Dark field microscopy ≈ Dark field microscopy
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Physical characterization of nanoparticle size and surface modification using particle scattering diffusometry Open
As the field of colloidal science continues to expand, tools for rapid and accurate physiochemical characterization of colloidal particles will become increasingly important. Here, we present Particle Scattering Diffusometry (PSD), a metho…
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Strain mapping of semiconductor specimens with nm-scale resolution in a transmission electron microscope Open
The last few years have seen a great deal of progress in the development of transmission electron microscopy based techniques for strain mapping. New techniques have appeared such as dark field electron holography and nanobeam diffraction …
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A New Label-Free Technique for Analysing Evaporation Induced Self-Assembly of Viral Nanoparticles Based on Enhanced Dark-Field Optical Imaging Open
Nanoparticle self-assembly is a complex phenomenon, the control of which is complicated by the lack of appropriate tools and techniques for monitoring the phenomenon with adequate resolution in real-time. In this work, a label-free techniq…
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Dark-field computed tomography reaches the human scale Open
Significance X-ray computed tomography (CT) is one of the most commonly used diagnostic three-dimensional imaging modalities today. Conventionally, this noninvasive technique generates contrast by measuring the X-ray attenuation properties…
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Imaging and Analytics on the Helium Ion Microscope Open
The helium ion microscope (HIM) has emerged as an instrument of choice for patterning, imaging and, more recently, analytics at the nanoscale. Here, we review secondary electron imaging on the HIM and the various methodologies and hardware…
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Hyperspectral-Enhanced Dark Field Microscopy for Single and Collective Nanoparticle Characterization in Biological Environments Open
We review how the hyperspectral dark field analysis gives us quantitative insights into the manner that different nanoscale materials interact with their environment and how this relationship is directly expressed in an optical readout. We…
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Direct observation of the thickness distribution of ultra thin AlO<sub><i>x</i></sub>barriers in Al/AlO<sub><i>x</i></sub>/Al Josephson junctions Open
We have directly measured the thickness distribution of the tunnel barriers in state-of-the-art Al/AlOx/Al tunnel junctions. From the distribution we can conclude that less than 10% of the junction area dominates the electron tunnelling. T…
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Hybrid plasmonic gap modes in metal film-coupled dimers and their physical origins revealed by polarization resolved dark field spectroscopy Open
Plasmonic gap modes sustained by metal film-coupled nanostructures have recently attracted extensive research attention due to flexible control over their spectral response and significantly enhanced field intensities at the particle-film …
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Beam tracking approach for single–shot retrieval of absorption, refraction, and dark–field signals with laboratory x–ray sources Open
We present the translation of the beam tracking approach for x–ray phase–contrast and dark–field imaging, recently demonstrated using synchrotron radiation, to a laboratory setup. A single absorbing mask is used before the sample, and a lo…
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Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles Open
Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties t…
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Complementary Imaging of Silver Nanoparticle Interactions with Green Algae: Dark-Field Microscopy, Electron Microscopy, and Nanoscale Secondary Ion Mass Spectrometry Open
Increasing consumer use of engineered nanomaterials has led to significantly increased efforts to understand their potential impact on the environment and living organisms. Currently, no individual technique can provide all the necessary i…
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The ESRF dark-field x-ray microscope at ID06 Open
We present an instrument for dark-field x-ray microscopy installed on beamline ID06 of the ESRF — the first of its kind. Dark-field x-ray microscopy uses full field illumination of the sample and provides three-dimensional (3D) mapping of …
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Single-particle scattering spectroscopy: fundamentals and applications Open
Metallic nanoparticles supporting a localized surface plasmon resonance have emerged as promising platforms for nanoscopic labels, sensors, and (photo-) catalysts. To use nanoparticles in these capacities, and to gain mechanistic insight i…
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Unscrambling Mixed Elements using High Angle Annular Dark Field Scanning Transmission Electron Microscopy Open
The development of new nanocrystals with outstanding physicochemical properties requires a full three-dimensional (3D) characterization at the atomic scale. For homogeneous nanocrystals, counting the number of atoms in each atomic column f…
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Mapping of individual dislocations with dark-field X-ray microscopy Open
This article presents an X-ray microscopy approach for mapping deeply embedded dislocations in three dimensions using a monochromatic beam with a low divergence. Magnified images are acquired by inserting an X-ray objective lens in the dif…
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Morphology of the ferritin iron core by aberration corrected scanning transmission electron microscopy Open
As the major iron storage protein, ferritin stores and releases iron for maintaining the balance of iron in fauna, flora, and bacteria. We present an investigation of the morphology and iron loading of ferritin (from equine spleen) using a…
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Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications Open
Bimetallic nanoparticles are of special interest for their potential applications for fuel cells, mainly for portable power applications. Among the bimetallic systems, Pt-Pd bimetallic nanoparticles have received great interest as they can…
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Analytical High-resolution Electron Microscopy Reveals Organ-specific Nanoceria Bioprocessing Open
This is the first utilization of advanced analytical electron microscopy methods, including high-resolution transmission electron microscopy, high-angle annular dark field scanning transmission electron microscopy, electron energy loss spe…
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Resolving 45-pm-separated Si–Si atomic columns with an aberration-corrected STEM Open
Si-Si atomic columns separated by 45 pm were successfully resolved with a 300-kV aberration-corrected scanning transmission electron microscope (STEM) equipped with a cold-field emission gun. Using a sufficiently small Gaussian effective s…
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Advanced electron crystallography through model-based imaging Open
The increasing need for precise determination of the atomic arrangement of non-periodic structures in materials design and the control of nanostructures explains the growing interest in quantitative transmission electron microscopy. The ai…
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Direct imaging of local atomic structures in zeolite using optimum bright-field scanning transmission electron microscopy Open
Zeolites are used in industries as catalysts, ion exchangers, and molecular sieves because of their unique porous atomic structures. However, direct observation of zeolitic local atomic structures via electron microscopy is difficult owing…
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Characterization of nanomaterials with transmission electron microscopy Open
The field of nanotechnology is about research and development on materials whose at least one dimension is in the range of 1 to 100 nanometers. In recent years, the research activity for developing nano-materials has grown exponentially ow…
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Studying GPI zones in Al-Zn-Mg alloys by 4D-STEM Open
A new methodology has been developed to study the fine details of GP zones in age-hardenable aluminium alloys. It is complementary to atomic resolution high-angle annular dark-field scanning transmission electron microscopy imaging, and co…
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Hard-X-Ray Directional Dark-Field Imaging Using the Speckle Scanning Technique Open
X-ray dark-field imaging can provide inaccessible and complementary information compared to conventional absorption contrast imaging. However, extraction of the dark-field signal is difficult, and sophisticated optics are often required. I…
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Nanoparticles and Single Atoms in Commercial Carbon-Supported Platinum-Group Metal Catalysts Open
Nanoparticles of platinum-group metals (PGM) on carbon supports are widely used as catalysts for a number of chemical and electrochemical conversions on laboratory and industrial scale. The newly emerging field of single-atom catalysis foc…
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Applying the Fokker--Planck equation to grating-based x-ray phase and\n dark-field imaging Open
X-ray imaging has conventionally relied upon attenuation to provide contrast.\nIn recent years, two complementary modalities have been added; phase contrast\nand dark-field x-ray imaging, capturing weakly attenuating and sub-pixel sample\n…
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Atomic Structure of Wurtzite CdSe (Core)/CdS (Giant Shell) Nanobullets Related to Epitaxy and Growth Open
Heteronanocrystals consisting of a CdSe core and a giant CdS shell have shown remarkable optical properties which are promising for applications in opto-electrical devices. Since these properties sensitively depend on the size and shape, a…
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Plasmon-induced light concentration enhanced imaging visibility as observed by a composite-field microscopy imaging system Open
The plasmon-induced light concentration (PILC) effect, which has been supposed to be responsible for lots of linear and nonlinear enhanced optical signals such as Raman and high-harmonic generation, is hard to directly observe. Herein, we …
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Probing Light Atoms at Subnanometer Resolution: Realization of Scanning Transmission Electron Microscope Holography Open
Atomic resolution imaging of light elements in electron-transparent materials has long been a challenge. Biomolecular materials, for example, are rapidly altered by incident electrons. We demonstrate a scanning transmission electron micros…
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Light-Induced Coalescence of Plasmonic Dimers and Clusters Open
The properties of nanoplasmonic structures depend strongly on their geometry, creating the need for high-precision control and characterization. Here, by exploiting the low activation energy of gold atoms on nanoparticle surfaces, we show …