Figure 2

(a-c) The bird's-eye view of SEM images of Au tube deposited on an ordered array of Si nanowires. The rectangle in (a) encloses a region which is magnified into (b), and the rectangle in (b) encloses a region which is magnified into (c). (d) EDX spectrum of an Au tube/Si nanowires sample. (e) HR-TEM image of an Au tube released from Si nanowire, and (inset of e) the [110] zone axis SAED pattern of the Au tube. The white lines indicate projection of atoms on (111) plane along [110] direction. (f) Applied potentials versus deposition times for the deposition in the dark (black line) and under room light illumination (gray line), respectively.