Characterization of Metallic and Bimetallic Nanoparticles by Off-Axis Electron Holography

It is well known that at nanoscale, parameters such as size, shape and surface morphology play a fundamental role on the properties that materials exhibit. In metallic nanoparticles, an increase in reactivity is obtained when size is reduced. In the case of bimetallic nanoparticles, unique physical and chemical properties can be achieved when composition and shape are controlled [1]. Aberration corrected electron microscopy is an ideal technique to study nanoparticles, however the images obtained correspond to two dimensional projections of three dimensional objects, which correspond to a partial characterization.