title: Three-dimensional chemistry of multiphase nanomaterials by energy-filtered transmission electron microscopy tomography.
abstract: A three-dimensional (3D) study of multiphase nanostructures by chemically selective electron tomography combining tomographic approach and energy-filtered imaging is reported. The implementation of this technique at the nanometer scale requires careful procedures for data acquisition, computing, and analysis. Based on the performances of modern transmission electron microscopy equipment and on developments in data processing, electron tomography in the energy-filtered imaging mode is shown to be a very appropriate analysis tool to provide 3D chemical maps at the nanoscale. Two examples highlight the usefulness of analytical electron tomography to investigate inhomogeneous 3D nanostructures, such as multiphase specimens or core-shell nanoparticles. The capability of discerning in a silica-alumina porous particle the two different components is illustrated. A quantitative analysis in the whole specimen and toward the pore surface is reported. This tool is shown to open new perspectives in catalysis by providing a way to characterize precisely 3D nanostructures from a chemical point of view.
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France.
authors.forename: Lucian
authors.initials: L
authors.lastname: Roiban
authors.forename: Loïc
authors.initials: L
authors.lastname: Sorbier
authors.forename: Christophe
authors.initials: C
authors.lastname: Pichon
authors.forename: Pascale
authors.initials: P
authors.lastname: Bayle-Guillemaud
authors.forename: Jacques
authors.initials: J
authors.lastname: Werckmann
authors.forename: Marc
authors.initials: M
authors.lastname: Drillon
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Ersen