EEL spectroscopic tomography: Towards a new dimension in nanomaterials analysis
| Autor: | Sònia Estradé, Alberto Eljarrat, Maria Dolors Baró, Moisés Cabo, Marta Estrader, Lluís Yedra, Raul Arenal, Eva Pellicer, Francesca Peiró, Jordi Sort, Alberto López-Ortega |
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| Rok vydání: | 2012 |
| Předmět: |
Tomographic reconstruction
Materials science business.industry Nanotecnologia Tomografia Electron Signal Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Electron tomography Transmission electron microscopy Espectroscòpia de pèrdua d'energia d'electrons Nanotechnology Tomography Electron energy loss spectroscopy Spectroscopy business Instrumentation Energy (signal processing) |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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