Electron spectroscopies in the TEM for understanding nano structures and viceversa
Event details
| Date | 17.10.2016 |
| Hour | 13:15 › 14:15 |
| Speaker | Prof. Odile Stephan, Université Paris-Sud - France |
| Location | |
| Category | Conferences - Seminars |
Reducing the size of materials to induce new properties is at the core of nanoscience. New physical and chemical effects can emerge from an enhanced (even dominant sometime) contribution of surface or interfacial atoms possessing different electronic configuration than in the bulk, from the introduction of boundary effects inducing confinement effects of various origin (either classical or quantum) or due to low dimensionality. Probing such effects at the scale of individual nanostructures requires high spatial resolution characterisation techniques. Transmission electron microscopy, which allows combining structural property with optical and electronic property investigation down to nanometer or ultimately to atomic scale, is a most appropriate tool. In this talk, relying on recent advances in Electron Energy-Loss Spectroscopy (EELS) and nano-Cathodoluminescence (CL) in the Scanning Transmission Electron Microscope (STEM), I will explore 3 confinement mechanisms that play a dominant role in the properties of the nanostructures or nanotextured materials of interest. These are:
Bio: Odile Stéphan is a Professor of physics at University Paris-Sud and an honorary member of the Institut Universitaire de France. She is currently leading the STEM group at the Orsay Solid State Physics Laboratory. Her research interests span from growth mechanisms to optical and electronic properties of various nanostructures and nanomaterials. She focuses on the development and the use of Electron Energy-Loss Spectroscopy in a Transmission Electron Microscope and derived innovative spectroscopy techniques to probe at the nanometer scale the structural electronic and optical properties of original nanostructures like nanotubes and related nanostructures, nanophotonics objects, molecular magnets and to explore new physics phenomena at low dimensions (plasmon coupling, electron magnetic field confinement and exaltation). She has been awarded the Ancel Price of the Physical French Society in 2012 for her achievements in condensed matter physics.
- the occurrence of a 2D electron gas at interfaces of oxide heterostructures and its impact on metal to insulator transition mechanisms
- the classical confinement of the electromagnetic field associated with localized plasmons in metallic nanoparticles in connection with their optical properties
Bio: Odile Stéphan is a Professor of physics at University Paris-Sud and an honorary member of the Institut Universitaire de France. She is currently leading the STEM group at the Orsay Solid State Physics Laboratory. Her research interests span from growth mechanisms to optical and electronic properties of various nanostructures and nanomaterials. She focuses on the development and the use of Electron Energy-Loss Spectroscopy in a Transmission Electron Microscope and derived innovative spectroscopy techniques to probe at the nanometer scale the structural electronic and optical properties of original nanostructures like nanotubes and related nanostructures, nanophotonics objects, molecular magnets and to explore new physics phenomena at low dimensions (plasmon coupling, electron magnetic field confinement and exaltation). She has been awarded the Ancel Price of the Physical French Society in 2012 for her achievements in condensed matter physics.
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Practical information
- General public
- Free
Organizer
- Fabien Sorin & Michele Ceriotti
Contact
- Fabien Sorin & Michele Ceriotti