Figure 1
From: Metallic one-dimensional heterostructure for gas molecule sensing
Front view of the fully optimized structures of (a) Pd/Ge, (b) Pt/Ge, (c) Pd/Si and (d) Pt/Si core–shell NWs. The core is wrapped by 1ML Ge or Si-shell. Hydrogen atoms are passivated on the surface of the NWs to prevent the dangling bonds.
