The electronic properties of functional oxydes depends on the exact structural and electronic properties of their interfaces to other materials. We are using spatially resolved EELS in Scanning Transmission Electron Microscopes (STEM) to measure the structural and electronic properties, now at the atomic scale, of such interfaces. Our measurements are backed up with various theoretical analysis to eventually understand those properties.
Many nanomaterials have exciting properties and various applications. Many of their properties can be only understood by working on individual nanoparticles. We have a special interest in catalytic nanoparticles on the one hand, and graphene-like materials and nanotubes.
The optical properties of nanoobjects are drastically affected by their size and shapes. This is due to the confinement of either classical (plasmons) or quantum (exciton) waves which happens at scales much smaller than the typical wavelengths of light. In order to unveil and understand new optical properties of metallic or semi conducting quantum nanoparticles, we are using the unbeaten spatial resolution of electrons in a STEM and related (EELS and Cathodoluminescence spectroscopy).
All the researches above relies on cutting edge developments in instrumentation, data analysis, and computation. We have a long standing expertise in TEM instrumentation. This includes spectral imaging and EELS detection, and more recently high resolution cathodoluminescence spectroscopy (see also the dedicated site).
The group has developped specific data analysis including deconvolution techniques, multivariate techniques, and spectral imaging dedicated software suites. Furthermore, the group conducts a theoretical activity, mainly in the framework of density functional based techniques, focused on the modelling at a quantum level the structure of complex systems and the electronic response for core and valence excitations.