A New Methodology for Quantifying the Surface Crystallography of Particles from their Tomographic Reconstruction: Application to Pd Nanoparticles Embedded in a Mesoporous Silica Shell. Issue 17 (20th July 2020)

• Record Type: Journal Article
• Authors: Baaziz, Walid; Valette, Sébastien; Gay, Anne‐Sophie; Hirlimann, Charles; Ersen, Ovidiu
• Is Part Of: ChemCatChem. Volume 12:Issue 17(2020)
• Page Start: 4422
• Page End: 4430
• Publication Date: 2020-07-20
• Subjects: electron tomography -- palladium nanoparticles -- core-shell -- surface crystallography -- catalysts; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202000275
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: In this work, we propose an experimental approach allowing for the identification and the subsequent quantification of nanoparticles crystallographic facets, based on 3D data obtained using Transmission Electron Microscopy (TEM). The particle shape and faceting can be determined using Electron Tomography (ET) combined with High‐Resolution TEM (HR‐TEM). The quantitative analysis of faceting is carried out on the particles 3D models using a geometrical approach that automatically detects planar regions on particle boundaries. In order to check the reliability of our approach, we analyzed palladium particles confined inside or located at the outer surface of a mesoporous silica shell (Pd@SiO2 ) after an annealing treatment at 250 °C under hydrogen for 12 hours. From the materials perspective, the aim of the current work is to investigate the encapsulation effect of silica (SiO2 ) shells on the change in morphology and faceting of palladium nanoparticles during such annealing treatment. Abstract : Faceting of nanopartices : We developed a geometrical approach allowing for the identification and subsequent quantification of nanoparticles crystallographic facets based on 3D data obtained by electron tomography. This approach which allows to automatically detects planar regions on particle boundaries and to assign them to crystallographic facets, was applied to palladium particles confined inside or located at the outer surface of a mesoporous silica shell. The influence of the encapsulation by silica on the morphological change of particles during an annealing treatment was investigated.