Abstract
The structure and morphology of 1 to 3 nm size CoPt nanoparticles have been investigated in situ and in real time under different conditions: growth at or at room temperature (RT) followed by annealing at . The small-angle x-ray scattering measurements show size and temperature dependent growth mode with particle motions on the surface, while wide-angle scattering results, supported by Monte Carlo simulations, allow structure identification. If icosahedra are systematically detected at the first growth stages at RT, annealing at yields the decahedral structure from the quasistatic coalescence of icosahedral morphology. Meanwhile, growth at proceeds by a dynamical coalescence mechanism at the early stage, yielding truncated octahedral cubic structures.
- Received 12 November 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.115502
©2008 American Physical Society