Fig. 4
Facet engineering by post-growth annealing technique. Top view SEM images showing (a) facet evolution of nanowires with {011} facets after annealing for 20 s. (b) facet evolution of nanowires with high index facets after annealing for 210 and 600 s. Note that the apparent elongation of the Au particle seen in top view in (a) ii, (b) ii and (b) iii is due to the Au particle titling (as shown in the side view inset of a ii) with respect to the growth direction during annealing and/or cooling down. All scale bars are 500 nm