期刊
ULTRAMICROSCOPY
卷 233, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultramic.2021.113457
关键词
Quantitative scanning transmission electron; microscopy; Differential phase contrast; Segmented detectors; Image simulation; Graphene
类别
资金
- Australian Research Council [DP160102338]
- Australian Government Research Training Program Scholarship
- European Union [891504]
- JSPS KAKENHI [20K15014, 19H05788, 20H05659]
- JST PRESTO
- JST SENTAN Grant [JPMJSN14A1]
- Kazato Research Foundation
- Grants-in-Aid for Scientific Research [20K15014, 20H05659] Funding Source: KAKEN
- Marie Curie Actions (MSCA) [891504] Funding Source: Marie Curie Actions (MSCA)
This study compares experimental case studies with image simulations to determine the parameters that require precise characterization for reliable interpretation of reconstructed phases in quantitative differential phase contrast imaging. Coherent and incoherent lens aberrations are found to have the most significant impact, while noise and non-periodic boundary conditions have less of an effect.
Quantitative differential phase contrast imaging of materials in atomic-resolution scanning transmission electron microscopy using segmented detectors is limited by various factors, including coherent and incoherent aberrations, detector positioning and uniformity, and scan-distortion. By comparing experimental case studies of monolayer and few-layer graphene with image simulations, we explore which parameters require the most precise characterisation for reliable and quantitative interpretation of the reconstructed phases. Coherent and incoherent lens aberrations are found to have the most significant impact. For images over a large field of view, the impact of noise and non-periodic boundary conditions are appreciable, but in this case study have less of an impact than artefacts introduced by beam deflections coupling to beam scanning (imperfect tilt-shift purity).
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