Title :
Ultrafast dynamics of nonequilibrium electrons in hybrid metal/chemical nano-systems
Author :
Bauer, Christophe ; Girault, Hubert H.
Author_Institution :
Fac. des Sci. de Base, Ecole Polytech. Fed. de Lausanne, Switzerland
Abstract :
A hybrid metal/molecule nano-system has been prepared to explore the ultrafast behaviour of nonequilibrium electrons in heterogeneous low-dimensional media. As a model, gold nanoparticles with diameters of 1.7 to 9 nm wrapped in a shell of sulfate have been chosen to investigate the role of adsorbates on the dynamics of electron-electron and electron-phonon interaction processes by femtosecond pump-probe transient absorption and four-wave mixing spectroscopy. These hybrid metal/molecule nano-systems provide an example of dynamics of electron-electron and electron-phonon interactions either controlled by the size of the nano-system or the nature of chemical species adsorbed on metal surface.
Keywords :
adsorption; electron-electron interactions; electron-phonon interactions; gold; high-speed optical techniques; multiwave mixing; nanostructured materials; 1.7 to 9 nm; Au; adsorbates; electron interaction dynamics; electron-electron interaction; electron-phonon interaction; femtosecond spectroscopy; four-wave mixing spectroscopy; gold nanoparticles; heterogeneous low-dimensional media; hybrid nanosystems; metal surface; metal-chemical nanosystems; metal-molecule nanosystem; nonequilibrium electrons; pump-probe spectroscopy; sulfate shell; transient absorption spectroscopy; ultrafast dynamics; Absorption; Charge carrier processes; Chemicals; Electrons; Four-wave mixing; Gold; Nanoparticles; Nonhomogeneous media; Size control; Spectroscopy;
Conference_Titel :
Quantum Electronics Conference, 2005. EQEC '05. European
Print_ISBN :
0-7803-8973-5
DOI :
10.1109/EQEC.2005.1567333
