Temperature-dependent stability of supported five-fold twinned copper nanocrystals

摘要

The temperature-dependent structure transition of supported Cu nanocrystals on SrTiO_3(001)-(2 x 1) is investigated by scanning tunneling microscopy (STM). We experimentally determine the phase map of supported Cu icosahedral, decahedral, and truncated octahedral nanocrystal shapes as a function of substrate temperature during Cu deposition. We show that a supported nanocrystal of 8500 atoms at a nucleation temperature of 480°C has the same probability of adopting an icosahedral or octahedral shape.