A5009086399- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Physics of Superconductivity and Magnetism
- Advanced SAR Imaging Techniques
- Magnetic properties of thin films
- Laser-Plasma Interactions and Diagnostics
- Crystallography and Radiation Phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Superconducting and THz Device Technology
- Polymer composites and self-healing
- Terahertz technology and applications
- Astrophysical Phenomena and Observations
- Characterization and Applications of Magnetic Nanoparticles
- Advanced X-ray and CT Imaging
- Underwater Acoustics Research
- Advanced Materials Characterization Techniques
- Geophysical and Geoelectrical Methods
- Advanced Sensor and Energy Harvesting Materials
- Photonic and Optical Devices
- Optical measurement and interference techniques
Argonne National Laboratory
1994-2025
Dalian University of Technology
2025
Cornell University
2013-2023
Anhui Xinhua University
2020-2021
Helmholtz-Zentrum Hereon
2014-2019
Oregon State University
2019
University of Potsdam
2014-2018
New York University Press
2018
Cambridge University Press
2018
Philips (United Kingdom)
2018
A Complicated Scaffold, Simply Materials with tailored pore structures can be useful as catalysis supports and for lightweight materials. When preparing medical scaffolds, restrictive preparation conditions have to met, which prohibit multistep procedures. Sai et al. (p. 530 ) describe a method making porous polymers containing both relatively large (several microns) interconnecting pores second population of ∼ tens nanometer pores. The process exploits spinodal decomposition block copolymer...
Subangstrom resolution has long been limited to aberration-corrected electron microscopy, where it is a powerful tool for understanding the atomic structure and properties of matter. Here, we demonstrate ptychography in an uncorrected scanning transmission microscope (STEM) with deep subangstrom spatial down 0.44 angstroms, exceeding conventional tools rivaling their highest ptychographic resolutions. Our approach, which on twisted two-dimensional materials widely available commercial...
Further reduction of Pt in hydrogen fuel cells is hampered by reactant transport losses near the catalyst surface, especially for degraded catalysts. Strategically mitigating these performance requires an improved understanding nanostructure, which controls local and durability. We apply cryo-tomography a scanning transmission electron microscope (STEM) to quantify three-dimensional structure carbon-supported catalysts correlate their electrochemical accessibility. present results two carbon...
Abstract State-of-the-art halide perovskite solar cells have bandgaps larger than 1.45 eV, which restricts their potential for realizing the Shockley-Queisser limit. Previous search low-bandgap (1.2 to 1.4 eV) perovskites has resulted in several candidates, but all are hybrid organic-inorganic compositions, raising concern regarding device stability. Here we show promise of an inorganic (1.38 CsPb 0.6 Sn 0.4 I 3 stabilized via interface functionalization. Device efficiency up 13.37% is...
Abstract Both high resolution and precision are required to quantitatively determine the atomic structure of complex nanostructured materials. However, for conventional imaging methods in scanning transmission electron microscopy (STEM), with picometer cannot usually be achieved weakly-scattering samples or radiation-sensitive materials, such as 2D Here, we demonstrate low-dose, sub-angstrom using mixed-state ptychography. We show that correctly accounting partial coherence beam is a...
Nanoparticle electrodes in lithium-ion batteries have both near-surface and interior contributions to their redox capacity, each with distinct rate capabilities. Using combined electron microscopy, synchrotron X-ray methods ab initio calculations, we investigated the lithiation pathways that occur NiO electrodes. We find electroactive (Ni(2+) → Ni(0)) sites saturated very quickly, then encounter unexpected difficulty propagating phase transition into electrode (referred as a "shrinking-core"...
Motivated by the advanced photon source upgrade, a new hard X-ray microscope called "Velociprobe" has been recently designed and built for fast ptychographic imaging with high spatial resolution. We are addressing challenges of high-resolution scanning novel hardware designs, motion controls, data acquisition strategies, including use high-bandwidth interferometric measurements. The granite, air-bearing-supported stages provides necessary long travel ranges coarse to accommodate real samples...
Transmission electron microscopes use electrons with wavelengths of a few picometers, potentially capable imaging individual atoms in solids at resolution ultimately set by the intrinsic size an atom. Unfortunately, due to imperfections lenses and multiple scattering sample, image reached is 3 10 times worse. Here, inversely solving problem overcoming aberrations probe using ptychography recover linear phase response thick samples, we demonstrate instrumental blurring under 20 picometers....
The development of commercially friendly and stable catalysts for oxygen reduction reaction (ORR) is critical many energy conversion systems such as fuel cells metal–air batteries. Many Co-based perovskite oxides LaCoO3 have been discovered the active ORR catalysts, which can be good candidates to replace platinum (Pt). Although researchers tried substituting various transition metals into improve performance, influence substitution on mechanism rarely studied. In this paper, we explore...
The demand for high-throughput electron tomography is rapidly increasing in biological and material sciences. However, this 3D imaging technique computationally bottlenecked by alignment reconstruction which runs from hours to days. We demonstrate real-time with dynamic tomographic visualization enable rapid interpretation of specimen structure immediately as data collected on an microscope. Using geometrically complex chiral nanoparticles, we show volumetric can begin less than 10 minutes a...
Single-crystal Ni-rich Li[NixMnyCo1-x-y]O2 (SC-NMC) cathodes represent a promising approach to mitigate the cracking issue of conventional polycrystalline cathodes. However, many reported SC-NMC still suffer from unsatisfactory cycling stability, particularly under high charge cutoff voltage and/or elevated temperature. Herein, we report an ultraconformal and durable poly(3,4-ethylenedioxythiophene) (PEDOT) coating for using oxidative chemical vapor deposition (oCVD) technique, which...
Coherent imaging techniques provide an unparalleled multi-scale view of materials across scientific and technological fields, from structural to quantum devices, integrated circuits biological cells. Driven by the construction brighter sources high-rate detectors, coherent methods like ptychography are poised revolutionize nanoscale characterization. However, these advancements accompanied significant increase in data compute needs, which precludes real-time imaging, feedback decision-making...
Abstract X-ray ptychographic tomography is a nondestructive method for three dimensional (3D) imaging with nanometer-sized resolvable features. The size of the volume that can be imaged almost arbitrary, limited only by penetration depth and available scanning time. Here we present rapidly accelerates operation over given through acquiring set data via large angular reduction compensating resulting ill-posedness deeply learned priors. proposed 3D reconstruction “RAPID” relies initially on...
Measuring the three-dimensional (3D) distribution of chemistry in nanoscale matter is a longstanding challenge for metrological science. The inelastic scattering events required 3D chemical imaging are too rare, requiring high beam exposure that destroys specimen before an experiment completed. Even larger doses to achieve resolution. Thus, mapping has been unachievable except at lower resolution with most radiation-hard materials. Here, high-resolution achieved near or below one-nanometer Au-Fe
Magnetically controllable actuators, whose shape is independent of the applied magnetic field, can be physically re-programmed.
Abstract
Abstract Efforts to map atomic-scale chemistry at low doses with minimal noise using electron microscopes are fundamentally limited by inelastic interactions. Here, fused multi-modal microscopy offers high signal-to-noise ratio (SNR) recovery of material nano- and atomic-resolution coupling correlated information encoded within both elastic scattering (high-angle annular dark-field (HAADF)) spectroscopic signals (electron energy loss (EELS) or energy-dispersive x-ray (EDX)). By linking these...