Fig. 2. XRD crystallite structure of NPs and c-zac heterostructure: (a) the X-ray diffraction patterns of ZnO nanoparticles, and c-zac heterostructures, (b and c) the magnified views of uncalcined and calcined ZnO and calcined c-zac heterostructures. A copper oxide-independent peak was detected above the 15% dopant amount. The high-angle shift is associated with the dominant copper doping.
