Figure 2: Characterization of nanostructured CuO and TNS-Cu meshes.

(a) SEM images of nanostructured CuO mesh after chemical oxidation using 5:10:3.75 proportion of NaOH/Na3PO4/NaClO2. (b) XRD pattern of nanostructured CuO mesh, which demonstrates that the components of nanostructured mesh are CuO and Cu, inset shows SEM image of nanostructured copper mesh. (c,d) SEM image of TNS-CuO-I and TNS-Cu-II with LBL assembly method and sputter-hydrothermal method, respectively. (e,f) XPS results of (c,d).