Characterization of core–shell type nanoparticles in 3D by transmission electron microscopy (TEM) can be very challenging. Especially when both heavy and light elements coexist within the same nanostructure, artifacts in the 3D reconstruction are often present. A representative example would be a particle comprising an anisotropic metallic (Au) nanoparticle coated with a (mesoporous) silica shell. To obtain a reliable 3D characterization of such an object, a dose-efficient strategy is proposed to simultaneously acquire high-angle annular dark-field scanning TEM and annular dark-field tilt series for tomography. The 3D reconstruction is further improved by applying an advanced masking and interpolation approach to the acquired data. This new methodology enables us to obtain high-quality reconstructions from which also quantitative information can be extracted. This approach is broadly applicable to investigate hybrid core–shell materials.
Additional Metadata
Keywords ADF-STEM tomography, diffraction contrast, HAADF-STEM tomography, metal artifact reduction
THEME Energy (theme 4)
Publisher Wiley
Stakeholder Unspecified
Persistent URL dx.doi.org/10.1002/ppsc.201500097
Journal Particle & Particle Systems Characterization
Project Automated multi-modal tomography for sub-22nm IC nodes
Grant This work was funded by the The Netherlands Organisation for Scientific Research (NWO); grant id nwo/13314 - Automated multi-modal tomography for sub-22nm IC nodes
Citation
Sentosun, K, Sanz Ortiz, M.N, Batenburg, K.J, Liz-Marzán, L.M, & Bals, S. (2015). Combination of HAADF-STEM and ADF-STEM Tomography for Core–Shell Hybrid Materials. Particle & Particle Systems Characterization, 32(12), 1063–1067. doi:10.1002/ppsc.201500097