Au 147 nanoparticles: Ordered or amorphous?
Résumé
Structural aspects of the Au147 cluster have been investigated through a density functional based
tight binding global optimization involving a parallel tempering molecular dynamics scheme with
quenching followed by geometries relaxation at the Density Functional Theory (DFT) level. The focus
is put on the competition between relaxed ordered regular geometries and disordered (or amorphous)
structures. The present work shows that Au147 amorphous geometries are relevant low energy candidates
and are likely to contribute in finite temperature dynamics and thermodynamics. The structure
of the amorphous-like isomers is discussed from the anisotropy parameters, the atomic coordinations,
the radial and pair distribution functions, the IR spectra, and the vibrational DOS. With respect to
the regular structures, the amorphous geometries are shown to be characterized by a larger number
of surface atoms, a less dense volume with reduced coordination number per atom, a propensity to
increase the dimension of flat facets at the surface, and a stronger anisotropy. Moreover, all amorphous
clusters have similar IR spectra, almost continuous with active frequencies over the whole spectral
range, while symmetric clusters are characterized by a few lines with large intensities.