Figure 2.

Powder XRD patterns for a) the colloidal Cu and CeO₂ nanocrystals, and b) the calcinated CeO₂ and 10CuO/CeO_{2− x} samples. Simulated diffraction patterns based on the crystal structures of bulk CeO₂, Cu, Cu₂O, and CuO are provided for comparison.^{[ 26} , ²⁷ , ^{28 ]}