Quantitative annular dark-field imaging of single-layer graphene-II: atomic-resolution image contrast

Microscopy
Shunsuke YamashitaKoji Kimoto

Abstract

We have investigated how accurately atomic-resolution annular dark-field (ADF) images match between experiments and simulations to conduct more reliable crystal structure analyses. Quantitative ADF imaging, in which the ADF intensity at each pixel represents the fraction of the incident probe current, allows us to perform direct comparisons with simulations without the use of fitting parameters. Although the conventional comparison suffers from experimental uncertainties such as an amorphous surface layer and specimen thickness, in this study we eliminated such uncertainties by using a single-layer graphene as a specimen. Furthermore, to reduce image distortion and shot noises in experimental images, multiple acquisitions with drift correction were performed, and the atomic ADF contrast was quantitatively acquired. To reproduce the experimental ADF contrast, we used three distribution functions as the effective source distribution in simulations. The optimum distribution function and its full-width at half-maximum were evaluated by measuring the residuals between the experimental and simulated images. It was found that the experimental images could be explained well by a linear combination of a Gaussian function and a Lorentzia...Continue Reading

References

Oct 16, 2010·Nano Letters·James M LeBeauSusanne Stemmer
Jul 17, 2012·Ultramicroscopy·Jo VerbeeckWouter Van den Broek
Nov 13, 2012·Ultramicroscopy·S D Findlay, J M LeBeau
Oct 31, 2013·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Ryo IshikawaStephen J Pennycook
Feb 1, 2015·Microscopy·Shunsuke YamashitaKoji Kimoto

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Citations

Mar 24, 2016·The Journal of Chemical Physics·Hassan S Al QahtaniTomonobu Nakayama
Apr 19, 2016·Scientific Reports·Shogo KoshiyaKoji Kimoto
Oct 16, 2016·Microscopy·Yoshifumi OshimaKunio Takayanagi
Aug 31, 2018·Advanced Materials·Xiaoxu ZhaoKian Ping Loh
Dec 17, 2019·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Douglas A Blom, Thomas Vogt
Aug 19, 2018·Scientific Reports·Shunsuke YamashitaKoji Kimoto
Oct 30, 2020·Physical Chemistry Chemical Physics : PCCP·Ikumi AkitaTetsu Yonezawa

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Methods Mentioned

BETA
electron microscopy
transmission electron microscopy

Software Mentioned

xHREM
DigiScan
DigitalMicrograph
CEOS
Titan

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