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The Structure of Sub-nm Platinum Clusters at Elevated Temperatures
- Source :
- Angewandte Chemie International Edition
- Publication Year :
- 2019
-
Abstract
- Little is known about metallic clusters consisting merely of a dozen of atoms or even less, despite of their importance in catalysis and crystal nucleation. Scanning transmission electron microscopy (STEM) provides direct atomic structure information but has inherently suffered from limited time resolution. We employ fast dynamic STEM combined with a spatio-temporal image denoising algorithm to explore the structure and stability of Pt clusters on carbon, which represents a highly relevant catalysis system. At room temperature, dynamic amorphous 2D structures are found, while above ≈300 °C, the clusters transform into a crystalline state. Our experimental and theoretical data reveal an unexpected strong trend of the crystalline clusters to exhibit the face-centered cubic, bulk structure of Pt with cuboidal geometries being most prominent.
- Subjects :
- Materials science
010405 organic chemistry
Nucleation
chemistry.chemical_element
General Chemistry
02 engineering and technology
General Medicine
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Catalysis
law.invention
Amorphous solid
0104 chemical sciences
Crystal
chemistry
Chemical physics
law
Scanning transmission electron microscopy
Electron microscope
Platinum
0210 nano-technology
Carbon
Subjects
Details
- ISSN :
- 15213773
- Volume :
- 59
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie (International ed. in English)
- Accession number :
- edsair.doi.dedup.....39d8a50022c3c1852751fb8e836f8d4b