nl8b03768_si_011.avi (2.54 MB)
Imaging Three-Dimensional Elemental Inhomogeneity in Pt–Ni Nanoparticles Using Spectroscopic Single Particle Reconstruction
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posted on 2019-01-25, 21:04 authored by Yi-Chi Wang, Thomas J. A. Slater, Gerard M. Leteba, Alan M. Roseman, Christopher P. Race, Neil P. Young, Angus I. Kirkland, Candace I. Lang, Sarah J. HaighThe
properties of nanoparticles are known to critically depend
on their local chemistry but characterizing three-dimensional (3D)
elemental segregation at the nanometer scale is highly challenging.
Scanning transmission electron microscope (STEM) tomographic imaging
is one of the few techniques able to measure local chemistry for inorganic
nanoparticles but conventional methodologies often fail due to the
high electron dose imparted. Here, we demonstrate realization of a
new spectroscopic single particle reconstruction approach built on
a method developed by structural biologists. We apply this technique
to the imaging of PtNi nanocatalysts and find new evidence of a complex
inhomogeneous alloying with a Pt-rich core, a Ni-rich hollow octahedral
intermediate shell and a Pt-rich rhombic dodecahedral skeleton framework
with less Pt at ⟨100⟩ vertices. The ability to gain
evidence of local surface enrichment that varies with the crystallographic
orientation of facets and vertices is expected to provide significant
insight toward the development of nanoparticles for sensing, medical
imaging, and catalysis.
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imaging Three-Dimensionalnanometer scalenanoparticlePt-rich corePt-rich rhombic dodecahedral skeleton frameworksurface enrichmentparticle reconstruction approachtechniqueverticetomographic imagingScanning transmission electron microscopeSpectroscopic Single Particle ReconstructionPtNi nanocatalystsgain evidenceelectron dose
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