Single-shot 3D coherent diffractive imaging of core-shell nanoparticles with elemental specificity

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We report 3D coherent diffractive imaging (CDI) of Au/Pd core-shell nanoparticles with 6.1 nm spatial resolution with elemental specificity. We measured single-shot diffraction patterns of the nanoparticles using intense x-ray free electron laser pulses. By exploiting the curvature of the Ewald sphere and the symmetry of the nanoparticle, we reconstructed the 3D electron density of 34 core-shell structures from these diffraction patterns. To extract 3D structural information beyond the diffraction signal, we implemented a super-resolution technique by taking advantage of CDI's quantitative reconstruction capabilities. We used high-resolution model fitting to determine the Au core size and the Pd shell thickness to be 65.0 +/- 1.0 nm and 4.0 +/- 0.5 nm, respectively. We also identified the 3D elemental distribution inside the nanoparticles with an accuracy of 3%. To further examine the model fitting procedure, we simulated noisy diffraction patterns from a Au/Pd core-shell model and a solid Au model and confirmed the validity of the method. We anticipate this super-resolution CDI method can be generally used for quantitative 3D imaging of symmetrical nanostructures with elemental specificity.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-05
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.8, pp.8248

ISSN
2045-2322
DOI
10.1038/s41598-018-26182-1
URI
http://hdl.handle.net/10203/246182
Appears in Collection
PH-Journal Papers(저널논문)
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