Ultra-high contrast STEM imaging for segmented/pixelated detectors by maximizing the signal-to-noise ratio

Ooe, Kousuke; Seki, Takahiko; Ikuhara, Yuichi; Shibata, Naoya

doi:10.1016/j.ultramic.2020.113133

Cited by 29 publications

(17 citation statements)

References 41 publications

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“…40 To gain more insight into the PK3 molecules in the ZSM-5 zeolites channels, we performed OBF-STEM, which has excellent capability to reveal the local structures of zeolites and visualize the confined molecules inside them at an atomic scale. 41 OBF-STEM images of Na-PK 0.01 -ZSM-5 (Fig. 5c and d) show that there are some white contrasts, which might be related to PK3 templates occluded in the 10-ring channels of ZSM-5.…”

Section: Resultsmentioning

confidence: 99%

“…Optimum bright-field (OBF) images are obtained by processing multiple images acquired by segmented/pixelated detectors through complex frequency filtering. 41 The relative crystallinities and phase purities of the as-prepared samples were determined by powder X-ray diffraction (XRD) on a Rigaku D-Max 2550 diffractometer (Rigaku, Japan) using Cu Kα radiation ( λ = 1.5418 Å). After the samples were degassed at 150 °C under vacuum, N 2 and Ar adsorption–desorption measurements were performed on a Micromeritics 2020 analyzer (Micromeritics, USA) at −196 °C and −186 °C respectively.…”

Section: Methodsmentioning

confidence: 99%

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An environment-friendly and acid-degradable polymer templated synthesis of single-crystal hierarchical zeolites

Yue

Wang

et al. 2022

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

An environment-friendly and acid-degradable polymer templated synthesis of single-crystal hierarchical zeolites

Yue

Wang

et al. 2022

J. Mater. Chem. A

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“…Understanding of these factors is critical to correctly interpreting and quantifying contrasts in DPC images. Ultrahigh-contrast STEM imaging via high-speed segmented/ pixelated detectors by optimum BF (OBF) STEM imaging mode may significantly reduce the electron dose without compromising image resolution (Ooe et al, 2021). Breakthrough developments in electron detectors, computers, and algorithms significantly advanced the practical realization of imaging technologies.…”

Section: Annular Bright-field (Abf) and Differential Phase-contrast Stem Imagingmentioning

confidence: 99%

Advances and Applications of Atomic-Resolution Scanning Transmission Electron Microscopy

Liu

2021

Microsc Microanal

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Although scanning transmission electron microscopy (STEM) images of individual heavy atoms were reported 50 years ago, the applications of atomic-resolution STEM imaging became wide spread only after the practical realization of aberration correctors on field-emission STEM/TEM instruments to form sub-Ångstrom electron probes. The innovative designs and advances of electron optical systems, the fundamental understanding of electron–specimen interaction processes, and the advances in detector technology all played a major role in achieving the goal of atomic-resolution STEM imaging of practical materials. It is clear that tremendous advances in computer technology and electronics, image acquisition and processing algorithms, image simulations, and precision machining synergistically made atomic-resolution STEM imaging routinely accessible. It is anticipated that further hardware/software development is needed to achieve three-dimensional atomic-resolution STEM imaging with single-atom chemical sensitivity, even for electron-beam-sensitive materials. Artificial intelligence, machine learning, and big-data science are expected to significantly enhance the impact of STEM and associated techniques on many research fields such as materials science and engineering, quantum and nanoscale science, physics and chemistry, and biology and medicine. This review focuses on advances of STEM imaging from the invention of the field-emission electron gun to the realization of aberration-corrected and monochromated atomic-resolution STEM and its broad applications.

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“…With the recent developments of detector technology, new imaging modes of TEM are emerging. For example, four-dimensional STEM (4D-STEM) 12 uses a fast pixelated detector to acquire the diffraction pattern during STEM acquisition, and a variety of reconstruction methods, such as differential phase contrast (DPC) imaging 13 – 16 , optimized bright-field imaging 17 , 18 , integrated DPC imaging 19 – 22 and ptychography 23 – 26 , can be used to reconstruct the image. In contrast to ADF-STEM that preferentially selects electrons that scatter to a large angle by TDS, 4D-STEM can employ the interference between weakly scattered electrons, and thereby greatly increase the dose efficiency.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of Cu in high-silica chabazite zeolite by electron ptychography using Wigner distribution deconvolution

Mitsuishi

Nakazawa

Sagawa

et al. 2023

Sci Rep

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Direct observation of Cu in Cu-chabazite (CHA) zeolite has been achieved by electron ptychography using the Wigner distribution deconvolution. The imaging properties of ptychographically reconstructed images were evaluated by comparing the intensities of six-membered-ring columns of the zeolite with and without Cu using simulated ptychography images. It was concluded that although false contrast may appear at Cu-free columns for some acquisition conditions, ptychography can discriminate columns with and without Cu. Experimental observation of CHA with and without Cu was performed. Images obtained from the Cu-containing sample showed contrast at the six-membered-rings, while no contrast was observed for the Cu-free sample. The results show that ptychography is a promising technique for visualizing the atomic structures of beam-sensitive materials.

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Ultra-high contrast STEM imaging for segmented/pixelated detectors by maximizing the signal-to-noise ratio

Cited by 29 publications

References 41 publications

An environment-friendly and acid-degradable polymer templated synthesis of single-crystal hierarchical zeolites

An environment-friendly and acid-degradable polymer templated synthesis of single-crystal hierarchical zeolites

Advances and Applications of Atomic-Resolution Scanning Transmission Electron Microscopy

Direct observation of Cu in high-silica chabazite zeolite by electron ptychography using Wigner distribution deconvolution

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