Article
Geochemistry & Geophysics
Tong Zhou, Lingsen Meng, Ailin Zhang, Jean-Paul Ampuero
Summary: This study proposes a novel observational constraint on earthquake source size based on the decay rate of wavefield coherence across a seismic array. The results show that wavefield coherence decays faster for earthquakes of larger magnitudes. The source size can be estimated from the coherence decay rate, and the inferred source sizes are consistent with scaling relations intermediate between width-saturated L-models and quasi equi-dimensional rupture models. The study demonstrates the potential of utilizing waveform coherence to study earthquake source parameters.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Nanoscience & Nanotechnology
Yanhui Wang, Jianrong Gao, Lunhua He
Summary: Ni77Ga23 alloys were rapidly solidified and undercooled using glass fluxing treatment. The study indicates that rapid solidification leads to the formation of a disordered solid solution, and high undercoolings result in the formation of an equiaxed microstructure. Within the equiaxed grains, coherent cuboidal precipitates of Ni3Ga phase are dispersed, and HRTEM study reveals the presence of disordered nano-domains in the lattice of Ni3Ga phase.
SCRIPTA MATERIALIA
(2024)
Article
Multidisciplinary Sciences
Masayuki Hojo, Koichiro Tanaka
Summary: The study introduces a novel type of spontaneous parametric down-conversion process that simultaneously generates visible and infrared photon pairs in periodically poled stoichiometric lithium tantalite, providing broadband and tunable generation of infrared photon pairs for quantum infrared spectroscopy as an alternative light source.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
A. J. Santos, B. Lacroix, F. Maudet, F. Paumier, S. Hurand, C. Dupeyrat, V. J. Gomez, D. L. Huffaker, T. Girardeau, R. Garcia, F. M. Morales
Summary: This report provides an overview of the possibilities offered by applying various (S)TEM techniques for the study of nanostructured and porous photonic surfaces. Several working examples demonstrate the type of information that can be obtained, and advanced characterization techniques enable high-resolution imaging and spectroscopy at both microscopic and nanoscopic levels.
MATERIALS CHARACTERIZATION
(2022)
News Item
Optics
Peijun Tang, Ruikang K. Wang
Summary: An OCM system utilizing a 1700 nm broadband laser source allows for cellular level deep brain imaging, providing information on cytoarchitectural and myeloarchitectural features across cortical depth without the need for tissue slicing. CC - corpus callosum.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Physical
Piu Rajak, Regina Ciancio, Antonio Caretta, Simone Laterza, Richa Bhardwaj, Matteo Jugovac, Marco Malvestuto, Paolo Moras, Roberto Flammini
Summary: We conducted a study on the sub-nanometer interlayer of crystalline silicon nitride at the Ni/Si interface, examining its role as a barrier against atom diffusion using transmission electron microscopy measurements and energy dispersive X-ray analysis. The results revealed that discontinuous silicide areas can be formed just below the nitride layer, with composition matching that of the nickel disilicide. This reaction between nickel and silicon is believed to be caused by thermal strain experienced by the interface during the deposition of nickel at low temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Lei Zhang, Minghao Shao, Zhehao Zhang, Xuening Yi, Jiwen Yan, Zelong Zhou, Dazhen Fang, Yongyong He, Yang Li
Summary: In this study, hollow cathode plasma source nitriding (HCPSN) was used to generate nitrided layers on the surfaces of Ti6Al4V titanium alloys, improving their corrosion resistance. The modified Ti-N nitriding layer, composed of TiN, Ti2N, and alpha-Ti (N) phases, showed enhanced corrosion resistance. This offers a broader prospect for applying Ti6Al4V titanium alloy in the medical field.
Article
Microscopy
Jacob Madsen, Timothy J. Pennycook, Toma Susi
Summary: This article discusses the importance of electron scattering simulations in materials science and structural biology and highlights the potential value and future trends of electron scattering simulations based on electrostatic potentials obtained from first principles.
Article
Biochemical Research Methods
Weihao Chen, Hui Wang
Summary: Optical coherence tomography (OCT) is a high-speed imaging technique that requires massive data processing and real-time displaying. Current OCT imaging software is predominantly based on C++, but the steep learning curve and manual memory management pose challenges. To address these limitations, OCTSharp is developed as an open-source OCT software based on the memory-safe language C#. It offers synchronized hardware control, minimal memory management, and GPU-based parallel processing. OCTSharp has been thoroughly tested and proven capable of supporting real-time image acquisition, processing, and visualization for various applications.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Acoustics
Quentin Leclere, Alice Dinsenmeyer, Jerome Antoni, Emmanuel Julliard, Azucena Pintado-Peno
Summary: The text discusses the principle and application scenarios of multiple coherence analysis tools, as well as the application of the TMC method in experiments. The study focuses on the significance of estimated coherence and how to effectively denoise signals.
Article
Optics
Manuel J. Marques, Ramona Cernat, Jason Ensher, Adrian Bradu, Adrian Podoleanu
Summary: This paper presents a different approach for processing interferometer signals driven by swept sources with non-linear tuning, evaluating the suitability of the Master-Slave (MS) procedure for such sources. The Master-Slave process is applied to intact interferogram spectrum delivered by an OCT system, allowing near-coherence-limited operation at a large axial range. Depth information can be recovered with some limitations in both cases.
Article
Chemistry, Physical
Kun'ichi Miyazawa, Takuro Nagai, Koji Kimoto, Masaru Yoshitake, Yumi Tanaka
Summary: The surface atomic structure of highly oriented pyrolytic graphite (HOPG) substrate exfoliated with adhesive tape was analyzed, revealing disordered and curved graphene layers on the exfoliated surface along with reactions with atmospheric water and oxygen molecules.
SURFACE AND INTERFACE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Yuefeng Wang, Jianguang Li, Qingfeng Wang, Tiansheng Wang
Summary: The rust layer structure of weathering steel was characterized in a simulated industrial atmosphere, revealing the presence of amorphous phase and nanograins. The distribution of Cr and Cu in the rust layer was found to be uneven, with Cu and Cr enriched in certain areas to promote the formation of specific phases.
Article
Chemistry, Physical
Amalia Navarro, Elisa Garcia-Tabares, Quentin M. Ramasse, Pablo Cano, Ignacio Rey-Stolle, Beatriz Galiana
Summary: Integration of GaP layers on silicon substrates using AsH3 pre-exposure followed by a PH3-based GaP epitaxial growth allows the development of very promising processes for the photovoltaic industry. However, many of the growth routines using this approach suffer from reproducibility issues, leading to poor quality layers. This lack of knowledge on the mechanisms behind the formation of common planar defects and their dynamics hinders the successful transfer of the method to new epitaxial systems.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Luis Francisco Villalobos, Shiqi Huang, Mostapha Dakhchoune, Guangwei He, Wan-Chi Lee, Kumar Varoon Agrawal
Summary: A novel strategy is proposed to fabricate a polymer film with transparent windows to address the issue of residues when observing nanoporous graphene using TEM. The polymer film is transformed into a carbon film with transparent windows, enabling residue-free transfer to the TEM grid without direct contact with the nanopores.
Article
Multidisciplinary Sciences
Jiajun Luo, Xiaoming Wang, Shunran Li, Jing Liu, Yueming Guo, Guangda Niu, Li Yao, Yuhao Fu, Liang Gao, Qingshun Dong, Chunyi Zhao, Meiying Leng, Fusheng Ma, Wenxi Liang, Liduo Wang, Shengye Jin, Junbo Han, Lijun Zhang, Joanne Etheridge, Jianbo Wang, Yanfa Yan, Edward H. Sargent, Jiang Tang
Article
Chemistry, Multidisciplinary
Troels Lindahl Christiansen, Espen D. Bojesen, Mikkel Juelsholt, Joanne Etheridge, Kirsten M. O. Jensen
Article
Multidisciplinary Sciences
Tian Miao, Lina Deng, Wenting Yang, Jinyang Ni, Changlin Zheng, Joanne Etheridge, Shasha Wang, Hao Liu, Hanxuan Lin, Yang Yu, Qian Shi, Peng Cai, Yinyan Zhu, Tieying Yang, Xingmin Zhang, Xingyu Gao, Chuanying Xi, Mingliang Tian, Xiaoshan Wu, Hongjun Xiang, Elbio Dagotto, Lifeng Yin, Jian Shen
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Nanoscience & Nanotechnology
Anders Gustafsson, Nian Jiang, Changlin Zheng, Joanne Etheridge, Qiang Gao, Hark Hoe Tan, Chennupati Jagadish, Jennifer Wong-Leung
Article
Multidisciplinary Sciences
Matus Krajnak, Joanne Etheridge
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Materials Science, Multidisciplinary
Wei Li, Benjia Zhu, Mathias Uller Rothmann, Amelia Liu, Weijian Chen, Yen Yee Choo, Narendra Pai, Wenxin Mao, Tian Zhang, Qiaoliang Bao, Xiaoming Wen, Udo Bach, Joanne Etheridge, Yi-Bing Cheng
Summary: The study demonstrates that halide segregation and I-V hysteresis in mixed halide inorganic CsPbIBr2 solar cells can be effectively mitigated by introducing an intermediate phase-enhanced Ostwald ripening through the control of chemical composition in the precursor solution. By adjusting the stoichiometric ratios of PbBr2 and CsI, improved solar cell performance can be achieved, with excess lead phase promoting Ostwald maturation and defect extinction. Ultimately, the CsPbIBr2 solar cell with a PbBr2-excess precursor composition achieves a high power conversion efficiency and external quantum efficiency.
SCIENCE CHINA-MATERIALS
(2021)
Article
Energy & Fuels
Wei Li, Mathias Uller Rothmann, Ye Zhu, Weijian Chen, Chenquan Yang, Yongbo Yuan, Yen Yee Choo, Xiaoming Wen, Yi-Bing Cheng, Udo Bach, Joanne Etheridge
Summary: The study shows that controlling intragrain defects can improve the performance of perovskite solar cells, and reducing the density of intragrain planar defects can enhance the device performance.
Article
Chemistry, Multidisciplinary
Mostafa Othman, Fei Zheng, Aaron Seeber, Anthony S. R. Chesman, Andrew D. Scully, Kenneth P. Ghiggino, Mei Gao, Joanne Etheridge, Dechan Angmo
Summary: A new method utilizing hot deposition technique to fabricate perovskite films has been reported, achieving high efficiency in roll-to-roll coated flexible solar cells. By improving the perovskite crystallinity and charge-transfer efficiency, a maximum efficiency of 12% was achieved.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Weilun Li, Wenming Tong, Anchal Yadav, Eva Bladt, Sara Bals, Alison M. Funston, Joanne Etheridge
Summary: The shape of metal nanocrystals is influenced by seed nucleation and growth environments, with surface energies and crystallinity affected by the choice of environments. By deliberately incorporating twin planes during post-seed growth, new final morphologies can be delivered, offering new routes for synthesizing different morphologies and facet orientations by breaking symmetry and introducing new facet orientations.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Qianying Guo, Tian Zhang, Wei Li, Weilun Li, Wen Liang Tan, David McMeekin, Zhou Xu, Xi-Ya Fang, Christopher R. McNeill, Joanne Etheridge, Udo Bach
Summary: By tuning the cation composition, CsPbIBr2 thin films with good crystallinity and textured morphology were obtained, and potassium incorporation was found to optimize the performance of inorganic lead halide perovskites.
ACS ENERGY LETTERS
(2022)
Article
Physics, Applied
Lifeng Xiang, Yang Shi, Wei Chao, Huanyu Zhang, Qiang Li, Wenjie Hu, Wenbin Wang, Hangwen Guo, Changlin Zheng, Joanne Etheridge, Lifeng Yin, Yinyan Zhu, Xiaodong Zhou, Jian Shen
Summary: For perovskite manganites, achieving low-field colossal magnetoresistance (CMR) is crucial. In this study, the magnetic field driven insulator-to-metal transition in La1-x-yPrxCayMnO3 is investigated using real space magnetic force microscopy (MFM). Three stages of the phase transition are observed, with distinct features in domain nucleation and growth. MFM reveals that domain growth requires a lower field than domain nucleation, providing critical information for achieving low-field CMR.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Wei Wen Wong, Naiyin Wang, Bryan D. D. Esser, Stephen A. A. Church, Li Li, Mark Lockrey, Igor Aharonovich, Patrick Parkinson, Joanne Etheridge, Chennupati Jagadish, Hark Hoe Tan
Summary: In this study, we utilize the selective area epitaxy method to deterministically engineer thousands of microring lasers on a single chip. By elucidating a detailed growth mechanism and controlling the adatom diffusion lengths, we achieve ultrasmooth cavity sidewalls. These engineered devices exhibit a tunable emission wavelength in the telecommunication O-band and show low-threshold lasing with high device efficacy across the chip. This work marks a significant milestone toward the implementation of a fully integrated III-V materials platform for next-generation high-density integrated photonic and optoelectronic circuits.
Article
Chemistry, Multidisciplinary
Brenton Cook, Philipp Reineck, Thomas Shiell, Jodie Bradby, Bryan D. Esser, Joanne Etheridge, Bianca Haberl, Reinhard Boehler, David R. Mckenzie, Dougal G. McCulloch
Summary: Diamond is a crucial material for biosensors, quantum computing, and space components due to its unique properties at the nanoscale. Researchers have successfully synthesized oriented, faceted diamond particles by flash laser heating of glassy carbon, and observed their microstructure and periodicity.
Article
Materials Science, Multidisciplinary
Weilun Li, Wenming Tong, Joanne Etheridge, Alison M. Funston
Summary: Shape and size control of metal nanocrystals is important for tuning their physicochemical properties. In this study, the growth mechanisms of gold nanocuboids and the influence of copper additives were investigated. The presence of copper additives led to asymmetrical growth and the formation of nanobars instead of nanocubes, accompanied by a reduction in particle size. This was attributed to a combination of rapid deposition on {111} facets and slow surface diffusion rate introduced by surface copper.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Tina A. Gschneidtner, Sarah Lerch, Erik Olsen, Xin Wen, Amelia Chi Ying Liu, Alicja Stolas, Joanne Etheridge, Eva Olsson, Kasper Moth-Poulsen
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.
