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Probing the atomically diffuse interfaces in Pd@Pt core-shell nanoparticles in three dimensions.

Zezhou Li1,2, Zhiheng Xie1,2, Yao Zhang1,2

  • 1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China.

Nature Communications
|May 22, 2023
PubMed
Summary
This summary is machine-generated.

Researchers used atomic electron tomography to reveal diffuse, atom-thick interfaces in palladium-platinum core-shell nanoparticles. This diffuse interface, not sharp, impacts nanomaterial properties and offers new strategies for material design.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Understanding solid-solid interfaces in core-shell nanomaterials is crucial for their catalytic, optical, and electronic properties.
  • Atomic-level structural characterization of these interfaces is essential for precise nanomaterial design and property tuning.

Purpose of the Study:

  • To determine the three-dimensional atomic structure of palladium-platinum (Pd-Pt) core-shell nanoparticle interfaces.
  • To investigate the nature of the interface (sharp vs. diffuse) and its atomic-scale composition.
  • To correlate interface structure with potential implications for nanomaterial properties and manipulation.

Main Methods:

  • Atomic resolution electron tomography was employed to probe the 3D atomic structures of Pd-Pt core-shell nanoparticles.
  • Cryogenic electron microscopy was used to visualize individual palladium and platinum atoms and sub-nanometer clusters.

Main Results:

  • The study revealed a rich structural variety in core-shell nanoparticles with heteroepitaxy in 3D at atomic resolution.
  • The core-shell interface was found to be atomically diffuse, with an average thickness of 4.2 Å, rather than atomically sharp.
  • A high concentration of palladium (Pd) was observed in the diffuse interface, attributed to dissolved Pd atoms from the seeds.

Conclusions:

  • The findings advance the fundamental understanding of core-shell nanostructures by characterizing their diffuse interfaces.
  • The diffuse interface structure provides insights into the behavior of atoms at the boundary between different materials.
  • This research offers potential strategies for precise nanomaterial manipulation and regulation of chemical properties.