Details

Autor(en) / Beteiligte

• Mayoral, Alvaro
• Sanchez-Sanchez, Manuel
• Alfayate, Almudena
• Perez-Pariente, Joaquín
• Diaz, Isabel

Titel

Atomic Observations of Microporous Materials Highly Unstable under the Electron Beam: The Cases of Ti-Doped AlPO4-5 and Zn-MOF-74

Ist Teil von

• ChemCatChem, 2015-11, Vol.7 (22), p.3719-3724

Ort / Verlag

Weinheim: Blackwell Publishing Ltd

Erscheinungsjahr

2015

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• This work presents the highest resolution micrographs reported so far of two beam‐sensitive microporous materials: Ti‐doped AlPO4‐5 (TAPO‐5) and the metal–organic framework Zn–MOF‐74. They were registered by means of Cs‐corrected STEM. The high‐resolution images of the TAPO‐5 along the [0 0 1] orientation allows a clear observation of the aluminophosphate‐five (AFI) type framework, and illustrates the atomic distribution of the “T” atoms of the structure. However, no definitive conclusions about Ti substitution mechanism could be afforded because of the high symmetry of the AFI framework. In the case of Zn–MOF‐74, the images were also obtained at 300 kV proving that under certain conditions of beam current this technique can provide invaluable information of an ever‐increasing variety of molecular sieves. High resolution: Aberration‐corrected scanning transmission electron microscopy allows extracting atomic resolution data from the aluminophosphate AlPO4‐5 doped with Ti. Ultrahigh‐resolution images of Zn–MOF‐74 can be obtained by the same approach, opening up new possibilities for the analysis of highly beam‐sensitive materials.