradation processes of the metalloporphyrin complex.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Zhongbo Li, Johannes Biskupek, Ute Kaiser, Harald Rose
Summary: This study evaluates the potential of integrated differential phase contrast (IDPC) imaging for thick samples. By varying the focus and using a multi-sector detector, the anisotropy of the contrast transfer function (CTF) can be eliminated, resulting in improved image contrast and resolution.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Ziyang Gan, Ioannis Paradisanos, Ana Estrada-Real, Julian Picker, Emad Najafidehaghani, Francis Davies, Christof Neumann, Cedric Robert, Peter Wiecha, Kenji Watanabe, Takashi Taniguchi, Xavier Marie, Johannes Biskupek, Manuel Mundszinger, Robert Leiter, Ute Kaiser, Arkady Krasheninnikov, Bernhard Urbaszek, Antony George, Andrey Turchanin
Summary: In this study, a one-pot chemical vapor deposition (CVD) method is used to successfully grow large-area Janus SeMoS monolayers. The growth mechanism is revealed through experimental and computational methods, and the synthesized monolayers are shown to possess high optical quality.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Florian Klein, Joachim Bansmann, Zenonas Jusys, Claudia Pfeifer, Philipp Scheitenberger, Manuel Mundszinger, Dorin Geiger, Johannes Biskupek, Ute Kaiser, R. Juergen Behm, Mika Linden, Margret Wohlfahrt-Mehrens, Peter Axmann
Summary: Li-rich layered oxides (LRLO) are high-energy cathode materials that can reduce costs and environmental impact. A treatment strategy involving water, acid, and thermal treatment was applied to improve cycling behavior, but high temperature treatment led to structural changes and electrochemical deactivation.
Article
Materials Science, Multidisciplinary
Zhongbo Li, Harald Rose, Jacob Madsen, Johannes Biskupek, Toma Susi, Ute Kaiser
Summary: We present a novel method to improve the computational efficiency of (S)TEM image simulation by diagonalizing the mixed envelope function (MEF) using matrix diagonalization. By incorporating the aperture function, only a small number of eigenvectors are needed to approximate the original matrix with high accuracy, resulting in significant reduction in computation time.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Physical
Cornelius Gauckler, Manuel Dillenz, Fabio Maroni, Lukas Fridolin Pfeiffer, Johannes Biskupek, Mohsen Sotoudeh, Qiang Fu, Ute Kaiser, Sonia Dsoke, Holger Euchner, Peter Axmann, Margret Wohlfahrt-Mehrens, Axel Gross, Mario Marinaro
Summary: This study proposes a combined experimental/theoretical approach to investigate the effect of magnesium doping on the performance of sodium-ion battery cathode materials. The results show that magnesium doping improves the stability of the high potential plateau and enhances the cycling life. The analysis also reveals the presence of multiple possible intermediate phases in the magnesium-doped material.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yupeng Zhao, Dandan Gao, Si Liu, Johannes Biskupek, Ute Kaiser, Rongji Liu, Carsten Streb
Summary: Efficient and stable oxygen evolution reaction (OER) catalysts based on noble-metal-free materials are crucial for energy conversion and storage. This study demonstrated the conversion of polyoxometalate (POM)-doped ZIF-67 into a stable oxygen evolution electrocatalyst through chemical etching, cation exchange, and thermal annealing steps. Characterization techniques confirmed the synthesis of POM-doped ZIF-67 derived carbon-supported metal oxides, which exhibited structural and compositional advantages leading to low overpotential (306 mV at j=10 mA center dot cm(-2)) and long-term stability under harsh OER conditions (1.0 M aqueous KOH).
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Dorian Beret, Ioannis Paradisanos, Hassan Lamsaadi, Ziyang Gan, Emad Najafidehaghani, Antony George, Tibor Lehnert, Johannes Biskupek, Ute Kaiser, Shivangi Shree, Ana Estrada-Real, Delphine Lagarde, Xavier Marie, Pierre Renucci, Kenji Watanabe, Takashi Taniguchi, Sebastien Weber, Vincent Paillard, Laurent Lombez, Jean-Marie Poumirol, Andrey Turchanin, Bernhard Urbaszek
Summary: Chemical vapor deposition (CVD) enables lateral edge epitaxy of transition metal dichalcogenide heterostructures. We investigated CVD grown MoSe2-WSe2 lateral heterostructures and found that the quality of the material and the nature of the lateral heterojunction are critical for carrier and exciton transport. Optical spectroscopy techniques such as photoluminescence (PL), reflectance contrast, and Raman spectroscopy revealed high-quality optical transitions similar to exfoliated monolayers. The extent of the covalently bonded MoSe2-WSe2 heterojunctions was measured to be 3 nm using scanning transmission electron microscopy (STEM). Tip-enhanced, sub-wavelength optical spectroscopy mapping demonstrated the high quality of the heterojunction and its role as an excitonic diode for unidirectional exciton transfer from WSe2 to MoSe2.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
William J. Cull, Stephen T. Skowron, Ruth Hayter, Craig T. Stoppiello, Graham A. Rance, Johannes Biskupek, Zakhar R. Kudrynskyi, Zakhar D. Kovalyuk, Christopher S. Allen, Thomas J. A. Slater, Ute Kaiser, Amalia Patane, Andrei N. Khlobystov
Summary: In this study, single-layer, ultrathin, subnanometer-wide indium selenides (InxSey) were synthesized using templated growth inside single-walled carbon nanotubes (SWCNTs). The phase of the encapsulated material was identified through experimental analysis and simulations, and the identities of the encapsulated species were confirmed using various analytical techniques. These materials have the potential for applications in nanoelectronic components.
Article
Chemistry, Physical
Lukas Fridolin Pfeiffer, Yueliang Li, Manuel Mundszinger, Jonas Geisler, Claudia Pfeifer, Daria Mikhailova, Ahmad Omar, Volodymyr Baran, Johannes Biskupek, Ute Kaiser, Philipp Adelhelm, Margret Wohlfahrt-Mehrens, Stefano Passerini, Peter Axmann
Summary: In this study, the aging effects of sodium cathode materials for sodium-ion batteries (SIBs) were investigated. The study identified the causes of increased polarization and loss of active material, and provided insights for the development of future stable cathode materials for SIBs.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Krzysztof Kruczala, Susann Neubert, Kapil Dhaka, Dariusz Mitoraj, Petra Janosikova, Christiane Adler, Igor Krivtsov, Julia Patzsch, Jonathan Bloh, Johannes Biskupek, Ute Kaiser, Rosalie K. Hocking, Maytal Caspary Toroker, Radim Beranek
Summary: There is limited knowledge of the mechanism of photocatalytic enhancement in SAC-modified photocatalysts. This study reports highly active photocatalysts for the aerobic degradation of pollutants based on TiO2 modified with various SACs. The results provide valuable insights into the mechanistic diversity of different SACs and identify essential design guidelines for the future development of SAC-based photocatalysts with enhanced performance.
Article
Chemistry, Multidisciplinary
Yupeng Zhao, Dandan Gao, Johannes Biskupek, Ute Kaiser, Rongji Liu, Carsten Streb
Summary: The development of highly active and efficient catalysts based on earth-abundant elements is crucial for sustainable energy conversion technologies. This study successfully used a modified Keggin-type polyoxometalate as a precursor to chemically modify a zeolitic imidazolate framework, resulting in a composite catalyst with promising electrocatalytic performance in the oxygen evolution reaction. The synthetic approach used in this study could lead to the design of new highly reactive catalysts for targeted reactions.
RESULTS IN CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Matthias Hocker, Klaus Thonke, Yueliang Li, Johannes Biskupek, Ute Kaiser, Jan-Patrick Scholz, Tomas Hubacek, Oliver Rettig, Ferdinand Scholz
Summary: By using depth-resolved cathodoluminescence (CL) spectroscopy in combination with electron energy loss spectra (EELS), lateral and vertical inhomogeneities of Al(Ga)N-based quantum wells were successfully distinguished, and the origins of two different luminescence contributions were identified. The differentiation of two groups of quantum wells by depth-resolved CL was demonstrated through the comparison to EELS results.
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.
