Determining the three-dimensional (3D) arrangement of atoms in crystalline nanoparticles is important for nanometre-scale device engineering and also for applications involving nanoparticles, such as optoelectronics or catalysis. A nanoparticle’s physical and chemical properties are controlled by its exact 3D morphology, structure and composition1. Electron tomography enables the recovery of the shape of a nanoparticle from a series of projection images2,3,4. Although atomic-resolution electron microscopy has been feasible for nearly four decades, neither electron tomography nor any other experimental technique has yet demonstrated atomic resolution in three dimensions. Here we report the 3D reconstruction of a complex crystalline nanoparticle at atomic resolution. To achieve this, we combined aberration-corrected scanning transmission electron microscopy5,6,7, statistical parameter estimation theory8,9 and discrete tomography10,11. Unlike conventional electron tomography, only two images of the target—a silver nanoparticle embedded in an aluminium matrix—are sufficient for the reconstruction when combined with available knowledge about the particle’s crystallographic structure. Additional projections confirm the reliability of the result. The results we present help close the gap between the atomic resolution achievable in two-dimensional electron micrographs and the coarser resolution that has hitherto been obtained by conventional electron tomography.
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Part of this work was performed at the National Center for Electron Microscopy (LBNL) which is supported by the Office of Science, Office of Basic Energy Sciences of the US Department of Energy under contract number DE-AC02-05CH11231. Financial support from the European Union for the Framework 6 programme under a contract for an Integrated Infrastructure Initiative (reference 026019 ESTEEM) is acknowledged.
The movie shows the computed 3D reconstruction of a Ag nanocluster showing the 3D position of all 784 atoms.
The movie shows the computed 3D reconstruction in which the Ag nanocluster is tilted from the  zone-axis toward , [41 1], [21 1] , and back.
The movie shows the computed 3D reconstruction in which the Ag nanocluster is tilted from the  zone-axis toward , [41 1], [21 1], and back. This movie includes a confidence estimate for each atom position. The radius of the bright shell around the atoms represents the confidence that can be associated with a particular atom. Absence of the shell represents high confidence, while a large shell represents high uncertainty.
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Seeing atomic-scale structural origins and foreseeing new pathways to improved thermoelectric materials
Materials Horizons (2019)