Dynamic structure in supported Pt nanoclusters: Real-time density functional theory and X-ray spectroscopy simulations

作者：Vila F; Rehr J J^*; Kas J; Nuzzo R G; Frenkel A I

来源：Physical Review B, 2008, 78(12): 121404.

DOI：10.1103/PhysRevB.78.121404

The nature of local atomic and electronic structure at the nanoscale is of both fundamental and technological importance. For example, supported metal nanoclusters exhibit a number of unusual phenomena including large structural disorder and bond-length contraction with increasing temperature. We investigate this behavior for a prototypical ten atom Pt cluster supported on gamma alumina using temperature-dependent, real-time simulations based on density functional theory/molecular-dynamics and x-ray spectroscopy theory. The simulations reveal a complex dynamical structure on multiple-time scales including librational motion of the center of mass and fluctuating bonding characteristics, which explain many of the unusual properties.

• 出版日期2008-9