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

Journal Article · · Scientific Reports
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  1. Univ. of California, Los Angeles, CA (United States)
  2. ShanghaiTech Univ. (China)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. RIKEN, Hyogo (Japan); Pohang Accelerator Lab. (PAL) (Korea, Republic of)
  5. RIKEN, Hyogo (Japan); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  6. National Univ. of Singapore (Singapore)
  7. Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  8. Japan Synchrotron Radiation Research Inst., Hyogo (Japan)
  9. RIKEN, Hyogo (Japan)
+ Show Author Affiliations

We report 3D coherent diffractive imaging (CDI) of Au/Pd core-shell nanoparticles with 6.1nm 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±1.0nm and 4.0±0.5nm, 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725; CNS-0821794
OSTI ID:
1565679
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS