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

fYear

2005

fDate

12-17 June 2005

Firstpage

162

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference, 2005. EQEC '05. European

Print_ISBN

0-7803-8973-5

Type

conf

DOI

10.1109/EQEC.2005.1567333

Filename

1567333