Electron-Phonon Scattering in 2D Silver Nanotriangles

Benoît Dacosta Fernandes (1) , Aurélie Le Beulze (2) , Fabien Moroté (1) , Jean Oberlé (1) , Mona Tréguer-Delapierre (2) , Julien Burgin (1) , Pierre Langot (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Electron-phonon energy exchanges are investigated in 2D silver nanotriangles of thickness ranging from 5 to 8 nm and lateral size ranging from 25 to 85 nm, using time-resolved femtosecond spectroscopy in the low-perturbation regime. The measured electron-phonon decay time is smaller in 2D nanotriangles than in bulk silver, and its value corresponds to the decay time measured in isolated nanospheres with a diameter equal to the thickness of the nanotriangles. These results show that the electron-phonon energy exchanges in 2D nanosystems are strongly accelerated by confinement and this acceleration is directly governed by the smallest dimension of the nano-object.

Domaines: Chimie théorique et/ou physique; Science des matériaux [cond-mat.mtrl-sci]

Benoît Dacosta Fernandes, Aurélie Le Beulze, Fabien Moroté, Jean Oberlé, Mona Tréguer-Delapierre, et al.. Electron-Phonon Scattering in 2D Silver Nanotriangles. Journal of Physical Chemistry C, 2013, 117 (42), pp.22041-22045. ⟨10.1021/jp406357p⟩. ⟨hal-00879092⟩