IFIS - LITORAL   24734
INSTITUTO DE FISICA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Charla invitada: Ions and electrons in surface nanostructures, development and characterization.
Rio de Janeiro
Conferencia; 17th International Conference on Solid Films and Surfaces (ICSFS17); 2014
In this talk, based on a couple of examples, we will discuss the use of ion and electron energetic beams to generate and characterize surface nanostructures. The battery of surface characterization tools is complemented with non ion/electron bombardment based techniques like scanning tunneling microscopy (STM) and X-ray photoelectrons spectroscopy (XPS) as well as MonteCarlo (MC) and density functional theory (DFT) calculations in order to understand the system behaviour. The first case we will treat is the development of copper nitride (NCu) nanostructures on Cu(001) surface. By low energy (<5keV) N2 ions followed by mild annealing square, structures of copper nitride are formed over the surface. This is a pretty example of bottom up nanostructure developed through self assembling. We fully characterize this system from the initial diffusion features to the final state by means of Auger electron spectroscopy (AES), STM, XPS and Low Energy Ion Spectroscopy (LEIS). The second case we selected to show is an example of a top down growing surface structure. We study the electron bombardment reduction of aluminum belonging to an aluminum fluoride (AlF3) matrix. In this example we start with the study of the growing mechanism of this insulating film, by thermal evaporation over a Cu(001) surface, through STM and TEAS combined with MC and DFT calculation to understand the particular features, ending with the reduction process by means of electron bombardment and characterized by means of AES.