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A New Methodology for Quantifying the Surface Crystallography of Particles from their Tomographic Reconstruction: Application to Pd Nanoparticles Embedded in a Mesoporous Silica Shell
Author(s) -
Baaziz Walid,
Valette Sébastien,
Gay AnneSophie,
Hirlimann Charles,
Ersen Ovidiu
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000275
Subject(s) - faceting , materials science , electron tomography , annealing (glass) , nanoparticle , transmission electron microscopy , palladium , mesoporous silica , mesoporous material , nanostructure , nanotechnology , crystallography , chemical engineering , scanning transmission electron microscopy , chemistry , composite material , catalysis , biochemistry , engineering
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@SiO 2 ) 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 (SiO 2 ) shells on the change in morphology and faceting of palladium nanoparticles during such annealing treatment.