Electron-phonon coupling dynamics in very small (between 2 and 8 nm diameter) Au nanoparticles
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670 (United States)
- Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556-5670 (United States)
Ultrafast laser experiments were used to study electron-phonon coupling in Au nanoparticles in the 2.5 to 8 nm size range in aqueous solution. The electron-phonon coupling constants for these samples were found to be independent of the particle size. This is attributed to a weak interaction between the electron gas and the surface phonon modes in Au. Calculations were performed which show that the coupling between the hot electrons and the surface accounts for less than 10% of the total electron energy losses for these particles. Thus, bulk electron-phonon coupling dominates the relaxation of excited electrons in Au particles, for particles as small as several hundred atoms. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20215719
- Journal Information:
- Journal of Chemical Physics, Vol. 112, Issue 13; Other Information: PBD: 1 Apr 2000; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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