Surface segregation of Au-Ag bimetallic nanowires

- The segregating behavior of Au-Ag nanowires is different from that of nanoparticles.
- Ag-rich surface, Au-rich subsurface and alloyed-core are the most thermodynamically favorable structure for Au-Ag nanowires.
- The surface Ag fraction depends on the cross-section of Au-Ag nanowires.
- Composition and temperature of NWs play a key role in surface Au atoms distributions.