Tunable Morphologies of Co~(2+)-Doped Zno/Znal_2o_4 Composite Films Derived from Co~(2+)-Substituted Layered Double Hydroxide Single Source Precursor

摘要

Co~(2+)-doped ZnO/ZnAl_2O_4 composite films have been prepared by facile calcination of a single-source Co~(II)Zn_(II)~Al~(III)-layered double hydroxide (Co~(II)Zn_(II)~Al~(III)-LDH) precursor. The preparation was performed initially by cast aqueous precursor slurry on quartz glass substrate and subsequent transformation to a network-like film via calcination. The surface morphology and composition of the resulting films were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and XPS analyses. The results clearly indicated that the as-deposited film is composed of Co~(2+)-doped ZnO and ZnAl_2O_4, and also large ZnO single crystals are homogeneously incorporated into small ZnAl_2O_4 particle matrix. The influence of Co~(2+)-doping concentration on microstructure and also on optical properties of the composite films was also investigated.