Host: Asst. Prof. David J. Masiello, Dept. of Chemistry
"Ultrafast Studies of Single Metal and Semiconductor Nanostructures"
Single particle spectroscopy is a powerful tool for studying nanomaterials. It is capable of revealing information about how differences in size, shape and environment affect properties – which is often hidden in ensemble measurements. In this talk results from transient absorption experiments performed with diffraction limited spatial resolution will be presented. These measurements allow single nano structures to be studied, and provide information about their dynamics that is washed out in ensemble experiments. The systems that have been investigated include metal nanowires and nanoplates, II-VI nanowires. and carbon nanotubes. The time scales range from a few hundred fs to a few ns. The results provide detailed information about how these materials interact with their environment, and trapping and recombination of electrons and holes in semiconductor nanostructures. Transient absorption images can also be collected, and provide information about the spatial variation of the dynamics, and how the charge carriers move in a nanostructure.