期刊
CHEMCATCHEM
卷 10, 期 13, 页码 2858-2867出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201800230
关键词
electron microscopy; nanomaterials; ptychography; synchrotron radiation; tomography
资金
- Bundesministerium fur Bildung und Forschung (BMBF) project MicTomoCat [05K16VK1]
Tomographic imaging of catalysts allows non-invasive investigation of structural features and chemical properties by combining large fields of view, high spatial resolution, and the ability to probe multiple length scales. Three complementary nanotomography techniques, (i)electron tomography, (ii)focused ion beamscanning electron microscopy, and (iii)synchrotron ptychographic X-ray computed tomography, were applied to render the 3D structure of monolithic nanoporous gold doped with ceria, a catalytically active material with hierarchical porosity on the nm and m scale. The resulting tomograms were used to directly measure volume fraction, surface area and pore size distribution, together with 3D pore network mapping. Each technique is critically assessed in terms of approximate spatial resolution, field of view, sample preparation and data processing requirements. Ptychographic X-ray computed tomography produced 3D electron density maps with isotropic spatial resolution of 23nm, the highest so far demonstrated for a catalyst material, and is highlighted as an emerging method with excellent potential in the field of catalysis.
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