AVS 53rd International Symposium
    Nanometer-scale Science and Technology Thursday Sessions
       Session NS-ThP

Paper NS-ThP14
Self-Organized Growth of Magic Planar Ag Nanopucks

Thursday, November 16, 2006, 5:30 pm, Room 3rd Floor Lobby

Session: Nanoscale Science and Technology Poster Session
Presenter: Y.P. Chiu, Academia Sinica and National Sun Yat-Sen University, Taiwan
Authors: Y.P. Chiu, Academia Sinica and National Sun Yat-Sen University, Taiwan
Y.S. Ou, Academia Sinica and National Taiwan University
Y.R. Chang, Academia Sinica and National Taiwan University
C.M. Wei, Academia Sinica, Taiwan
C.S. Chang, Academia Sinica, Taiwan
T.T. Tsong, Academia Sinica, Taiwan
Correspondent: Click to Email
Detailed calculations based on ab initio density functional theory have been made to study the formation of two-dimensional metal nanostructures. An analysis with metal nanostructures arranged in different shapes for a chosen size has been made to investigate how the size and shape effects related to electronic confinement influence the stability. Furthermore, based on the calculations of the second differences in total energy, it is shown that for Ag and Au two-dimensional geometries can exist in free space. In the report, the noble self-organized growth of magic planar Ag nanopucks on Pb islands has been observed in experiment by STM. According to the binding energy per atom as function of the nanopuck size, it clearly indicates that when the Ag nanopuck grows to a certain size, the geometrical effect takes hold from the electronic effect as the major attribute, which drives the Ag nanopucks towards well defined hexagonal crystalline structures. The transition takes place between around 30 and 60 atoms.