title: EEL spectroscopic tomography: towards a new dimension in nanomaterials analysis.
abstract: Electron tomography is a widely spread technique for recovering the three dimensional (3D) shape of nanostructured materials. Using a spectroscopic signal to achieve a reconstruction adds a fourth chemical dimension to the 3D structure. Up to date, energy filtering of the images in the transmission electron microscope (EFTEM) is the usual spectroscopic method even if most of the information in the spectrum is lost. Unlike EFTEM tomography, the use of electron energy-loss spectroscopy (EELS) spectrum images (SI) for tomographic reconstruction retains all chemical information, and the possibilities of this new approach still remain to be fully exploited. In this article we prove the feasibility of EEL spectroscopic tomography at low voltages (80 kV) and short acquisition times from data acquired using an aberration corrected instrument and data treatment by Multivariate Analysis (MVA), applied to Fe(x)Co((3-x))O(4)@Co(3)O(4) mesoporous materials. This approach provides a new scope into materials; the recovery of full EELS signal in 3D.
authors.affiliation: Laboratory of Electron Nanoscopies (LENS)-MIND/IN2UB, Dept. d'Electrònica, Universitat de Barcelona, c/ Martí Franquès 1, E-08028 Barcelona, Spain. llyedra@el.ub.es
authors.forename: Lluís
authors.initials: L
authors.lastname: Yedra
authors.forename: Alberto
authors.initials: A
authors.lastname: Eljarrat
authors.forename: Raúl
authors.initials: R
authors.lastname: Arenal
authors.forename: Eva
authors.initials: E
authors.lastname: Pellicer
authors.forename: Moisés
authors.initials: M
authors.lastname: Cabo
authors.forename: Alberto
authors.initials: A
authors.lastname: López-Ortega
authors.forename: Marta
authors.initials: M
authors.lastname: Estrader
authors.forename: Jordi
authors.initials: J
authors.lastname: Sort
authors.forename: Maria Dolors
authors.initials: MD
authors.lastname: Baró
authors.forename: Sònia
authors.initials: S
authors.lastname: Estradé
authors.forename: Francesca
authors.initials: F
authors.lastname: Peiró