Figure 1

XRD patterns and SEM, TEM, and HRTEM images. XRD patterns of Cu₂O and PtCu NCs (a). SEM image of the Cu₂O template (b) and PtCu NCs (c). TEM (d) and HRTEM (e, f) images of the PtCu NCs. The insets of (b) and (c) are the SEM images of single Cu₂O crystal and PtCu NC, respectively. The inset of (d) is the TEM image of a single PtCu NC. The insets of (e) and (f) are the SAED pattern and lattice fringes of PtCu NC, respectively.