Figure 1From: Efficient piezoelectric ZnO nanogenerators based on Au-coated silica sphere array electrodeSchematic diagram for fabrication procedure. Schematic diagram for the fabrication of the Au-coated silica sphere array as a top electrode of ZnO NRA-based NGs: (i) preparation of colloidal solution (i.e., dispersed by silica spheres) on the PET substrate, (ii) rolling and drying the colloidal solution, and (iii) e-beam evaporation of Au onto the silica sphere array.Back to article page