Figure 3

Optical microscope images of the cross sections of the AAO template with Cu nanowires. These are grown at various deposition temperatures: (a) -2.4°C; (b) -1.5°C; (c) 0.0°C; (d) 5.2°C; (e) 11.5°C; (f) 25.6°C; (g) 45.2°C; (h) 60.5°C. (i) and (j) show large-scale view of the cross sections at -2.4°C and 60.5°C, respectively. Yellow arrows indicate empty pores.