Direct Imaging of ALD Deposited Pt Nanoclusters inside the Giant Pores of MIL‐101. (19th February 2016) - Meledina, Maria
Abstract : MIL‐101 giant‐pore metal‐organic framework (MOF) materials have been loaded with Pt nanoparticles using atomic layer deposition. The final structure has been investigated by aberration‐corrected annular dark‐field scanning transmission electron microscopy under strictly controlled low‐dose conditions. By combining the acquired experimental data with image simulations, the position of the small clusters within the individual pores of a metal‐organic framework has been determined. The embedding of the Pt nanoparticles is confirmed by electron tomography, which shows a distinct ordering of the highly uniform Pt nanoparticles. The results show that atomic layer deposition is particularly well‐suited for the deposition of individual nanoparticles inside MOF framework pores and that, upon proper regulation of the incident electron dose, annular dark‐field scanning transmission electron microscopy is a powerful tool for the characterization of this type of materials at a local scale. Abstract : Making use of gentle aberration‐corrected annular dark‐field scanning transmission electron microscopy, the loading of MIL‐101 giant‐pore metal‐organic framework materials with Pt nanoparticles by atomic layer deposition is investigated. By combining image simulations and electron tomography, the position of small clusters within the individual pores of a metal‐organic framework for the first time has been determined.