Figure 1.

(a) SEM and (b) TEM images of Cu NWs synthesized by the Ni(acac)₂ catalytic procedure. The ultra-long, super-fine and uniform NWs can be observed, which show an average diameter of 16.5 nm. (c) SAED pattern of an individual Cu NW (inset). Two sets of diffraction patterns show the five-fold twinned pentagonal structure of the Cu NW and indicate the growth along the [1–10] direction.