INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Atomistic structure dependence of the collective excitation in metal nanoparticles
Autor/es:
CHRISTIAN F. A. NEGRE; CRISTIÁN G. SÁNCHEZ
Revista:
JOURNAL OF CHEMICAL PHYSICS
Editorial:
American Institute of Physics
Referencias:
Año: 2008 vol. 129 p. 34710 - 34717
ISSN:
0021-9606
Resumen:
From a simple time-dependent tight-binding model we calculate the absorption spectra of a series of metallic nanoparticles of varying size and shape. Spheres, spheroids of varying aspect ratio as well as a number of polyhedral particle shapes are studied. The frequency of the absorption maximum is found to scale linearly with the surface to volume ratio of the particle, with a slope and intercept which depends on particle shape, in particular, to the deviation from sphericity. In the case of spheroids the shift of the two different plasmon peaks which are observed are characterized as a function of the aspect ratio. The influence of shape is seen to be a determining factor for the frequency of the plasmon resonance. The influence of adatoms is studied. Linear relations between surface adatom concentration and the width of the spectral feature as well as the peak energy are observed.